4,353 results on '"sandwich panel"'
Search Results
2. Out-of-plane shear performance of textile reinforced concrete sandwich panel: Numerical analysis and parametric study
- Author
-
Huang, Jun-Qi, Dan, Meng-Lin, Chong, Xun, Jiang, Qing, Feng, Yu-Long, and Wang, Yong-Wei
- Published
- 2025
- Full Text
- View/download PDF
3. Data-driven prediction method for flexural performance of ECC composite sandwich panels
- Author
-
Xiong, Feng, Bian, Yu, Liu, Ye, Ge, Qi, and Deng, Chubing
- Published
- 2024
- Full Text
- View/download PDF
4. Energy absorption of 3D-printed PETG and PETG/CF sandwich structures with cellular cores subjected to low-velocity impact: Experimental and numerical analysis
- Author
-
Mallek, H., Mellouli, H., Allouch, M., Wali, M., and Dammak, F.
- Published
- 2025
- Full Text
- View/download PDF
5. Free and random-vibration characteristics of sandwich panels featuring orthogonal accordion cores
- Author
-
Rong, Liu, Yifeng, Zhong, Yilin, Zhu, Haiwen, Cao, and Minfang, Chen
- Published
- 2025
- Full Text
- View/download PDF
6. Evaluation of heterogeneous core sandwich panels for energy efficiency and fire safety in warehouse buildings
- Author
-
Kim, Young Uk, Yang, Sungwoong, Wi, Seunghwan, and Kim, Sumin
- Published
- 2024
- Full Text
- View/download PDF
7. Comparative life cycle assessment of sprayed-UHPC sandwich panels over brick & block cavity construction
- Author
-
Al-Ameen, Eeman, Blanco, Ana, and Cavalaro, Sergio
- Published
- 2024
- Full Text
- View/download PDF
8. Precast concrete sandwich panels with recycled tire crumb rubber and expanded polystyrene foam cores under low‐velocity drop weight impact.
- Author
-
Hosan, Anwar, Basir, Abdul, Shaikh, Faiz Uddin Ahmed, and Chen, Wensu
- Subjects
- *
CRUMB rubber , *TIRE recycling , *CONCRETE panels , *CORE materials , *FAILURE mode & effects analysis , *SANDWICH construction (Materials) - Abstract
Structural behavior of precast concrete sandwich panels under low‐velocity drop weight impact is presented in this paper. Three types of concrete panels are considered namely, solid concrete panel (SCP), concrete sandwich panels containing recycled tire crumb rubber as core (CRSP), and expanded polystyrene foam as core (FSP). The panels are reinforced with steel mesh or steel fibers. A total of 12 panels are cast in this study. Six panels are reinforced using steel mesh, and the other six panels are reinforced using steel fibers. The impact test is carried out by dropping a weight from a varying height to input impact energy, which can cause various levels of damage for all specimens. The structural performance is discussed in detail, including failure modes, impact force, deflection, and strain. It is found that the core material greatly affects the structural response of the precast concrete panels. The sandwich panel containing recycled tire crumb rubber performed well in terms of rebounding force, permanent deflections, and damage behavior by partially absorbing the impact energy in both types of reinforced concrete panels. In CRSP and FSP, the maximum deflection to permanent deflection ratio rose from 1.19 in SCP to 2.67 and 2.01, respectively. A decrease of 70% in strain value from the first impact to permanent strain was recorded in CRSP when reinforced using conventional steel mesh. In comparison to its counterpart FSP, the CRSP exhibited a significantly smaller fracture width on the tension face as a result of the core's ability to dissipate impact energy, resulting in lower deflections and less damage to the panel. The CRSP reinforced with steel fibers demonstrated comparable performance to the counterpart FSP in terms of energy absorption and deflection reduction; however, it performed noticeably better than the SCP reinforced with steel fibers by reducing residual deflection by 51.8 mm. Consequently, recycled tire crumb rubber can be used as a sustainable alternative to traditional core materials in precast concrete panels. [ABSTRACT FROM AUTHOR]
- Published
- 2025
- Full Text
- View/download PDF
9. Edgewise compression mechanisms in sandwich panels with foam-core and jute/glass hybrid composite faces.
- Author
-
Dias, Thaís da Costa, Antonio Wink de Menezes, Eduardo, Tonatto, Maikson Luiz Passaia, and Amico, Sandro Campos
- Subjects
- *
HYBRID materials , *FINITE element method , *GLASS composites , *FAILURE analysis , *JUTE fiber , *SANDWICH construction (Materials) , *NATURAL fibers - Abstract
Natural fibers may represent an economical and sustainable alternative to produce sandwich panels. This study investigates the influence of the slenderness ratio on the buckling load of sandwich panels with jute, glass, and hybrid faces and a polyethylene terephthalate foam core. Failure and damage of the panel face with natural fibers are studied, also evaluating the suitability of failure criteria, especially considering the limited literature on that. Numerical analyses of the panels were performed using implicit and dynamic explicit solvers with Hashin's failure criteria. The hybrid faces showed a higher buckling load, being the most suitable option. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. Development of a Modular Sandwich Panel with a Composite Core of Recycled Material for Application in Sustainable Building.
- Author
-
Valenzuela Expósito, Juan José, Picazo Camilo, Elena, and Corpas Iglesias, Francisco Antonio
- Subjects
- *
MODULAR construction , *SUSTAINABLE buildings , *STRUCTURAL panels , *SUSTAINABILITY , *CORE materials - Abstract
In recent years, the construction industry has faced challenges related to rising material costs, labor shortages and environmental sustainability, resulting in an increased interest in modular construction cores composed of recycled materials, such as XPS, PUR, PLW and GFRP, from waste from the truck body industry. Two resins, PUR and polyester, were used to bond these recycled composites. Physical, chemical and mechanical analyses showed that the panels formed with PUR resin had superior workability due to the higher open time of the resin, 11.3% better thermal conductivity than the commercial PLW panel (SP-PLW) and reduced porosity compared to those using polyester resin. The mechanical performance of the panels improved with higher structural reinforcement content (PLW and GFRP). Compared to a commercial panel (SP-PLW), the SP-RCM1 recycled panel showed 4% higher performance, demonstrating its potential for sustainable building applications. Thermal and microscopic characterizations showed good adhesion of the materials in the best performing formulations related to higher thermal stability. Therefore, this research aims to demonstrate the feasibility of using waste from the car industry in the manufacture of sandwich panels for modular construction to address these issues. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Torsional behavior of composite shear walls and load‐bearing sandwich panels: An experimental investigation.
- Author
-
Alcan, Haluk Görkem and Aydın, Abdulkadir Cüneyt
- Subjects
- *
GLASS composites , *GLASS fibers , *SHEAR walls , *ENERGY dissipation , *FIBROUS composites , *SANDWICH construction (Materials) - Abstract
This study aims to experimentally investigate the torsional behavior of acrylic latex polymer and alkali‐resistant glass fiber‐reinforced composite shear walls and load‐bearing sandwich panels. Also, this study was aimed to experimentally examine the changes in the torsional moment capacities, twist angle values, energy dissipation capacities, ductility index, and rigidity of the samples for the presence of the additives added to concrete, size, presence of reinforcement in sandwich panels, and effect of sandwich panels. Within the scope of this work, a control sample, two composite shear walls, and two sandwich panels were produced (1500 × 1200 × 150 mm). While adding 5% acrylic latex to the concrete phase of one of the composite shear wall groups, in the other group, both 5% acrylic latex and 1% alkali‐resistant glass fibers were added to the concrete. While the core structure of the sandwich panel group is reinforced, the other group is produced without reinforcement. A total of 10 samples were loaded out of the plane and a torsional moment is created. As a result of the experiment, the torsional moment, twist angle, and energy dissipation capacities were increased for the samples with acrylic latex and alkali‐resistant glass fiber. While glass fibers increased the ductility index of the test samples, they decreased the stiffness value. Acrylic latex, on the other hand, does not have much effect on the ductility index and stiffness value and increased its energy dissipation capacity. Reinforced sandwich panel samples presented greater torsional moment capacities and stiffnesses compared to composite walls, and less ultimate twist angles and energy dissipation capacities. In addition, although the experimental results of the sandwich panels without reinforcement are lower than the other groups, these also showed load‐bearing capability under the effect of the torsional moment. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. Multi-objective optimization design of a circular core paper sandwich panel.
- Author
-
Jiang, Xiawang, Zhang, Shihao, Yu, Minggong, and Sun, Delin
- Subjects
- *
SANDWICH construction (Materials) , *FURNITURE manufacturing , *STRUCTURAL panels , *PARETO optimum , *COMPRESSIVE strength - Abstract
Ensuring sufficient mechanical performance while enabling lightweight design is critical for utilizing paper sandwich panels in the furniture industry. To design lightweight sandwich panels that balance mechanical properties and cost, this study developed a circular core paper sandwich panel (CCPSP) and investigated its structural efficiency using multi-objective optimization. The response surface method (RSM) based on Box–Behnken design was utilized to establish mathematical models relating the paper tube spacing, inner diameter, and height to the out-of-plane compressive strength, density, and cost. The resulting models effectively revealed the coupled effects of the parameters on the responses. Subsequently, the models were optimized using the non-dominated sorting genetic algorithm II (NSGA-II) to find the Pareto optimal trade-offs between maximizing compressive strength while minimizing its density and cost. The optimization solution resulted in an optimal set of paper tube geometries that maximized the structural efficiency of CCPSP. Overall, lower tube height conferred superior structural efficiency, while tube spacing and diameter were constrained. The results highlight the potential of CCPSP as an efficient and sustainable material for furniture manufacturing, enabled by multi-objective optimization of its structure. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
13. Effect of thin-wall copper on the mechanical properties of ultra-light 3D-printed polymeric sandwich panels.
- Author
-
Rohani Nejad, Salar, Hosseinpour, Mehrnoosh, and Mirbagheri, Seyed Mohammad Hossein
- Subjects
SANDWICH construction (Materials) ,COPPER ,COMPRESSIVE strength ,ENERGY density ,ELECTROFORMING - Abstract
In this study, a portion of an ultra-light polymeric sandwich panel was produced by additive manufacturing with a dimension of 25 × 25 × 37 mm as a precursor. Then, the precursor was covered with a thin-walled copper through electroforming deposition as a portion of a copper sandwich panel. The weight of the polymeric sandwich panel increased from 2–4 g to 9–13 g for the copper sandwich panel during the electroforming process. Compressive strength and energy absorption density of the polymeric and the copper sandwich panels with open-cell cores measured for 4, 5 and 6 PPI. The results shown that the ultra-light polymeric and copper sandwich panels with 6 PPI have the best mechanical performance in terms of yield stress, energy absorption density and energy absorption efficiency. Moreover, the abovementioned characteristics are 0.09 MPa, 0.11 MJ. m − 3 and 80% for the polymeric sandwich panels, and 1.74 MPa, 0.98 MJ. m − 3 and 70% for the copper sandwich panels, respectively. Therefore, the addition of 9.01 g copper as a reinforcing around the core's polymeric ligaments caused an increase in the yield stress for 20 times and in the energy absorption density for 9 times. Comparing to Ashby diagram, and previous studies, the sandwich panel portions of this study could develop the industry of sandwich panels by using the metallic shells as a reinforcement to ultralight polymeric sandwich structures. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
14. Simultaneous effects of different nanoparticles integrations on fiberglass sandwich panels under low-velocity impact.
- Author
-
Emamieh, Hamid Reza and Tooski, Mehdi Yar Mohammad
- Abstract
The incorporation of nanoparticles has been recognized as one of the methods of reinforcement of sandwich panels as an effective substitute for popular materials such as metals. This study has examined the low-velocity impact responses of two groups of nanocomposite sandwich panels at different energy levels. Clay-silica nanoparticles and nanoclay-carbon nanotube (CNT) were integrated as nanofillers into the face sheets of sandwich panels. The sandwich panel with glass fibers/epoxy face sheets and a PVC core was fabricated by the hand layup method. The Contact force-time and contact force-displacement curves were recorded at various energy levels of 15, 30, and 50 J. The simultaneous presence of nanoclay and CNT increased impact resistance by 43.2%, 19.8%, and 10.26% at energy levels of 15, 30, and 50 J, respectively, in comparison with the reference sample without nano-particle whereas the presence of nano-silica with nano-clay at some weight fractions weakened the impact resistance. The analysis of SEM images indicates the proper distribution of nanoparticles and the uniform distribution of CNT leading to the increase in impact properties, which are compatible with the mechanical results. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
15. Wölbkrafttorsion in exzentrisch beanspruchten Sandwichelementen.
- Author
-
Pradhan, Eric Man, Rädel, Felicitas, and Lange, Jörg
- Subjects
- *
SANDWICH construction (Materials) , *STRAINS & stresses (Mechanics) , *BENDING stresses , *CURTAIN walls , *FINITE element method - Abstract
Warping torsion in eccentrically loaded sandwich panels Currently, there is a growing interest in the application of sandwich panels subjected to both torsional and bending stresses. This is particularly relevant for façades when sandwich panels are equipped with photovoltaic panels or a supplementary curtain wall. Nevertheless, technical approval is currently dependent on the performance of sophisticated full‐scale tests, as a mechanically based or standardized calculation approach is not yet available for practical applications. This article provides a detailed analysis of the structural behavior of eccentrically loaded sandwich panels. A comprehensive series of experimental, numerical, and analytical studies were conducted on sandwich wall panels with a polyisocyanurate (PIR) core across a wide range of material‐specific and geometric parameters. The experimental data was employed to assess the validity and reliability of the finite element model and the analytical calculation model based on warping torsion. The core of the work is a parameter study based on this. The results prove the general applicability of warping torsion in sandwich panels within the specified limits and provide the foundation for a novel, practical approximation method for stress and deformation calculations. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
16. Modeling the Dynamic Properties of Multi-Layer Glass Fabric Sandwich Panels.
- Author
-
Charuk, Arkadiusz, Irska, Izabela, and Dunaj, Paweł
- Subjects
- *
SANDWICH construction (Materials) , *MODE shapes , *PHENOLIC resins , *FINITE element method , *MODAL analysis - Abstract
Sandwich panels are key components of many lightweight structures. They are often subjected to time-varying loads, which can cause various types of vibrations that adversely affect the functionality of the structure. That is why it is of such importance to predict the dynamic properties of both the panels and the structures made of them at the design stage. This paper presents finite element modeling of the dynamic properties (i.e., natural frequencies, mode shapes, and frequency response functions) of sandwich panels made of glass fabric impregnated with phenolic resin. The model reproducing the details of the panel structure was built using two-dimensional, quadrilateral, isoparametric plane elements. Afterwards, the model was subjected to an updating procedure based on experimentally determined frequency response functions. As a result, the average relative error for natural frequencies achieved numerically was 5.0%. Finally, a cabinet model consisting of the analyzed panels was built and experimentally verified. The relative error between the numerically and experimentally obtained natural frequencies was on average 5.9%. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
17. The Evaluation of Sandwich Composite Materials with Vegetable Fibers in a Castor Oil Polyurethane Matrix with Their Faces and Honeycomb Core Made in a 3D Printer.
- Author
-
Pino, Gilberto Garcia del, Bezazi, Abderrezak, Kieling, Antonio Claudio, Neto, José Costa de Macedo, Garcia, Sofia Dehaini, Rivera, José Luis Valin, Valin Fernández, Meylí, Torres, Aristides Rivera, and Valenzuela Diaz, Francisco Rolando
- Subjects
- *
SANDWICH construction (Materials) , *PLANT fibers , *CASTOR oil , *COMPOSITE materials , *BENDING stresses , *SISAL (Fiber) - Abstract
Sandwich panels are widely used in the naval and aerospace industries to withstand the normal tensile, compressive, and shear stresses associated with bending. The faces of sandwich composites are usually made of metals such as aluminum and, in some studies with composites, using a polymeric matrix, but there are no studies in the literature using a castor oil polyurethane matrix. The core of the panel must keep the faces apart and be rigid perpendicular to them. To begin the work, a study was carried out on the influence of alkaline treatment on sisal fibers to increase the fibers' adhesion to castor oil polyurethane. There are no relevant studies worldwide on the use of this resin and the adhesion of vegetable fibers to this polyurethane. In this work, a study was carried out through a three-point bending test of sandwich panels using faces of composite material with sisal fibers subjected to an alkaline treatment of 10% by weight of sodium hydroxide and an immersion time of 4 h in the dissolution, which was the best chemical treatment obtained initially in a castor oil polyurethane matrix. The honeycomb cores were made by 3D printer and in this study two different printing filament materials, PETG and PLA, and two different core heights were compared. As a result of a traction test, it was observed that sisal fibers with chemical treatment in a castor oil polyurethane matrix can be used in composites, although the stress levels obtained are 50% lower than the stresses obtained in other matrixes such as epoxy resin. The combination of sisal faces in a castor oil polyurethane matrix and honeycomb cores made in a 3D printer showed good properties, which allows the use of renewable, sustainable and less aggressive materials for the environment. In all tests, PETG was 21% to 32% stronger than PLA. Although there was no rupture in the test specimens, the PETG cores deformed 0.5% to 3.6% less than PLA. The composites with PLA were lighter, because the core density was 13.8% lower than the PETG cores. Increasing the height of the honeycomb increased its strength. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
18. Global buckling response of sandwich panels with additively manufactured lattice cores.
- Author
-
Osmanoglu, Serhat and Mittelstedt, Christian
- Subjects
- *
SANDWICH construction (Materials) , *FINITE element method , *SHEAR (Mechanics) , *HONEYCOMB structures - Abstract
This paper deals with the analytical and numerical global buckling analysis of rectangular sandwich plates utilized AlSi10 Mg in both facesheets and lattice cores. In this study, six different strut-based lattice core models are designed. Additionally, the buckling resistance of lattice panels is compared with a typical honeycomb panel. Analytical studies were carried out using Kirchoff plate theory (CLPT), first-order shear deformation theory (FSDT) coded on MATLAB and finite element (FE) analyses in Abaqus. In the theoretical approaches, the Navier solution is derived for sandwich plates with simply supported boundary conditions at all edges. In the FE analyses, validated homogenized lattice structures models were used to avoid excessive numbers of elements and to save computational time. The parametric effects of side-to-thickness ratio, and different designed core cells on global buckling responses are investigated. As a result of comparing the analytical results with the FE model, a good agreement is obtained, and it is found that analytical buckling analyses FSDT can be used within certain size limits for the global buckling analysis of lattice core sandwich structures. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
19. Mechanical Performance of Intralayer Hybrid 3D Woven Honeycomb Core for Lightweight Structural Composites.
- Author
-
Singh, Omender and Behera, B. K.
- Abstract
In weight-sensitive applications, the widespread use of honeycomb composites underscores the significance of enhancing their specific strength and energy absorption capacity. In this pursuit, various hybrid honeycomb structures have been developed, with a particular focus on their cell wall buckling behaviour. This study involved testing six different specimen types, incorporating intralayer hybridization with materials namely, Kevlar, Glass, Dyneema, Sisal, Hemp, and Jute. The incorporation of the intralayer hybrid technique examined various aspects of honeycomb structures, leading to improvements in mechanical performance. In addition, the effects of specific energy absorption and crush force efficiency on the compressive and flexural strength were investigated. Among all the samples, the honeycomb core with a height of 15 mm demonstrated the highest compressive strength and specific energy absorption values. This enhancement is attributed to the synergistic effects of intralayer hybridization, emphasizing the potential for utilizing natural alternatives such as sisal, hemp, and jute, which may offer pronounced advantages in impact stress propagation within hybrid composites. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
20. Efficient design of composite honeycomb sandwich panels under blast loading.
- Author
-
Sawant, Rashmi and Patel, Shivdayal
- Abstract
Hybrid composite honeycomb sandwich structures (HCHSS) were employed due to high specific strength and stiffness and higher impact resistance property required for the aerospace and defence fields. The numerical modelling of the efficient HCHSS was developed for the core, front and back face plate using the C3D8R elements to determine the realistic failure behaviour for the honeycomb sandwich structure. The ConWep blast simulation loading was applied for the HCHSS. Advanced composite materials were used for the blast analysis of the HCHSS (carbon/epoxy, graphite/epoxy, woven basalt fibres/polypropylene and woven Kevlar fibres/polypropylene). The damage initiation and damage propagation based progressive damage modelling was developed and implemented in the VUMAT code for composite materials to determine the actual failure behaviour of the HCHSS. The face sheets used in this model were of a stainless-steel alloy AL-6XN. The sandwich structure was subjected to blast loads of 1, 2 and 3 kg of TNT and their performance was compared w.r.t both front and back-face deflection. The effectiveness of sandwich panels was further examined by altering the thickness of the core. Fibre-metal laminates (FML) were used in place of the steel face sheets in the panel in order to minimise its mass, and a thorough analysis of the panel's mass in relation to its peak deflection was carried out. Upon analysing the results, it was noted that the panel with the basalt fibre reinforced polymer (BFRP) core gave the best results compared to other composite materials. For a blast load of 3 kg TNT, the peak back face deflection (PBFD) of HCHSS with a BFRP core decreased by 10.64%, 7.61% and 4.75%, respectively, compared to panels with CFRP, GFRP, and KFRP cores. The peak deflection of the panel decreased as the BFRP core thickness increased. The energy absorption capacity of the panel also increased with increasing thickness. Additionally, it was found that panels with BFRP cores and KFRP-steel laminate face sheets provided the optimum balance of strong blast resistant performance and light weight. Compared to the metallic (steel) sandwich panel, the mass of the sandwich panel with KFRP-steel laminate face sheets and BFRP core was reduced by 33%, but at the same time, its PBFD increased by almost 50%. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
21. Experimental and Numerical Investigation of the Effect of Embedding Steel Wires inside the Foam of GFRP/Foam Sandwich Panel under Three-Point Bending Load
- Author
-
Farzad Amiri, Mohammad Hossein Allaee, and Jafar Eskandari Jam
- Subjects
sandwich panel ,three-point bending ,steel wire ,gfrp ,foam ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
In this research, the effects of imbedding steel wires into the polyurethane foam of GFRP/Foam sandwich panel under three-point bending has been investigated. For this reason, three samples of non-reinforced, reinforced with two wires above and below and reinforced with three wires above and below the foam inside the GFRP sandwich panel were manufactured by vacuum bagging and tested under three-point bending in order to measure the specific strength of each sample. Moreover, a finite element model (FEM) was utilized using the Abaqus/Explicit package to further observe and analyze the stresses inside the samples. The results showed that imbedding steel wire inside the foam of the GFRP sandwich panel increased the bending strength by 25.2% in the two wire and 56.75% in the three-wire sample and bending modulus by 51.8% in two and 86% in three wire sample respectively. Since the weight of the wires with respect to the whole structure in negligible, the specific bending modulus of the sandwich panel was also improved by 21% in two and 44.8% in the three-wire sample. Finally, the results obtained from the experiments showed to have a decent agreement with the simulated model.
- Published
- 2024
- Full Text
- View/download PDF
22. Free vibration analysis of rotating sandwich panels with carbon nanotubes reinforced face sheets and honeycomb core in thermal environments using finite element method.
- Author
-
Biswas, Debarshi, Singha, Tripuresh Deb, and Bandyopadhyay, Tanmoy
- Abstract
The present work investigates the free vibration response of rotating sandwich panels comprising nanoparticle-reinforced face sheets and a metallic honeycomb core using the finite element method (FEM). The honeycomb core is either re-entrant or non-re-entrant, while the composite face sheets are made of poly-methyl methacrylate (PMMA) matrix reinforced by carbon nanotubes (CNTs). The deformations of the sandwich panel are modelled using a higher-order shear deformation theory (HSDT), considering seven degrees of freedom at each node. The effective properties of the CNTs reinforced face sheets depend on the working temperature and CNTs grading pattern and are evaluated with the help of the extended rule of mixture (EROM). The titanium alloy-based metallic honeycomb core properties depend on the inclination angle and rib-thickness ratio. The work considers the influence of crucial parameters like inclined angle, rib-thickness ratio, pre-twist angle, panel aspect ratio, core-to-face sheet thickness ratio, rotational speed and hub radius. A decrease in the natural frequency is observed with an increase in the honeycomb angle, while the reverse trend occurs with an increase in the rib-thickness ratio of the honeycomb core. An increase in the rotational speed and hub radius increases the natural frequencies irrespective of the CNTs distribution pattern. Also, the analysis involves plotting the mode shapes at different honeycomb angles. The first mode shape indicates the first bending for higher values of the auxetic angles, while it is the first twist mode at lower values. [ABSTRACT FROM AUTHOR]
- Published
- 2025
- Full Text
- View/download PDF
23. Research on sound insulation performance of the M-type folded core sandwich panel
- Author
-
YE Yurui and WANG Zhijin
- Subjects
sandwich panel ,m-type folded core sandwich panel ,cellular parameters ,sound insulation performance ,double-layer core ,laying method ,Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
As an advanced composite sandwich structure,the configuration of folded core is diverse,and previous research has mostly focused on the V-shaped folded core,while there is still relatively little research on the sound insulation performance of other configurations. A numerical model of a four sided simply supported M-shaped folded core sandwich panel under vertical incident sound pressure excitation is established,and the numerical simulation of its sound insulation performance based on finite element software is conducted. The theoretical predicted sound transmission loss curve of the honeycomb sandwich panel is compared with the simulation results. Based on simulation models,the sound insulation performance of M-type folded core sandwich panel structure is systematically studied,and the qualitative influence of geometric parameters of folded core cell on sound insulation performance is discussed. The influence of relative misalignment and laying angle of the upper and lower layers of M-type folded core sandwich panel with double-layer core on sound insulation performance is proposed and studied. The results show that the sound insulation performance is improved when the upper and lower layers of core are staggered and stacked in the Z-shaped line step direction of the cell,and it is better than single-layer folded core sandwich panel with the same surface density. When the relative laying angle of the upper and lower layers of core changes,the maximum weighted sound insulation reached the most value while the axis of the upper and lower layers of core is vertically laid.
- Published
- 2024
- Full Text
- View/download PDF
24. Bending Optimization of Composite Sandwich Panels with Second-Order Corrugated Cores
- Author
-
Mahdi Shaban, Sanaz Khoshlesan, and Mohammad sajad Shamsi monsef
- Subjects
design of experiments ,optimization ,sandwich panel ,second-order corrugated core ,stiffness ,Technology - Abstract
Second-order corrugated cores are one type of hierarchical cores that use the common corrugated cores as constituent elements for the main core. This paper attempts to identify and optimize the bending properties of composite sandwich panels with second-order corrugated core. To this end, both first- and second-order corrugated cores are constructed and force-displacement diagrams are extracted in three-point bending tests. Finite element models are created and the deflection results are validated by experiments. Based on the Taguchi method, various finite element models with different geometrical parameters are modeled and reaction force and stiffness are determined. Stiffness formulas for first- and second-order corrugated cores are determined by using regression analysis. The constrained-optimization results are determined to optimize the stiffness of sandwich panels with first- and second-order corrugated cores, separately. The global optimization problem is implemented to compare the first- and second-order configurations.
- Published
- 2024
25. Test methods for determination of shear properties of sandwich panels.
- Author
-
Silwal, Shekhar, Mela, Kristo, and Ma, Zhongcheng
- Subjects
- *
MODULUS of rigidity , *TRANSVERSE strength (Structural engineering) , *SHEAR strength , *TEST methods , *MINERAL wool , *SANDWICH construction (Materials) , *WALL panels - Abstract
This paper presents analysis and comparison of test methods for determining transverse shear strength and shear modulus of steel-faced sandwich panels commonly used in construction. The test methods are taken from the governing European standard EN 14509:2013. Two-point loading and four-point loading test methods as well as a full-scale test method are examined. Based on extensive experimental work on sandwich panels with varying core thickness, comprising mineral wool (MW) and polyisocyanurate (PIR) and encompassing both roof and wall panels, this study provides details of the test setup for the four-point loading and vacuum box methods with which a pure shear failure is obtained. Such details are missing from EN 14509. This paper highlights that the two-point loading method fails to consistently produce shear failure, especially in thicker panels, indicating it does not accurately measure transverse shear strength. The results of the experiments conducted in this study indicate that the four-point loading and full-scale test methods provide consistent shear failure for thicker panels while yielding greater transverse shear strength than the two-point loading test in general. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. Compressive and flexural responses of auxetic sandwich panels with modified re-entrant honeycomb cores.
- Author
-
Mohammadpour, Mojtaba and Taheri-Behrooz, Fathollah
- Subjects
- *
POISSON'S ratio , *SANDWICH construction (Materials) , *POLYLACTIC acid , *FRACTURE toughness , *BEND testing , *AUXETIC materials - Abstract
Auxetic structures possess negative Poisson's ratio (NPR). They exhibit enhanced indentation resistance, synclastic deformation, high fracture toughness and high energy absorption. Several sorts of auxetic structures exist, such as re-entrant, arrowhead, chiral, etc. The re-entrant structure is the most common sort of auxetic structures. This paper investigates the mechanical behavior of the re-entrant auxetic structure using experimental and numerical methods. Two modified re-entrant topologies are proposed based on the original (conventional) re-entrant topology. Using these modified topologies, two re-entrant auxetic sandwich structures are designed and 3D printed using fused deposition modeling (FDM) out of polylactic acid (PLA). Conducting compression, three and four-point bending tests, the compressive and flexural performance of the two new re-entrant auxetic sandwich structures is studied and compared with the original (conventional) re-entrant structure. More specifically, Poisson's ratio, compressive modulus, flexural stiffness and maximum loads of the structures are focused and studied. The mechanical properties of auxetic sandwich structures are improved using modified topologies. The new re-entrant auxetic sandwich structures show 11% higher normalized compressive modulus and 9% higher normalized flexural stiffness than the original re-entrant structure. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. S-çekirdekli sandviç panel kompozitin üç nokta eğme davranışları: Sonlu eleman modelleme ve deneysel incelemesi.
- Author
-
Öztemiz, Hasan Murat and Temiz, Şemsettin
- Abstract
Sandwich panel composites have a wide range of uses in material technology applications. The designed sandwich panel composite material; is made of stainless steel-316 as the top and bottom plate, aluminum 1050A-0 as the core material, and DP-8405 acrylic adhesive as the binding element. Three-point bending tests and finite element models investigated the bending behavior of S-core composite sandwich panels. Finite element models have been developed to characterize the effect of the bending behavior of composite elements on variations. The specific flexural modulus and strength of composite S-core sandwich structures can be compared with core structures in the literature. Accordingly, the minimum weight design provided a guideline for obtaining weight and density-efficient hybrid composite sandwich panels. When the damage loads in the test results were examined, it was concluded that the damage loads increased between 6.54% and 34.81% as the core thicknesses increased, and the damage loads decreased between 3.65% and 31.46% as the radius of curvature increased. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
28. DETERMINATION OF COMPOSITION AND DENSITY OF SANDWICH COMPOSITES PRODUCED BY VACUUM LAMINATION.
- Author
-
Rangel Velasco, David Coverdale, Freitas Baltazar, Thiago, Paes Viana, Lena Nunes, Vasconcellos Mothe, Alice, José Machado, Ocione, Ayres Leal, Gustavo, Duarte Lopes, Felipe Perisse, and Fontes Vieira, Carlos Mauricio
- Subjects
SANDWICH construction (Materials) ,LAMINATED materials ,REFERENCE values ,ENERGY consumption ,MANUFACTURING processes - Abstract
Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
29. Energy absorption properties of origami‐based re‐entrant honeycomb sandwich structures with CFRP subjected to low‐velocity impact.
- Author
-
Cui, Zhen, Duan, Yuechen, Qi, Jiaqi, Zhang, Feng, Li, Bowen, Liu, Mingyu, and Jin, Peng
- Subjects
- *
SANDWICH construction (Materials) , *HONEYCOMB structures , *FINITE element method , *LIGHTWEIGHT materials , *COMPOSITE structures - Abstract
Highlights This paper investigates a honeycomb sandwich structure that draws inspiration from the craft of origami. A specific folding pattern was applied to the honeycomb to create the origami‐based re‐entrant honeycomb (ORH), aimed at improving the energy absorption properties of the sandwich structure. The study on the energy absorption properties of structures under low‐velocity impact (LVI) utilized both experimental and numerical approaches. The energy absorption properties of the sandwich structure were examined by conducting LVI tests with different impact energy and then compared to the mechanical properties of the traditional re‐entrant honeycomb sandwich structures (TRHSS). Additionally, a refined finite element model has been established and its accuracy verified. Numerical studies were conducted to explore the effects of structural parameters on the energy absorption properties of ORH sandwich structure (ORHSS). The results show that the ORHSS exhibited a significant reduction in peak force when subjected to LVI, in contrast to the TRHSS. Furthermore, the ORHSS exhibit significant efficiency in energy absorption. Enhancing the wall thickness t$$ t $$ or folding angle V/H$$ V/H $$ can significantly improve the energy absorption properties of the ORHSS, thereby boosting the honeycomb's contribution to this process. This optimization results in an improved absorptive effect of the structure. The findings offer new recommendations for developing lightweight absorbent materials with potential applications across various industries. A novel composite sandwich structure serves as an efficient device for absorbing energy. This sandwich structure exhibits excellent cushioning and energy absorption capabilities. Changing geometric parameters can enhance the impact performance of the structure. A larger folding angle V/H$$ V/H $$ makes the core more prone to deformation. The greater the forward length V$$ V $$ of the ORH, the lower specific energy absorption (SEA) of the ORHSS. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
30. Low-Velocity Bird-Like Impact Behavior on Honeycomb Composite Structure.
- Author
-
ÖZTÜRK, Okan and ELALDI, Faruk
- Subjects
AEROSPACE engineering ,COMPOSITE materials ,DRONE aircraft ,KINETIC energy ,NUMERICAL analysis - Abstract
Copyright of Journal of Polytechnic is the property of Journal of Polytechnic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
31. Compression behavior of lightweight corrugated composite Sandwich panels with smart facesheets reinforced by shape memory alloy wires: an experimental study.
- Author
-
Rajabpour, M., Khalili, S. M. R., and Eslami‐Farsani, R.
- Subjects
- *
SHAPE memory alloys , *YOUNG'S modulus , *COMPRESSION loads , *LAMINATED materials , *DRILL core analysis , *SANDWICH construction (Materials) - Abstract
This paper presents an experimental examination of the compression demeanor of lightweight corrugated core composite (CCC) sandwich panel and corrugated core smart composites (CCSC) sandwich panels subjected to quasi‐static edgewise compression loading. The existence of shape memory alloy (SMA) wires and pre‐strain percentages of SMA are the indicators studied in this article. The fabrication procedure presented and the appraisement of the mechanical properties of the CCC and CCSC sandwich panels are expressed. The core geometry of samples is trapezoid corrugated made of aluminum. The facesheets are four layers of woven glass fiber/ epoxy laminated composite. For evaluation of the efficacy of the presence of SMA wires on mechanical specifications of sandwich panels, three SMA wires with various pre‐strain percentages (0%, 3%, and 6%) are embedded in each composite facesheet. Mechanical properties of all types of CCC and CCSC sandwich panels such as maximum force, critical damage force, specific strength, absorb energy, specific toughness, Young's modulus, and specific stiffness were evaluated. Results showed that the CCC sandwich panel has higher mechanical specifications than the CCSC sandwich panels with 0% and 3% pre‐strain. Also, increasing pre‐strained SMA wires improves all mechanical parameters of CCSC sandwich panels. CCSC sandwich panel with 6% pre‐strain has the highest compression properties than other sandwich panels. Maximum Force, Critical Damage Force, Specific Strength, Absorbed Energy, Specific Toughness, Young's Modulus, and Specific Stiffness of CCSC sandwich panel with 6% pre‐strain are 14.73 kN, 13.6 kN, 9.55 MPa/g, 26.61 kJ, 0.346 MJ/m3g, 4395 MPa and 0.61 kN/mm g, respectively. Highlights: Lightweight CCC sandwich panel and CCSC sandwich panel manufactured.Compression behavior of CCC sandwich panel and CCSC sandwich panel evaluated.Pre‐strained SMA wires improves energy absorption of CCSC sandwich panels.Higher specific toughness was obtained with 6% pre‐strain SMA.Presence of SMA wires with no pre‐strain cannot improve the specific strength. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. Design of multifunctional polymethacrylimide foam sandwich with excellent radar absorption capability and compressive performance.
- Author
-
Song, Shijun, Xiong, Chao, Yin, Junhui, Han, Chao, Zhao, Fang, Yang, Zhaoshu, and Liu, Lei
- Subjects
- *
PARTICLE swarm optimization , *RADAR , *STRUCTURAL components , *ABSORPTION , *FOAM , *ELECTROMAGNETIC wave absorption - Abstract
A composite multifunctional radar absorption polymethacrylimide (RAPMI) foam sandwich (MRAPS) was constructed. Analytical models for out-of-plane and in-plane compression of the MRAPS were established. Three-dimensional failure mechanism maps and specific strength cubic cloud maps were drawn. Finally, a multiobjective particle swarm optimization (MOPSO) algorithm was used to achieve an integrated design, and a specific calculation example was tested and verified through experiments. The resulting sandwich with a 43.0 mm thickness core and 0.13 g/cm3 density achieves 90% effective absorption above broadband (RL ≤ −10 dB) in the 2–18 GHz range. As a radar absorption absorber, the MRAPS increased the engineering value and strategic importance of PMI foam for structural components in the military and aerospace sectors. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
33. Thermal and mechanical properties of honeycomb sandwich panel of polyurethane nanocomposite reinforced with nanoclay.
- Author
-
Sajadian, Zahra, Zebarjad, Seyed Mojtaba, and Bonyani, Maryam
- Subjects
- *
DYNAMIC mechanical analysis , *HONEYCOMB structures , *URETHANE foam , *IMPACT testing , *SCANNING electron microscopy , *SANDWICH construction (Materials) - Abstract
This study investigated the thermal and mechanical properties of polyurethane foam (PUF) sandwich panels reinforced with varying amounts of clay nanoparticles (0, 0.5, 1 and 2 wt%) fabricated using the compression molding process. However, these composites were fixed to cores with a honeycomb structure. The morphology of PUF sandwich panels reinforced with clay nanoparticles was examined by scanning electron microscopy (SEM). The presence of clay nanoparticles in the honeycomb structure let to a reduction in cell size and an increase in the number of cells per unit volume. The impact of clay nanoparticles on the thermal properties of PUF reinforced with clay nanoparticles was investigated using thermogravimetric and dynamic mechanical thermal analysis (DMTA). The results indicated that the incorporation of clay nanoparticles as reinforcement enhanced the thermal properties of the PUF sandwich panel samples. Mechanical characterization technique including compression, three-point bending and drop weight impact tests displayed that the PUF reinforced with 1 wt% clay nanoparticles exhibited the most significant improvement in mechanical properties. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
34. Numerical Analysis of a Linear Quasi-Static and Vibrational Response of Gypsum Sandwich Panels Reinforced with Fiberglass Fabrics.
- Author
-
Wahrhaftig, A., Carvalho, R., and Brito, L.
- Subjects
- *
FINITE element method , *GEOMETRIC analysis , *STRESS-strain curves , *NONLINEAR analysis , *NUMERICAL analysis , *SANDWICH construction (Materials) - Abstract
To expand plaster utilization as a binder, mechanical behavior of sandwich panels consisting of two faces of plaster reinforced with fiberglass fabrics and a core of extruded polystyrene foam was studied. Using software based on the finite element method, computational models were utilized to simulate the four-point bending test. Two scenarios were examined: assuming a linear stress-strain curve for the material and employing nonlinear geometric analysis. These computational simulations allowed to determine loading limits and vertical displacements. After determining the flexural stiffness, the vibration response was calculated via an analytical procedure. This investigation proved that sandwich panels with greater thicknesses and volumes of reinforcements on the plaster faces exhibited greater load-bearing capacity, smaller displacements, greater resistance to traction and compression, and greater stiffness. Notably, panel 3, which had the thickness and volume content of reinforcement in the composite faces 24.71 and 66.67% higher, respectively, than reference panel, presented the best static and vibrational responses. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
35. Structural optimization of composite corrugated cores with variable stiffness.
- Author
-
Shamsi Monsef, Mohammad Sajad, Shaban, Mahdi, and Khoshlesan, Sanaz
- Subjects
- *
SANDWICH construction (Materials) , *FIBROUS composites , *STRUCTURAL optimization , *GENETIC algorithms , *COMPOSITE materials - Abstract
Outstanding progress in manufacturing technology of fiber-reinforced composite materials, allows designers to go beyond classical design rules. Composites with variable stiffness are an innovative division of composite materials that provide more efficient designs for engineers due to their diverse design parameters. In this study, a straightforward methodology is presented for the design of sandwich panels with corrugated variable stiffness core. Based on the homogenization method, a unit-cell of the sandwich panel is used as a representative volume element for the sandwich panel with corrugated core. Due to multiple design variables, conventional numerical and analytical methods cannot be applied to variable stiffness composites, thus PYTHON/ABAQUS framework is developed to determine the extensional and bending behavior of unit-cells. Details of this framework including PYTHON scripting and ABAQUS finite element solver are given along with their corresponding functions. Furthermore, the elitist genetic algorithm is incorporated into a framework for the optimum design of variable stiffness cores. Two optimization problems, namely composites with variable thickness and variable angle are considered for unit-cells, and associated constraints, boundary conditions, and fitness functions are discussed in detail. In addition to the benefits of the proposed framework, the obtained results reveal notable enhancement in the extensional and bending behavior of unit-cell. Results reveal that corresponding displacements are significantly improved (up to 80%) when using the optimum variable thickness case. For variable angle cases, the improvement of displacements is up to about 28%. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
36. Designing a Stiffener Layout that Resists the Wrinkling Behaviors of Sandwich Panels.
- Author
-
Wu, Zhen and Zhang, Senlin
- Subjects
- *
SANDWICH construction (Materials) , *STIFFNERS , *CHEBYSHEV polynomials , *FAILURE mode & effects analysis , *DEFORMATIONS (Mechanics) - Abstract
Wrinkling is a typical failure mode of sandwich structures with thin skins, where the bending deformation of face skins occurs simultaneously in conjunction with transverse stretching deformation of core layer. To analyze the three-dimensional (3D) deformation of wrinkling, a model is required to possess a capability describing completely different deformations at each ply. Therefore, by utilizing the Chebyshev polynomial at each layer of sandwich panels, this paper focuses on proposing a higher-order model to individually illustrate deformations of the skins and the core. By means of the proposed model, a refined triangular element has been constructed. By analyzing the stability of a sandwich plate without stiffeners, the finite-element formulation has been verified by comparing it to the quasi-3D elasticity solutions. In addition, it is anticipated that wrinkling failure can be effectively restrained by designing the stiffener layout. To this end, the influence of stiffener layouts on wrinkling behaviors of sandwich plates has been investigated in detail, and it is found that the capability of resisting the wrinkling deformation can be obviously improved by designing reasonable stiffener layouts. Moreover, the translation between buckling and wrinkling behaviors of sandwich panels with different stiffeners has been also explored, which can help to better understand wrinkling deformation mechanism. In summary, the proposed model can be used to design a reasonable arrangement of stiffeners to resist the wrinkling failure of sandwich panels. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
37. Laser forming of aluminium foam sandwich into a shock-absorbing structural part.
- Author
-
Changdar, Anirban, Shrivastava, Ankit, Chakraborty, Shitanshu Shekhar, and Dutta, Samik
- Abstract
The inefficacy of the conventional methods to form Aluminium Foam Sandwich (AFS) has led to the evolution of laser forming as an alternative. However, the current literature lacks studies that demonstrate the capability of the laser forming to form a targeted part out of AFS. The current study for the first time proposed a methodology and revealed salient factors relevant to laser forming an AFS panel into a prescribed scaled-down model (bumper beam). Estimation of the scan line position and the experimental methodology to obtain the desired process parameters against each scan line to obtain the targeted part are demonstrated. Chances of failure of the AFS part during the laser forming were investigated using finite element simulation. The laser-formed part that was finally obtained conformed well to the targeted shape and also exhibited improved flexural strength with no loss of local compressibility under the three-point bending test. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
38. Characterization of the mechanical energy absorption of honeycomb core sandwich panels filled with shear thickening fluid under low speed impact.
- Author
-
Astaraki, Sajjad, Zamani, Ehsan, Pol, Mohammad Hossein, and Hasannezhad, Hosein
- Abstract
The present research investigates the energy absorption of honeycomb core sandwich panels (HCSP) loaded with shear thickening fluid (STF) with different structural parameters at various impact velocities. The HCSP was aluminum, and the skin was constructed of different materials: (i) aluminum, (ii) glass-epoxy composite (GEC), and (iii) STF-impregnated fabric (STF/fabric) with a weight fraction of 15% silica particles. The experiment tests were carried out at 100 mm and 500 mm falling heights. Specific energy absorption HCSP/SF/S compared to HCSP/Al/S and HCSP/G/S increased by 6 47.49% and 23.04%, respectively. According to the results, the energy absorption of skin made of impregnated fabric is better than skin made of aluminum and composite. When the STF is under a high shear rate, the flow changes because of hydrocluster formation and changing the molecular structure from "order" to "disorder." These changes increase the viscosity notably, causing the STF to become a solid material, resulting in energy absorption. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
39. Experimental and numerical investigation of shear strain and failure in sandwich panels with foam-core and jute/glass composite faces under 3-point bending.
- Author
-
Dias, Thaís da Costa, Pigatto Ottoni, Tobias, Antonio Wink de Menezes, Eduardo, Tonatto, Maikson Luiz Passaia, and Amico, Sandro Campos
- Subjects
- *
HYBRID materials , *DIGITAL image correlation , *SHEAR strain , *GLASS composites , *FINITE element method , *SANDWICH construction (Materials) - Abstract
AbstractThere is a growing demand for natural fibers related to cost and environmental issues. This work focuses on the influence of the stacking sequence and hybridization on the shear strain of sandwich panels with glass/jute composite faces and polyethylene terephthalate foam core. Behavior comparison followed analytical, experimental, and numerical approaches. Failure analyses of the panels were performed numerically using the finite element method, with progressive damage and Hashin failure criterion. Digital image correlation was used to examine total surface deformation. Results showed that the hybrids presented better overall mechanical properties. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
40. Dynamic Characteristics of Composite Sandwich Panel with Triangular Chiral (Tri-Chi) Honeycomb under Random Vibration.
- Author
-
Yuan, Hui, Zhong, Yifeng, Tang, Yuxin, and Liu, Rong
- Subjects
- *
POISSON'S ratio , *RANDOM vibration , *FREE vibration , *HONEYCOMB structures , *FINITE element method - Abstract
A full triangular chiral (Tri-Chi) honeycomb, combining a honeycomb structure with triangular chiral configuration, notably impacts the Poisson's ratio (PR) and stiffness. To assess the random vibration properties of a composite sandwich panel with a Tri-Chi honeycomb core (CSP-TCH), a two-dimensional equivalent Reissner–Mindlin model (2D-ERM) was created using the variational asymptotic method. The precision of the 2D-ERM in free and random vibration analysis was confirmed through numerical simulations employing 3D finite element analysis, encompassing PSD curves and RMS responses. Furthermore, the effects of selecting the model class were quantified through dynamic numerical examples. Modal analysis revealed that the relative error of the first eight natural frequencies predicted by the 2D-ERM consistently remained below 7%, with the modal cloud demonstrating high reliability. The PSD curves and their RMS values closely aligned with 3D finite element results under various boundary conditions, with a maximum error below 5%. Key factors influencing the vibration characteristics included the ligament–rib angle of the core layer and layup modes of the composite facesheets, while the rib-to-ligament thickness ratio and the aspect ratio exert minimal influence. The impact of the ligament–rib angle on the vibration properties primarily stems from the significant shift in the core layer's Poisson's ratio, transitioning from negative to positive. These findings offer a rapid and precise approach for optimizing the vibration design of CSP-TCH. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
41. Dynamic response of GFRP/Nomex honeycomb sandwich panels subjected to multiple hail impacts – An experimental study.
- Author
-
Sun, Yigang, Xu, Zhenkun, and Deng, Yunfei
- Abstract
Nowadays, more and more aircraft components are made of composite sandwich structures, and ice impacts are prone to cause internal damage to composite sandwich structures, so it is crucial to study the impact of hail on composite sandwich structures. Since hail impacts may occur several times at a single point, an experimental approach was used to investigate the dynamic response of GFRP/Nomex honeycomb sandwich panels under multiple hail impacts. The dynamic response of the structure was investigated in terms of response rate and deflection‐profile curves using 3D digital image correlation methods, and the effects of impact energy, hail size, and number of impacts on the impact resistance of the honeycomb sandwich structure were explored. The results show that the dynamic response process of sandwich panels can be categorized into the ball‐and‐crown phase, the rebound phase, and the vibration phase. Under the same impact energy, the impact of small‐sized hailstones is more threatening to honeycomb sandwich panels. As the number of impacts increases, the maximum deflection value of the back panel first increases uniformly, and when the layered damage area reaches the threshold value, fiber stripping occurs, and the increment of the maximum deflection value increases significantly. Highlights: Since hail impacts may occur several times in real situations, this study conducted multiple impact experiments for one impact site. The dynamic response and damage pattern of the GFRP/Nomex honeycomb sandwich panels under multiple hail impacts were also investigated.The dynamic response process of GFRP/Nomex honeycomb sandwich panels was categorized into three phases: ball‐crown stage, rebound stage, and vibration stage.With the increase of the number of impacts, fiber stripping and fiber break damage began to occur when the layered damage area of the panel reached the threshold value. The honeycomb core has three main failure modes: cell wall folds, cell wall fracture, and cell wall debonding at the TGPW interface.Small‐diameter hails pose a more significant threat of damage to honeycomb sandwich panels at the same impact energy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
42. A Comparative Blast Mitigation Performance Evaluation of Metallic Sandwich Panels with Honeycomb, Corrugated, Auxetic, and Foam Cores.
- Author
-
Patel, Murlidhar and Patel, Shivdayal
- Subjects
- *
BLAST effect , *ALUMINUM foam , *AIR conditioning , *BENDING strength , *HONEYCOMB structures , *SANDWICH construction (Materials) - Abstract
Due to the high energy absorption capability and excellent bending strength of the sandwich panels, they are mostly preferred as protective structures against explosive blast attacks. The evaluation of their blast-mitigation characteristics through experiments is highly dangerous, costly, time-consuming, and polluting for the environment. Therefore, in this presented work, a series of numerical analyses were performed to evaluate the blast mitigation of the outstanding sandwich panels with honeycomb, corrugated, auxetic, and foam cores. The masses of sandwich panels were kept constant, and their areal densities were maintained constant throughout the study to effectively compare their performance under identical air blast loading conditions. To apply the air blast loads to the designed sandwiches, 1–3kg of spherical-shaped trinitrotoluene charges were used for a 100mm stand-off distance. The sandwiches are made of high-strength AL-6XN steel and crushable aluminum foam. The rate-dependent Johnson–Cook constitutive model of plasticity and the crushable foam model with volumetric hardening were used for the evaluation of sandwich panels’ plastic deformations. The findings of the work depicted that the honeycomb core is more efficient than the other core structures of the same masses because the sandwich panels with honeycomb core provide smaller back skin deflections, globalized core crushing, and higher core energy absorption than the other sandwich panels for extreme conditions of air blast loading. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. Application of Auxetic Core to Improve Dynamic Response of Sandwich Panels Under Low-Velocity Impact.
- Author
-
Biglari, Hasan, Teymouri, Hadi, and Foroutan, Mohammad
- Subjects
- *
SANDWICH construction (Materials) , *POISSON'S ratio , *SHEAR (Mechanics) , *IMPACT (Mechanics) - Abstract
Using high-order shear and normal deformation theory (HSNDT), this study analyzes the dynamic response and time history of the impact force of the sandwich plate with the auxetic core under low-velocity impact. The impact was modeled using a two-degree-of-freedom mass and spring model, and the Hertz linearized model was utilized to derive the contact force's time history. The rectangular sandwich panel has simple supported boundary conditions and consists of three layers: two aluminum top face sheets and one auxetic core layer with a negative Poisson's ratio. Using the energy technique, the system's governing equations are derived. The equilibrium equations were solved by the analytic approach of the Navier method in the space domain and the numerical method of Newmark in the time domain. The use of HSNDT distinguishes this article from others on similar topics, and the flexibility of the thick core in the thickness direction is considered. The Effects of different geometric and material properties have been investigated, and the results have been compared with those of other similar papers and studies for validation. The data indicate that the greater the degree of inclination of the cell, the longer the impact period and the lower the peak impact force. Moreover, the larger angle of the auxetic cell reduces the deflection at the impact site. In terms of minimizing deflection, the auxetic honeycomb sandwich panel is 25% superior to the non-auxetic honeycomb panel. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
44. Experimental and Numerical Assessment of Flatwise Compression Behaviors of Sandwich Panels: Comparison Between Aluminum, Innegra Fiber and Glass/Epoxy New Symmetric Lattice Cores.
- Author
-
Norouzi, H. and Mahmoodi, M.
- Subjects
- *
SANDWICH construction (Materials) , *GLASS fibers , *EPOXY resins , *ALUMINUM , *FINITE element method , *STRUCTURAL panels - Abstract
The sandwich panels are widely used in many industrial applications due to their high mechanical properties. Their core design is most important parameter in enhancing their mechanical strength. Flexibility in the design of the core structure leads to the achievement of high strength and light structures. In this paper, the results of the optimized geometry in the previous work are used to investigate the capability of the core geometry design with different materials. Therefore, using the different materials, the peak enhancement of strength-to-weight ratio in sandwich panels besides core behavior during pressure testing are investigated. To this end, a new lattice core is brought forth as the first level; then, three types of materials including AL3105, glass, and innegra fiber/epoxy composites are used to fabricate the cores, in order to compare the compressive strength and the peak. The Nano-clay cloisite 20A is also utilized in construction of sandwich panels. The result indicates that the AL3105 lattice core has the highest strength-to-weight ratio, while the innegra fiber composite core has the highest toughness. Applying curve studies and the SEM Fig. 13, it is concluded that the addition of Nano-clay to composites leads to an increase in both of the strain and the core strength. Comparing the results of experimental and finite element modeling (FEM) data (in ABAQUS software) represented that there is a suitable compliance between them. Our results with the positional variation in core design can pave way in designing advanced engineered sandwich structures in aerospace, shipping, automotive industries. Therefore, these structures will have wide applications in the field of light structure, heat and fluid transfer, sound and vibration control. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
45. Response of circular type sandwich panel using JUCO-glass fiber with PU foam under three-point bending loading
- Author
-
Md Shahriar Haque, Md Foisal Hossain, Muhammed Sohel Rana, and Md Shafiul Ferdous
- Subjects
Circular honeycomb core ,JUCO fiber ,Sandwich panel ,FEM ,PU foam ,Mechanics of engineering. Applied mechanics ,TA349-359 ,Technology - Abstract
In this study, a circular type honeycomb sandwich panel using natural JUCO and synthetic woven glass fiber was fabricated, and the bending properties like bending strength, modulus of rupture (MOR), and modulus of elasticity (MOE) were evaluated. Polyurethane (PU) foam was injected into the core structure to improve the bending strength. The orientation of jute and cotton fiber was varied to investigate the best stiffness and strength. In addition, twill-type JUCO fiber mat and synthetic woven glass fiber were also used to fabricate the circular type honeycomb sandwich panel. Finite element modeling was undertaken to validate the experimental results. Prior to the finite element analysis, a tensile test was carried out to determine the boundary conditions. Injecting polyurethane foam into the honeycomb core does not show any significant impact on bending properties. However, the deformation rate increased considerably by adding PU foam in the core structure. According to the results, honeycomb sandwich panels made of woven glass fiber with PU foam exhibited more homogenous deflection and bending compliance compared with others.
- Published
- 2024
- Full Text
- View/download PDF
46. The application of 3D printing technology in the design of sandwich panels
- Author
-
Ondřej Uher, Michal Král, Bohuslav Cabrnoch, and Josef Kruml
- Subjects
sandwich panel ,3D printing ,fused deposition modelling technology ,bonding ,pull-out test ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Composite materials including sandwich panels can offer a number of advantages such as excellent strength to mass ratio or stiffness to mass ratio. Sandwich panels can find their application in many industrial sectors where the mass and mechanical properties are critical. Despite these and many other advantages, the use of sandwich panels is associated with many problems, which stem from their structural composition (weak core with high shear stiffness connecting two skins with high in plane stiffness). This composition can cause problems in joining the sandwich panels to each other and to other parts by means of mechanical joints. To solve these problems, there exist many accessories such as inserts. The main objective of this paper is to present the development, manufacturing, and testing of plastic inserts for sandwich panels made by Fused Deposition Modelling 3D printing technology.
- Published
- 2024
- Full Text
- View/download PDF
47. Moisture ageing effects on the mechanical performance of eco-friendly sandwich panels made of aluminium skins, bamboo ring core and bio-based adhesives
- Author
-
Flávio Napolitano, Júlio Cesar dos Santos, Rodrigo José da Silva, Guilherme Germano Braga, José Ricardo Tarpani, Túlio Hallak Panzera, and Fabrizio Scarpa
- Subjects
Sandwich panel ,Sustainable structure ,Bamboo ,Mechanical properties ,Ageing effect ,Forestry ,SD1-669.5 - Abstract
Recent research has been focused on developing high-performance sandwich structures using renewable resources. The adoption of bamboo rings as a core material and bio-based adhesives has emerged as a promising sustainable design solution for panel construction. It is therefore critical to conduct accelerated ageing tests on these materials to evaluate the impact of environmental humidity on their degradation and durability. This study assessed the effects of moisture ageing on the physic-mechanical properties of eco-friendly sandwich panels and their constituents (aluminium skins, bamboo ring core and castor oil bio-adhesive). Mechanical evaluations of sandwich panels with compacted and spaced bamboo ring cores were performed under varying humidity conditions. Bamboo rings exhibited variable bulk density due to swelling and loss of organic material over time. They also demonstrated increased compressive properties after 2 years of natural ageing but reduced performance after 30 days at 100 % relative humidity. The mechanical properties of the bio-based polymer were enhanced through water-ageing exposure. Sandwich panels constructed with compacted bamboo ring cores exhibited higher bending properties than those with spaced ring core architecture, with the latter showing failures characterised by a wrinkling effect on both skins followed by debonding.
- Published
- 2024
- Full Text
- View/download PDF
48. The dynamic response of sandwich panels with cellular metal cores to localized impulsive loading
- Author
-
Jing, Lin, Wang, Zhihua, and Zhao, Longmao
- Published
- 2016
- Full Text
- View/download PDF
49. Controlled dynamic response of a novel auxetic sandwich structure: A tunable tetrachiral core with dual-FG nanocomposite skin
- Author
-
Mahapatra, Bibhu Prasad, Maiti, Dipak Kumar, and Jana, Prasun
- Published
- 2024
- Full Text
- View/download PDF
50. Investigation of mechanical behavior of Aluminum foam under uniaxial tests using Voronoi tessellation method
- Author
-
A. Rezaei Sameti
- Subjects
sandwich panel ,aluminum foam ,voronoi tessellation method ,atomistic simulation ,porous materials ,uniaxial tension test ,Building construction ,TH1-9745 - Abstract
Aluminum foams are among the materials that have many applications in the construction of various building elements, including sandwich panels. This category of materials has unique features due to low density, the presence of small holes, sound insulation, thermal insulation, and corrosion resistance. In this paper, the Voronoi tessellation method is proposed to simulate the porous configuration of aluminum foams, which has the high capability to generate a porous structure with different densities. It is demonstrated that the Voronoi tessellation method can generate porous structures with different densities, hole sizes, and wall thicknesses stably. Moreover, the Voronoi tessellation method has a high speed and can be used to construct different sizes of aluminum foams. A comparison of the configurations obtained from the Voronoi tessellation method and experimental tests demonstrates the capability and competence of this method in generating the porous structure of the aluminum foam. In order to investigate the mechanical behavior numerically, the uniaxial tension test is applied to the aluminum nanofoams using the molecular dynamics (MD) method. The MD analysis is performed in the LAMMPS open-access software using the embedded-atom model (EAM) interatomic potential. The periodic boundary condition is imposed in all the boundaries of the atomistic model to satisfy the essential condition of the representative volume element (RVE) based on the homogenization theory. After minimization and relaxation of RVE, the uniaxial tension test is applied in an increment manner to reduce the strain rate effect. The evolution of the stress-strain curve, along with the stress contours, are presented for the aluminum nanofoam during the uniaxial tension test. Young’s modulus of nanofoam obtained by numerical analysis is compared to that of experimental data to confirm the accuracy of the computational modeling. Moreover, the results emphasize the high dependence of the mechanical behavior of aluminum nanofoams on the density and porosity.
- Published
- 2024
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.