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Composite structures have been widely used in recent years in the aerospace industry as well as in industries that require lightweight structures due to their lightness and high strength-to-weight ratio. The purpose of this research is to introduce and compare a new type of sandwich panel to introduce structures that can be used in the aerospace industry. The cores in this research are made using Fused Deposition Modeling (FDM) with two types of PLA and ABS polymers. The face sheets used for this study are glass fiber reinforced composites and aluminum face sheets. In the first part of this study, a theoretical model for obtaining the force-displacement curve in nuclei with rectangular geometry was presented. Comparison of theoretical and experimental results showed that theoretical relationships have a good ability to predict the amount of force in experimental tests. The results obtained in this study showed that the use of composites made of epoxy glass fibers as a face sheet for sandwich panels leads to higher resistance to three-point bending. It was also found that sandwich panels made with ABS cores have higher strength compared to PLA cores, but their softness is less. [ABSTRACT FROM AUTHOR]

Parts produced using material extrusion (MEX), a common additive manufacturing method, are often limited to non-structural applications due to sub-optimal mechanical properties, including poor interlayer fracture toughness, Gc. Gc of MEX parts depends on process parameters, but the complex relationships between process parameters and Gc are not well understood. This paper describes the use of a machine learning (ML) method using Forests with Uncertainty Estimates for Learning Sequentially (FUELS) to study the effect of five process parameters on the Gc of MEX parts. Training data for the FUELS model is collected using a modified double cantilever beam (MDCB) test, and Gc is calculated using a classical beam theory approach. The FUELS method provides guided testing by suggesting additional parameter combinations from high-uncertainty regions of the parameter space. After sequentially testing a total of 2.9% of the 2205 possible parameter combinations, there was minimal change in the non-dimensional model error, and training was concluded. Gc values collected from testing ranged 0.056 kJ/m2 to 1.774 kJ/m2. The resulting parameter space was examined to better understand how Gc evolves with changing process parameters. Among other results, extrusion temperature was shown to have a greater effect on Gc at higher print speeds. Overall, the FUELS method, paired with accelerated experimental testing, provides a useful means of quickly exploring the large MEX parameter space to establish relationships among process parameters and Gc. The methods of this study can serve as a blueprint for other studies with large parameter spaces, not just in MEX but in other manufacturing processes. [ABSTRACT FROM AUTHOR]

In the present work, acrylonitrile-butadiene-styrene (ABS)/glass fiber (varying fiber orientation angle) and with different % of carbon black (CB) particles-based hybrid composites are fabricated by hot press compression molding technique. Prepared composites were examined under marine conditions in sea water medium and erosion behavior under erodent particles entrained in gas fluid and found reduced impact. Morphological studies are studied through scanning electron microscope. Material removal mechanism is found to be micro-cracking at the impingement angle of 90°. Additionally, numerical analysis for the composite material with respect to single particle impact for erosion was conducted using LS-DYNA. [ABSTRACT FROM AUTHOR]

The primary contributors to greenhouse gas (GHG) emissions in railway transport include the energy consumed during transportation, the materials used for infrastructure construction, and maintenance. Track structures commonly employ materials with a substantial carbon footprint, such as concrete and steel. This article explores the feasibility of using materials with a smaller carbon footprint for track structures. Recycled plastics that are currently incinerated might serve as a viable alternative. The key research question revolves around whether GHG emissions resulting from track construction and maintenance can be reduced by utilizing recycled plastics. Among various track components, sleepers were chosen as a potential application for recycled plastic due to their substantial material usage and consequent impact on overall emissions. The study also investigated the necessary material properties for plastic sleepers and assessed whether recycled plastic could meet those requirements. The study investigated recycled plastic fractions, including waste materials recycled by incineration, acrylonitrile butadiene styrene (ABS) from waste electrical and electronic equipment (WEEE), and a byproduct of liquid packaging cardboard repulping (LPB repulping reject). These materials offer a reduced carbon footprint because they have already completed one life cycle and can still be recycled as material. To assess their mechanical properties, laboratory tests were conducted on injection-molded test rods made from recycled plastic components. These rods underwent tensile and bending tests using a universal testing device. Additionally, the softening temperatures of the materials were measured through Vicat and HDT tests. Finally, based on the amount of waste material flows, the emission reduction potential obtained using recycled plastic was evaluated. Recycled ABS is significantly more suitable for use in track structures due to its superior mechanical durability compared to LPB repulping reject. Additionally, recycling ABS as a sleeper material significantly reduces overall GHG emissions compared to incineration. [ABSTRACT FROM AUTHOR]

One of the most frequently used polymers in the galvanic industry as well as for Fused Filament Fabrication (FFF) is the terpolymer of acrylonitrile butadiene styrene (ABS). Its surface is etched in chromosulfuric acid to enable the chemical deposition of a metal. The use of chromium (Cr)(VI) compounds is restricted in the European Union (EU) since 2017. A new plating process is proposed here that does not rely on etching. Instead, double bonds on the ABS surface are converted to epoxides, followed by grafting of a polyethylenimine (PEI) to the surface. The so modified plastic is an ideal starting point for metal plating. Printing often leads to the formation of voids between strands and layers, which hinders subsequent wet processing. The plating process introduced here requires high demands on the water tightness of parts. The proposed printing procedure reduces the degree of penetration of water from 50% to less than 0.1% at 2 bar water pressure. The combination of the new printing procedure with the new plating process results in the deposition of industrial relevant nickel (Ni) layers. The cross‐hatch test followed by a peel test exhibits values of zero, pointing to the high adhesion of Ni to ABS. [ABSTRACT FROM AUTHOR]

Advances in the development of additive manufacturing materials (AM) and the low availability of studies on the impact response of AM specimens are the main reasons for this paper. Therefore, the influence of building orientation (vertical and horizontal) and the angle of the raster (15°/−75°, 30°/−60°, 45°/−45°, and 0°/90°) on the tensile and impact strength of AM specimens was investigated. The polylactic acid (PLA)-PolyMax, Mediflex and acrylonitrile-butadiene-styrene (ABS) filaments were chosen to provide a comprehensive characterization of AM materials with versatile mechanical properties. The experimental results of this study show that the tensile strength and toughness of PolyMax PLA specimens are comparable to ABS specimens, while Mediflex samples are characterized by their higher toughness, but lower impact force needed to break the samples. The Mediflex Charpy fracture surfaces exhibit a ductile character compared to those of brittle ABS and PLA. Furthermore, fracture surface morphology shows the allocation of voids, which helps us to understand differences in mechanical properties, and allows one to properly interpret the results of the geometrical accuracy of AM specimens with various printing settings. [ABSTRACT FROM AUTHOR]

Recent advancements in 3D printing technology have enabled the rapid production of complex structures, yet the dielectric performance of 3D printing materials and their potential for manufacturing electrical components remain insufficiently studied. In this study, a capacitor rated at 10 kV with a capacitance of 1 nF was designed and developed for high-voltage applications. During the production of the capacitor, the insulating and conductive parts were fabricated using a 3D printer. While PLA, ABS, ASA, and PETG were employed as insulating materials, aluminum was chosen as the conductive part. Theoretical calculations and the finite element method were used to validate the measured capacitance of the equipment. The performance of the prototype capacitor was analyzed through partial discharge inception voltages (PDIV), dissipation factor (tanδ), and breakdown voltage measurements. Dissipation factor measurements were performed at 2 and 4 kV voltages in the 50–400 Hz frequency range. The performance of employed materials was comparatively analyzed through experimental and simulation results. Finally, the impact of different insulating materials on the dielectric performance of the prototype capacitors was evaluated. [ABSTRACT FROM AUTHOR]

Insulating materials can be classified into solid, liquid, and gaseous forms. Solid insulation materials are divided into different types such as organic, inorganic, and polymer types. In electrical circuits, solid insulation materials are generally used as components that provide insulation and mechanical support. In recent years, as a result of developing technologies, the production of participation insulation materials with 3D printing technology has become widespread. Three-dimensional printing technology enables the rapid creation of objects by combining materials based on digital model data. It is important to evaluate the materials produced with 3D printing in terms of insulation coordination. Studies have shown that the electrical breakdown strength of solid dielectrics varies depending on factors such as sample type, thickness, the magnitude of applied voltage, and the temperature of the physical environment. According to IEC-60243 standards, there are various methods to measure the breakdown strength of solid insulators applied to different voltage types. In this study, the behavior of PLA, ABS, ASA, PETG, and PC/ABS materials produced with 3D printing and having the potential to be used as insulation materials when exposed to high voltage within the scope of insulation coordination was investigated. The breakdown strengths of solid insulation materials produced with 3D printing were measured in the high-voltage laboratory within the scope of IEC-60243. Breakdown strength was statistically evaluated with the Weibull distribution. Damage analysis of the breakdowns in the test specimens was examined in detail with ImageJ software. With the comparative analysis, the behaviors of PLA, ABS, ASA, PETG, and PC/ABS solid insulation materials were revealed and their superiority over each other was determined. [ABSTRACT FROM AUTHOR]

Background: Specialized outpatient palliative care (SAPV) is a component of palliative care in Germany, which assists approximately 10% of palliative patients. The majority of these patients have a malignant disease and are at increased risk of complications or severe infection. Antibiotic stewardship (ABS) measures are implemented to optimize antibiotic administration; however, there is little data available in this area, particularly for SAPV. Therefore, we examined the extent to which ABS measures can be meaningfully used or implemented in SAPV. Methods: After establishing a corresponding interview guide, 15 experts from specialized areas were interviewed on this subject by the Institute for Market Research in Healthcare Munich (IMIG) through audio-registered individual interviews. The interviews were analyzed using the qualitative content analysis method according to Mayring. Results: All 15 experts participated. The primary benefits cited were greater safety in the prescription and decision-making process for antibiotics in the areas of SAPV and improved quality of life. The implementation of continuous ABS measures for SAPV was considered difficult in some cases and linked to certain prerequisites, such as supportive advice from existing systems. The possibility of further training for SAPV members in the area of ABS was considered particularly advantageous. Conclusions: The implementation of ABS measures in SAPV is feasible in principle; however, it is difficult to implement under the current conditions. Close cooperation with an existing external ABS expert/team will be helpful. This will provide more security for a small, but relevant proportion of SAPV patients, and for the SAPV team treating them. [ABSTRACT FROM AUTHOR]

A variety of NiP-TiC-SiC nanocomposite coatings were deposited to acrylonitrile–butadiene–styrene (ABS) substrates at varying plating periods and bath temperatures using electroless plating. A field emission scanning electron microscope (FESEM) demonstrates the production of various coating morphologies. Morphology analysis of the deposit coatings shows homogenous, compact, and nodular structured coatings free of any apparent defects in most deposition conditions, except at extra high-temperature deposition baths, some gas bubbles under the coating layers were seen. The patterns of X-ray diffraction (XRD) illustrate nickel peaks at 44.5 which relates to Ni (111). Energy-dispersive X-ray spectroscopy (EDX) data show that the coating's main constituents are nickel, phosphorus, and nanoparticles. According to the results of the contact angle test, the potentiodynamic polarization, and the impedance spectroscopy (EIS) tests conducted in (3.5%) of NaCl by weight at (25 °C), the nanocomposite coating that was created at 90 min and 75 °C exhibited the best hydrophobic qualities and corrosion resistance. The coating formed at 30 min and 75 °C illustrates the best hardness value. The adhesion force was calculated using the ASTM D 3359 method (B). The findings demonstrate that the coating made under the following deposition conditions, 30 min at 75 °C, 30 min at 95 °C, and 90 min at 75 °C, produces the best bonding strength between the coating and ABS substrate (standard classification 5B); however, the complete gas bubble rejection process from the substrate is rendered difficult by deposition times longer than 30 min in a bath over 85 °C, which decreases the adhesion between NiP-TiC-SiC and the acrylonitrile–butadiene–styrene substrate. The wear rate shows a direct relationship with the coefficient of friction rather than hardness, and the coated prepared at 90 min at 75 °C offers a lower wear rate and coefficient of friction. [ABSTRACT FROM AUTHOR]

The use of polymer materials in various fields has increased significantly due to their ease of thermoforming and relatively low production costs. The production volume of these materials is extremely high, and according to forecasts from global statistical centers, it is expected to continue rising in the future. However, the extensive use and easy availability of polymeric materials have caused significant ecological problems. The world faces large amounts of polymer waste and environmental pollution. Plastic recycling remains challenging due to issues related to sorting polymer waste and separating it according to polymer types. Recycling certain plastics requires only a quarter of the energy needed to produce new plastic. To address this, circular economy principles should be applied to 3D printing products made from polymeric materials. A particularly wide application of these technologies is found when polymeric materials are used due to their low cost, low melting temperatures, and other advantageous properties. This paper investigates the impact of plastic recycling on the quality of 3D-printed products. During the research, samples were 3D printed and tested using both virgin and recycled PLA, ABS, and PET-G materials. The samples underwent static and dynamic tests to determine their mechanical properties, such as tensile strength, elongation, and impact resistance. The research results showed that the properties of recycled polymer materials deteriorate, with relative elongation of recycled and 3D-printed materials decreased by 16–45%. Despite this, recycled polymer materials can still be used, but it is necessary to account for the reduction in plasticity when creating products that will be exposed to dynamic loads. The impact strength is reduced by 6% for PLA, 54% for ABS, and 58% for PET-G. Additionally, the research included tests on samples printed with 3D printing technology that were exposed to UV irradiation. The results indicated similar dependences, as UV exposure also affects the reduction of material plasticity. After 66 Wh/m2 of UV radiation, the tensile strength of PET-G and PLA decreased by 17%, while ABS showed a reduction of about 5%. [ABSTRACT FROM AUTHOR]

Annealing is a popular post-process used to enhance the performance of parts made by fused filament fabrication. In this work, four different carbon-fiber-based composites were subjected to two different annealing methods to compare their effectiveness in terms of dimensional stability, surface roughness, tensile strength, hardness, and flexural strength. The four materials include PLA-CF, PAHT-CF, PETG-CF, and ABS-CF. The annealing methods involved heating the printed composites inside an oven in two different ways: placed on a tray and fluidized bed annealing with sharp sand. Annealing was conducted for a one-hour time interval at different annealing temperatures selected as per the glass transition temperatures of the four materials. The results showed that oven annealing provides better results under all scenarios except dimensional stability. PETG-CF and ABS-CF composites were significantly affected by oven annealing with expansion along the z-axis as high 8.42% and 18% being observed for PETG-CF and ABS-CF, respectively. Oven annealing showed better surface finish due to controlled and uniform heating, whereas the abrasive nature of sand and contact with sand grains caused inconsistencies on the surface of the composites. Sand annealing showed comparable hardness values to oven annealing. For tensile and flexural testing, sand annealing showed consistent values for all cases but lower than those obtained by oven annealing. However, oven annealing values started to decrease at elevated temperatures for PETG-CF and ABS-CF. This work offers a valuable comparison by highlighting the limitations of conventional oven annealing in achieving dimensional stability. It provides insights that can be leveraged to fine-tune designs for optimal results when working with different FFF-printed carbon-fiber-based composites, ensuring better accuracy and performance across various applications. [ABSTRACT FROM AUTHOR]

Fruit wastes from the agro‐industry may be used in the preparation of polymer/natural fiber composites. In the current scenario, there is a growing need for sustainable materials that can reduce environmental impact while maintaining or enhancing material properties. One promising approach is the incorporation of natural fibers derived from fruit waste into polymers, which aligns with the global push toward eco‐friendly and circular economy solutions. This work was aimed at the development of filaments of acrylonitrile–butadiene–styrene (ABS)/natural fiber composites for 3D and 4D printing. The fibers used were banana (BAN) peel, orange (ORG) peel, cinnamon (CIN), and neem (NEEM) leaf fibers. The rheological, mechanical, and shape memory properties of the ABS/BAN and ABS/ORG composites were compared with those of the ABS/CIN and ABS/NEEM composites. A slight decrease in viscosity was observed with the addition of the natural fibers to ABS. The ABS/ORG composites showed the highest mechanical properties and good adhesion between the printed layers. The particulate eco‐friendly natural fibers can also be used as pigments, where different types of colors can be obtained. The ABS/natural fiber composites can be processed at the same processing conditions as ABS. The incorporation of natural fibers significantly increased the shape memory result. The use of ABS/natural fiber composites proved to be feasible for preparing the filaments and 3D/4D printing of objects. Highlights: The properties of 3D/4D‐printed ABS/natural fiber composites were investigated.Banana and orange peel, cinnamon, and neem leaf fibers were used.Filaments of ABS/natural fiber composites were successfully obtained.The addition of the fibers to ABS decreased the viscosity and increased shape memory.Among the composites, ABS/orange peel showed the highest mechanical properties. [ABSTRACT FROM AUTHOR]

Scientific advances and technological requirements to develop carbon fibre-reinforced polymers (CFRP) with excellent strength-to-weight ratios led to the high consumption of CFRP composites. The mechanical recycling of CFRP is a simpler, more economical, and environmentally responsible solution for effectively recovering this structural material that contains epoxy resin and carbon fibre. CFRP laminates were placed on a Computer Numerical Control (CNC) and milling cutting at 1100, 1800, and 2500 rpm. The recovered CFRP particles were mixed with acrylonitrile butadiene styrene (ABS) using the melt intercalation approach. Recovered CFRP particles increased the molecular mobility and reduced the thermal stability of ABS. The main differences between the ABS and the composites were a more pronounced necking region in the ABS than in the composites and a notable reduction in strain. The strain of the ABS was 27.58%, while in the composites, it was 4.29, 4.02, and 3.51%, depending on the cutting speed. Thus, ductility decreased up to 87% in the composites. This work's successful CFRP mechanical recycling method provides epoxy powder, individual carbon fibres, and CFRP particles, opening a research field of great economic and environmental relevance in developing new materials. [ABSTRACT FROM AUTHOR]

One of the key factors in manufacturing products by fused deposition molding (FDM) or layer-by-layer printing technology is the material intensity of the product. The task of reducing the amount of material required to manufacture a product without significant loss of mechanical properties is one of the most practically important technological tasks. Material saving in FDM printing of products allows to reduce financial costs and increase the speed of manufacturing of the final product without reducing (or not significantly reducing) the quality properties of the product. In our work it is demonstrated that using Combs filling type and materials of poly lactic acid (PLA) and polyethylene terephthalate glycol (PETG) it is possible to achieve material savings of up to 23% at 50% filling for PLA and 17% at 75% filling for PETG without significant reduction of product strength in comparison with other filling types. Exceptions are PLA samples with 100% fill and Lateral fill. Application of Kruskal-Wallis criterion and Dunn's criterion with Bonferroni multiple comparison correction showed that there were no statistically significant differences within the strength limits of samples made by FDM printing technology from PLA and PETG plastics (p-value = 0.0514), as well as samples with Triangle and Grid filling type (p-value = 1). Based on this result, three groups of samples statistically significantly differing in ultimate strength were identified by methods of hierarchical cluster analysis; in each group (except for group 1, which included samples made of PLA plastic with Lateral filling type and 100% filling), correlation analysis was performed (Spearman correlation was used). The results of the correlation analysis showed a stable average correlation between the percentage of filling, modulus along the secant 0.05–0.2% strain, ultimate strength and strain corresponding to the yield stress. Analysis of the correlation graph showed that the main parameter correlating with all mechanical properties of the specimen is the 0.05–0.2% strain modulus. Based on this conclusion, robust regression equations predicting the 0.05–0.2% strain modulus as a function of the percentage of specimen filling were constructed for the two selected groups. Analysis of the equations showed that in the third group of specimens, the average modulus of 0.05–0.2% strain is more than twice the modulus of 0.05–0.2% strain in the second group. The detected statistical regularities can be explained by the mechanism of strain hardening, the actual value of which depends on the structure of the macrodefect (type of filling), properties and volume of the material (percentage of filling) used in the fabrication of samples using FDM printing technology. [ABSTRACT FROM AUTHOR]

Highlights To improve the thermal conductivity and mechanical properties of graphene‐acrylonitrile butadiene‐styrene plastic (ABS) composite, sub‐phosphite‐based ionic liquid (IL) was synthesized, and its structure was characterized by FTIR, NMR, and mass spectrometry. IL was as a modifier, and graphite powder (G powder) was modified by the ball milling method to obtain functional graphene thermal conductive filler (G‐IL). The structure and morphology of G‐IL were characterized by FTIR, X‐ray photoelectron spectroscopy (XPS), XRD, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results of the Molau test showed that the presence of IL improved the interfacial interaction of G‐IL and ABS, enhanced the dispersion of G‐IL in the ABS matrix, made G‐IL contact with each other, and it was easier to establish a thermal conduction network and promote phonon transfer. The thermal conductivity of 9 wt% G‐IL/ABS composite was 0.392 W·m−1·k−1, which was 96% and 14% higher than that of pure ABS and G/ABS composite, respectively. The tensile strength and bending modulus of 9 wt% G‐IL/ABS composite were 44.89 and 2124.37 MPa, which were 13% and 11% higher than those of pure ABS, respectively. The impact strength of 9 wt% G‐IL/ABS composite was 34.17 kJ/m2. It was 18% and 7% higher than that of pure ABS and 9 wt% G‐IL/ABS, respectively. Phosphorus imidazole ionic liquids were prepared. Graphene was modified by ionic liquids through non‐covalent. Enhanced mechanical properties and thermal conductivity of G‐IL/ABS composites. [ABSTRACT FROM AUTHOR]

This paper utilizes the Wohler curve and the J-integral principle to predict the service life of purposely-damaged acrylonitrile butadiene styrene (ABS) specimens. The hardness of single- and double-notched specimens was measured using the J-integral, facilitating a comparison between two different types of defects. By analyzing the Wohler curve, we were able to examine the decline in the service life of the ABS specimens over various time intervals. According to the comparison, a hole with a single internal notch flaw is not as detrimental as one with two notch defects. [ABSTRACT FROM AUTHOR]

By utilizing four different types of typical compatibilizers and dicumyl peroxide (DCP), toughening modification was performed on the blend system of polylactic acid/acrylonitrile-butadiene-styrene copolymer (PLA/ABS). The compatibility and crystallization properties of the blend system were characterized and tested through mechanical property tests, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The results showed that the addition of compatibilizers could form a better dispersed "sea-island" phase structure in the blend system, with the tensile strength and impact strength increasing by up to 18.23% and 21.98%, respectively, although the crystallization capability decreased. With the addition of both compatibilizers and DCP, the phase structure of the blend system transformed into coexisting "sea-island" and "sea-sea" phases, with the maximum increases in tensile strength and impact strength of 47.99% and 86.64%, respectively. The compatibilizers and DCP synergistically enhanced the toughening effect on the blend system and improved its crystallization capability. [ABSTRACT FROM AUTHOR]

Abstract Background Specialized outpatient palliative care (SAPV) is a component of palliative care in Germany, which assists approximately 10% of palliative patients. The majority of these patients have a malignant disease and are at increased risk of complications or severe infection. Antibiotic stewardship (ABS) measures are implemented to optimize antibiotic administration; however, there is little data available in this area, particularly for SAPV. Therefore, we examined the extent to which ABS measures can be meaningfully used or implemented in SAPV. Methods After establishing a corresponding interview guide, 15 experts from specialized areas were interviewed on this subject by the Institute for Market Research in Healthcare Munich (IMIG) through audio-registered individual interviews. The interviews were analyzed using the qualitative content analysis method according to Mayring. Results All 15 experts participated. The primary benefits cited were greater safety in the prescription and decision-making process for antibiotics in the areas of SAPV and improved quality of life. The implementation of continuous ABS measures for SAPV was considered difficult in some cases and linked to certain prerequisites, such as supportive advice from existing systems. The possibility of further training for SAPV members in the area of ABS was considered particularly advantageous. Conclusions The implementation of ABS measures in SAPV is feasible in principle; however, it is difficult to implement under the current conditions. Close cooperation with an existing external ABS expert/team will be helpful. This will provide more security for a small, but relevant proportion of SAPV patients, and for the SAPV team treating them.

ABSTRACTScientific advances and technological requirements to develop carbon fibre-reinforced polymers (CFRP) with excellent strength-to-weight ratios led to the high consumption of CFRP composites. The mechanical recycling of CFRP is a simpler, more economical, and environmentally responsible solution for effectively recovering this structural material that contains epoxy resin and carbon fibre. CFRP laminates were placed on a Computer Numerical Control (CNC) and milling cutting at 1100, 1800, and 2500 rpm. The recovered CFRP particles were mixed with acrylonitrile butadiene styrene (ABS) using the melt intercalation approach. Recovered CFRP particles increased the molecular mobility and reduced the thermal stability of ABS. The main differences between the ABS and the composites were a more pronounced necking region in the ABS than in the composites and a notable reduction in strain. The strain of the ABS was 27.58%, while in the composites, it was 4.29, 4.02, and 3.51%, depending on the cutting speed. Thus, ductility decreased up to 87% in the composites. This work’s successful CFRP mechanical recycling method provides epoxy powder, individual carbon fibres, and CFRP particles, opening a research field of great economic and environmental relevance in developing new materials.

Abstract One of the key factors in manufacturing products by fused deposition molding (FDM) or layer-by-layer printing technology is the material intensity of the product. The task of reducing the amount of material required to manufacture a product without significant loss of mechanical properties is one of the most practically important technological tasks. Material saving in FDM printing of products allows to reduce financial costs and increase the speed of manufacturing of the final product without reducing (or not significantly reducing) the quality properties of the product. In our work it is demonstrated that using Combs filling type and materials of poly lactic acid (PLA) and polyethylene terephthalate glycol (PETG) it is possible to achieve material savings of up to 23% at 50% filling for PLA and 17% at 75% filling for PETG without significant reduction of product strength in comparison with other filling types. Exceptions are PLA samples with 100% fill and Lateral fill. Application of Kruskal-Wallis criterion and Dunn’s criterion with Bonferroni multiple comparison correction showed that there were no statistically significant differences within the strength limits of samples made by FDM printing technology from PLA and PETG plastics (p-value = 0.0514), as well as samples with Triangle and Grid filling type (p-value = 1). Based on this result, three groups of samples statistically significantly differing in ultimate strength were identified by methods of hierarchical cluster analysis; in each group (except for group 1, which included samples made of PLA plastic with Lateral filling type and 100% filling), correlation analysis was performed (Spearman correlation was used). The results of the correlation analysis showed a stable average correlation between the percentage of filling, modulus along the secant 0.05–0.2% strain, ultimate strength and strain corresponding to the yield stress. Analysis of the correlation graph showed that the main parameter correlating with all mechanical properties of the specimen is the 0.05–0.2% strain modulus. Based on this conclusion, robust regression equations predicting the 0.05–0.2% strain modulus as a function of the percentage of specimen filling were constructed for the two selected groups. Analysis of the equations showed that in the third group of specimens, the average modulus of 0.05–0.2% strain is more than twice the modulus of 0.05–0.2% strain in the second group. The detected statistical regularities can be explained by the mechanism of strain hardening, the actual value of which depends on the structure of the macrodefect (type of filling), properties and volume of the material (percentage of filling) used in the fabrication of samples using FDM printing technology.

In anti-lock brake systems (ABS), the primary goal of the controller is to maximize vehicle deceleration by maintaining the slip ratio at an optimal level. This work presents a fresh approach that enhances ABS performance by integrating a sliding mode controller with a barrier function. This method combines integral sliding mode control with adaptive laws informed by barrier functions, effectively managing external disturbances and uncertainties in inertia. A significant benefit of this approach is that it does not require prior knowledge of the upper limits of these uncertainties and disturbances, thanks to the barrier function-based sliding mode control. The system state is initially aligned with the switching manifold, ensuring robust compensation for any uncertainties and disturbances right from the start of braking. During the sliding mode phase, dynamic properties are finely tuned to ensure that the system’s performance remains consistent. The effectiveness and reliability of the proposed controller have been demonstrated through numerical simulations conducted in MATLAB/Simulink, proving its capability across a range of road conditions.

Metallization of polymers is a modern technique used to improve their properties by coating them with conductive, lightweight surfaces, enabling their use in many electronic and communications applications. This study examines the effect of corrosion of a copper layer deposited on two polymeric substrates, high-density polyethylene (HDPE) and acrylonitrile butadiene styrene (ABS), by flame thermal spraying. Pull off test shows the adhesion strengths between the Cu coating layers and the HDPE and ABS substrates were 1.42 and 1.94 MPa, respectively. The contact angles for the HDPE and ABS were 57.227 and 36.422ο, respectively, indicating that the ABS substrate is more wettable than the HDPE substrate. A corrosion test of the coated substrates was conducted at 27±1 °C in a solution of 3.5% NaCl. The corrosion rate was 2.763×10-2 mm/year for Cu on HDPE and 1.361×10-2 mm/year for Cu on ABS. The corrosion rate of Cu on HDPE is greater than that of Cu on ABS, indicating that the Cu coating layer on the ABS substrate is denser and less porous than that on the HDPE substrate. The corrosion products for the corroded Cu layer on HDPE were NaCl, NaOH, Cu5Zn8 and CuCl, whereas those for the corroded Cu on ABS were CuCl and Cu(OH)2. [ABSTRACT FROM AUTHOR]

Saving STL files for 3D printing is an essential process that directly influences part quality and print time. The level of detail of the geometry of the triangles, the deviation tolerance, the correct orientation and the integrity of the model are critical factors to consider. Print settings such as layer height, print speed and extruder temperature have a significant impact on the final result. Effective printing depends on the correct adjustment of these parameters, ensuring the balance between time and quality. [ABSTRACT FROM AUTHOR]

This paper presents the results of a comparative analysis of three prevalent materials used in 3D printing. PLA (Polylactic Acid), ABS (Acrylonitrile Butadiene Styrene), and PET-G (Polyethylene Terephthalate Glycol). The study includes strength testing using a tensile testing machine. Beginning with the selection of the input material used in the 3D printing process, the research aimed to provide insights into the strength properties of these materials. Autodesk Fusion 360 software was used for the precise design of the 3D model, ensuring suitability for subsequent tensile testing. The physical samples were then printed using 3D printing technology. The samples were subjected to a strength examination using a tensile testing machine. The data collection phase recorded and compiled the results of each strength test, forming the foundation for a comprehensive analysis. Using statistical methods and comparative analyzes, the data were thoroughly examined, allowing the derivation of conclusive observations and insights into the comparative strengths of PLA, ABS, and PET-G. The findings not only contribute to a deeper understanding of material performance but also provide a guide for material selection in 3D printing applications, guiding future research endeavors and industry applications in the everevolving landscape of additive manufacturing. [ABSTRACT FROM AUTHOR]

A study is conducted, it researches the design, making and bypass of the drone propeller. Discovering the streamlined qualities of the different propeller designs using the computational apparatus, the software is utilized. A mini-summarized propeller having such mechanisms was fabricated and the trials done confirmed their success. Whilst the multi material approach mitigates against lightness with strength, durability will be the weakest link in that process. With weight and streamlined failures, fragility is always a factor. This assessment should aid in overhauling current drone propulsion systems, such as durability and efficiency, to enhance performance and increase persistence. The FSI system was employed to study airflow patterns using fans and stress factors by printing parts with PLA, ABS and PGA printing materials. The air was channeled over the materials, simulating actual flight, to evaluate the materials' strength. The drone model DJI MINI 3 PRO was subjected to the experimental tests of the speed and the maximum height. The height of the fan in MINI 3 PRO could be higher with the maximum speed of 37.3 km/h and it would be 187 meters in MINI 2 PRO concerning this aspect. ABS material speeds and jumps higher than the PGA material. It turns out that the 3 PRO propeller fans have the highest thrust force of 5.1 m/s at the highest speed, which is different from the 2 PRO propeller fan that measures only 3.2 m/s. The 3 experiences 0.155 mm distortion, whereas the 2 produced 0.103 mm. PLA material has the least value of influence among all. [ABSTRACT FROM AUTHOR]

As a typical 3D printing process, fused filament fabrication still has disadvantages when operating on manufacturing lines due to the non-uniform textures of the oriented surfaces of the 3D-printed components. This work investigates the effects of structural parameters, i.e., orientations angle, ABS and PLA materials, three different layer thicknesses, three different perimeters, and three different infill rates utilizing a balanced modified Taguchi experimental design and 63 different parametric combinations to characterize the surface roughness parameters: average Ra, mean roughness depth Rz, root mean square Rq, skewness Rsk, and kurtosis Rku. The analysis of the experimental results, i.e., the levels mean values analysis plots and linear residual analysis of variances, showed that the layer thickness strongly influences all surface parameters and interacts considerably with all orientations. In contrast, material type, number of perimeters, and infill rate had insignificant impacts on surface roughness parameters. Finally, the additive linear modelling approach was utilized and validated for proper predictions, making it helpful for surface engineering applications. [ABSTRACT FROM AUTHOR]

Disposing of non-biodegradable conventional polymers such as polyethylene, polypropylene, polyvinyl chloride, and acrylonitrile-butadiene-styrene (ABS) is a severe environmental problem across the globe. ABS, a non-biodegradable polymer, is widely used for producing auto components, home appliances, electronic goods, etc., but it is not environment friendly. Therefore, there is a pressing need to develop biodegradable polymers as an alternative to non-biodegradable polymer materials. This paper aims to offer blended bio-based polylactic-acid (PLA) polymer with ABS for engineering applications to minimize the consumption of virgin petroleum-based ABS polymer. The effort is to ascertain the best-suited composition of ABS/PLA blended polymer with excellent thermal and mechanical properties. The five specimens of blended ABS/PLA polymers have been prepared using four compositions (80/20, 60/40, 40/60, and 20/80) using the material extrusion (MEX) 3D printing process and assessed for mechanical and thermal properties. The tensile strength and MFR of the ABS/PLA blend increased by 8.75 and 124.35%, respectively, with ABS/PLA polymers having a 20/80 wt.% composition. The thermal analysis of blends with varying blend compositions using DSC and FTIR have shown partial compatibility between ABS and PLA polymers. Furthermore, scanning electron microscopy (SEM) of tensile fractured specimens has been analyzed to support the evidence. [ABSTRACT FROM AUTHOR]

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Formulating polymer blends is of vital scientific and industrial interest because of their low cost and the possibility of producing new materials with tailored properties. In this research, polypropylene (PP)/acrylonitrile–butadiene–styrene (ABS) polymer blends were prepared using styrene-ethylene-butylene-styrene (SEBS) and styrene-ethylene-propylene (SEP) copolymers. The polymer blends were extruded and injection molded to evaluate the mechanical, rheological, thermal, and thermomechanical properties, infrared spectroscopy, and morphology. Incorporating SEBS and SEP copolymers into the PP/ABS blend increased the torque and reduced the melt flow index, indicating higher viscosity than the PP/ABS base system. As a result, improved compatibility of PP/ABS/SEBS and PP/ABS/SEP blends was achieved, thereby improving the mechanical properties of PP/ABS. However, the SEBS copolymer was more effective. Compared to neat PP, the PP/ABS/SEBS blend with 15% SEBS showed increases in impact strength, elongation at break, and heat deflection temperature (HDT) of 87%, 107%, and 7%, respectively. In addition, the elastic modulus and Shore D hardness were in line with neat PP, and thermal stability measured through thermogravimetry exceeded that of PP by 8 °C. Evidence of fractured ABS particles in the PP matrix was seen in the scanning electron microscopy (SEM) morphology, suggesting that SEBS migrated to the interface. SEBS also remained dispersed in the PP matrix, as confirmed by selective phase extraction, which favored a synergic effect of properties in the PP/ABS/SEBS blend (70/15/15%). This blend offered potential for applications such as toys, furniture accessories, packaging, and housewares. [ABSTRACT FROM AUTHOR]

The paper describes the type of changes in the structure and mechanical properties of 3D printed shapes under the influence of mineral oil. The effects of a room (23 °C) and elevated temperature (70 °C) on 3D prints manufactured by the FDM method and stored in oil for 15, 30, and 60 days on the change of properties and structure were investigated. The samples were produced from ABS (poly(acrylonitrile-co-butadiene-co-styrene)), ASA (poly(acrylonitrile-co-styrene-co-acrylate), PLA (poly(lactic acid)), and HIPS (high-impact polystyrene). Tests related to the strength of the materials, such as the static tensile test and Charpy impact test, were carried out. The structure was evaluated using a scanning electron microscope, and changes in chemical structure were determined by conducting FTIR (Fourier transform infrared spectroscopy) and TGA (thermogravimetric analysis) tests. The analysis of the results provided important information about the impact of mineral oil on specific materials. This is critical for designing and manufacturing components that can withstand mineral oil exposure in real-world environments. The materials underwent varying changes. Strength increased for PLA by about 28%, remained unchanged for ABS and HIPS during exposure for 30 days, and decreased for ASA with extended exposure up to 14%. [ABSTRACT FROM AUTHOR]

Ultrasonic welding (USW) of thermoplastics plays a significant role in the automobile industry. In this study, the effect of the welding time on the joint strength of ultrasonically welded acrylonitrile–butadiene–styrene (ABS) and the weld formation mechanism were investigated. The results showed that the peak load firstly increased to a maximum value of 3.4 kN and then dropped with further extension of the welding time, whereas the weld area increased continuously until reaching a plateau. The optimal welding variables for the USW of ABS were a welding time of 1.3 s with a welding pressure of 0.13 MPa. Interfacial failure and workpiece breakage were the main failure modes of the joints. The application of real-time horn displacement into a finite element model could improve the simulation accuracy of weld formation. The simulated results were close to the experimental results, and the welding process of the USW of ABS made with a 1.7 s welding time can be divided into five phases based on the amplitude and horn displacement change: weld initiation (Phase I), horn retraction (Phase II), melt-and-flow equilibrium (Phase III), horn indentation and squeeze out (Phase IV) and weld solidification (Phase V). Obvious pores emerged during Phase IV, owing to the thermal decomposition of the ABS. This study yielded a fundamental understanding of the USW of ABS and provides a theoretical basis and technological support for further application and promotion of other ultrasonically welded thermoplastic composites. [ABSTRACT FROM AUTHOR]

Thermoplastic polyurethane (TPU) has emerged as extremely benign materials for next-generation manufacturing using additive manufacturing processes due to its favorable mechanical properties, durability, and as well as biocompatibility. However, the lack of stiffness of TPU affects its buckling strength and performance efficiency. Therefore, an efficient method of optimization of a 3D-printable composition of TPU-based blends is necessary. In this work, attempts were made to explore material extrusion additive manufacturing technique of acrylonitrile–butadiene–styrene (ABS)/TPU blends with particular reference to mechanical and damping behaviour. Design of experiment (DoE) was used to determine the optimum printing parameters. Rheological studies were exploited to understand the printability, and optimum 3D-printable blend composition. The damping behaviour of each blend composition was calculated and a damping ratio (ξ) between 1 ≤ ξ ≤ 2 was observed for 40 wt% ABS loading, which raised to 1 ≤ ξ ≤ 4 for 80 wt% ABS loaded blend specimen. Furthermore, for ABS incorporated TPU, a significant enhancement of stiffness over neat TPU was achieved, thereby reasonably addressing the filament stiffness issue. This work introduces an efficient method of improving TPU filament printability while parallelly identifying the printable blend composition which can be beneficial for several potential applications. [ABSTRACT FROM AUTHOR]

In the design of plastic solutions for electronic relays, the maximum deformation after injection molding is a key parameter that needs to be controlled. This article conducts a simulation study on the injection molding and deformation of an ABS electronic relay housing. Obtain the optimal gate position through flow resistance and gate matching analysis, and establish a hot runner system based on this. Orthogonal test analysis shows that for deformation, the influence of holding time is extremely significant, the influence of barrel temperature and mold cavity temperature is significant, and the influence of injection time is not significant. The optimized process parameter combination A2B3C1D3 (mold cavity temperature 45 °C, barrel temperature 250 °C, holding time 14 s, and injection time 0.9 s)was obtained by observing the curve of maximum deformation changing with the process level. The simulation verification of the optimized process found that the maximum deformation was reduced from 0.341 0 mm to 0.212 8 mm, with an optimization rate of 37.6%, and the filling state, appearance, injection pressure all met the requirements. [ABSTRACT FROM AUTHOR]

Printability and interlayer adhesion are the most critical issues in 3D printing of immiscible polymer blends. It can affect structural integrity and mechanical performance of the printed parts. In this work, an effective strategy to improve the printability and interlayer adhesion of immiscible acrylonitrile‐butadiene‐styrene/polypropylene (ABS/PP) blends was implemented by introducing styrene–ethylene/butylene–styrene copolymer grafted with maleic anhydride (SEBS‐g‐MA) as a compatibilizer. The printability of the developed blends was investigated using rheological properties such as absolute value of complex viscosity, loss tangent and die‐swell ratio. Interestingly, it was found that the additive manufactured blends with 20 wt% SEBS‐g‐MA loading showed improved interlaminar shear strength, impact strength, Young's modulus and toughness as compared with the pure blend. Fractography analysis revealed that two different possible failure mechanisms, interface and matrix failure were apparent in the 3D printed samples with and without SEBS‐g‐MA content. This work provides a promising pathway to fabricate the complex structures from polymer blends with improved mechanical properties and surface finish. Highlights: This study demonstrated improved interlayer adhesion at the printed interface of immiscible ABS/PP blends in presence of SEBS‐g‐MA.The printability of the developed blends was predicted from rheological properties.Additive manufactured blends with SEBS‐g‐MA loading showed improved mechanical performance. [ABSTRACT FROM AUTHOR]

The primary contributors to greenhouse gas (GHG) emissions in railway transport include the energy consumed during transportation, the materials used for infrastructure construction, and maintenance. Track structures commonly employ materials with a substantial carbon footprint, such as concrete and steel. This article explores the feasibility of using materials with a smaller carbon footprint for track structures. Recycled plastics that are currently incinerated might serve as a viable alternative. The key research question revolves around whether GHG emissions resulting from track construction and maintenance can be reduced by utilizing recycled plastics. Among various track components, sleepers were chosen as a potential application for recycled plastic due to their substantial material usage and consequent impact on overall emissions. The study also investigated the necessary material properties for plastic sleepers and assessed whether recycled plastic could meet those requirements. The study investigated recycled plastic fractions, including waste materials recycled by incineration, acrylonitrile butadiene styrene (ABS) from waste electrical and electronic equipment (WEEE), and a byproduct of liquid packaging cardboard repulping (LPB repulping reject). These materials offer a reduced carbon footprint because they have already completed one life cycle and can still be recycled as material. To assess their mechanical properties, laboratory tests were conducted on injection-molded test rods made from recycled plastic components. These rods underwent tensile and bending tests using a universal testing device. Additionally, the softening temperatures of the materials were measured through Vicat and HDT tests. Finally, based on the amount of waste material flows, the emission reduction potential obtained using recycled plastic was evaluated. Recycled ABS is significantly more suitable for use in track structures due to its superior mechanical durability compared to LPB repulping reject. Additionally, recycling ABS as a sleeper material significantly reduces overall GHG emissions compared to incineration.

In this study, we examined the thermal degradation–induced colour change of acrylonitrile butadiene styrene (ABS)–based titanium dioxide (TiO2)–doped products as a function of TiO2 content and temperature. Based on the time–temperature superposition (tTS) principle and the CIELAB colour space, we proposed a methodology for developing a robust model to estimate the long-term colour change of polymers doped with TiO2 at elevated temperatures. We used 800 h of measurement data to develop the model and validated the colour change predictions of the model in 1600 h. The average colour difference between the measured and modelled results at the application temperature range (below 80 °C) was

Vehicle mobility is an increasingly important issue today, even in the military field. Mobility depends on the condition of the vehicle, the route and, of course, the experience of the driver. Vehicle failures and damage are very common in military operations. It is therefore important to find out how these failures and damage can affect mobility. One of the essential parts of a vehicle is the braking system. The authors therefore decided to investigate what is the effect of a malfunctioning brake system on emergency braking behaviour of a special vehicle in a curvilinear movement. Simulation tests were performed based on an experimentally validated model. The tests were performed with a wheeled vehicle on three different surfaces: concrete, wet asphalt, and ice. The experimental conditions were given as follows – the braking process was considered for a braking system with ABS on and off and for two states of braking system sufficiency (8 braked wheels or 4 rear braked wheels). These tests allowed us to analyse the effect of the extent of the damage on safety, in this case the stopping of the vehicle on a specified curved route. The results of braking and stability on different surfaces and under given conditions are evaluated and described in this paper. On the basis of the results, it is possible to prepare training programmes (scenarios) for drivers of special vehicles for the purpose of driving techniques in critical situations.

Bonsai is a kind of classical art in China and Japan. The traditional method of bonsai shaping of miniature trees is technical and usually requires experienced horticulturists to successfully carry out the process. In order to let ordinary people feel the fun of bonsai shaping, this paper proposes a fast bonsai shaping method, i.e., by use of a plastic guiding mold with customized shape, which is processed by fused deposition 3D printing technology. The tree seedling is bundled onto the mold, and the shape of the mold guides the growth of the tree seedling, thus achieving the purpose of bonsai shaping. In order to further improve the bending properties of the bonsai guiding mold, this paper investigated the main 3D printing parameters of ABS filament. The results showed that with the decrease of printing speed, the increase of extrusion temperature, and the increase of hot bed temperature, the bending strength and elastic modulus of ABS specimens increased, and the bending properties was enhanced; the optimal printing speed was 50 mm/s, the extrusion temperature was 230 °C, and the hot bed temperature was 80 °C. The mechanical properties of the bonsai guiding mold manufactured based on the optimal process parameters were better, the print quality was higher, and it had high practical value.

The rapid and solid joining of thermoplastic to metal is of great significance for structural lightweighting. A thermoplastic acrylonitrile butadiene styrene (ABS) and laser textured 5052 Al is joined by ultrasonic welding with longitude wave in this study. Influence of the texturing type on microstructure and joint strength are investigated. Experimental results showed that the texturing type was a major factor in joint strength, and the mesh array was superior than circular hole array in terms of joint strength. The maximum joint strength of 17.87 MPa was obtained in L1, which was about 2.4 times and 3.6 times of these other two cases. Interfacial and cohesive failure mode was observed, and the fracture surface can be divided into four different parts: light black mark Region Ⅰ, transitional Region Ⅱ, Region Ⅲ with dense residues, and porous structure Region Ⅳ. The joint strength increased with the increase of Regions Ⅱ and Ⅲ while dropped with the occurrence of Region Ⅳ. Thermal decomposition of ABS composite resulted from the high temperature during welding process was responsible for the formation of Region Ⅳ. The joining mechanism in UW of ABS to laser textured 5052 Al was mechanical interlocking. Successful joining of ABS/Al hybrid structure by ultrasonic welding appears to be a reliable and potential technique for industrial applications.

The implementation of three-dimensional (3D) printing technology has culminated in a notable rise in productivity and operational effectiveness for manufacturers. Additive manufacturing (AM) is a manufacturing technology that implies an alteration from the conventional approach of material removal. The fundamental idea underlying the AM technique is the gradual buildup of layers (layer-on-layer accumulation). In conventional approaches, every component can have detrimental implications due to the direct interaction between the tool and the workpiece, leading to the loss of heat through friction. The utilisation of 3D printing as a way to surpass conventional processing methods signifies a novel development in several sectors. This method involves the utilisation of unconventional techniques for the fabrication of components. The primary objective of this research is to investigate the chemical vapour jet drilling technique specifically applied to acrylonitrile butadiene styrene (ABS) materials. The intent is to enhance the surface characteristics, or surface finish (SF), and the dimensional accuracy (DA) of ABS workpieces. An evaluation regarding the reliability, repeatability, as well as preciseness of the vapour jet drilling (VJD) process is conducted via the utilisation of experiment and data analysis. The study employed a Taguchi L9 design of experiments to carry out a series of tests aimed at analysing the implications of three independent variables: pressure, flow rate, and standoff distance. The researchers employed a multiresponse optimisation approach to attain an optimal combination of parameters that resulted in a superior SF with DA. Consequently, the overall appeal of the outcome was reached. The process’s capabilities and dependability were assessed by conducting tests on the substrates at their optimal settings. Surface roughness and circularity were measured at numerous locations on the substrates. The study determined that the process capability indices (C p and C pk) had values over 1.33 for each of the response parameters, with C pk values also exceeding 1. The analysis of histograms and capability indices demonstrates that the VJD method, when conducted under optimised conditions, may be categorised as statistically controlled for the processing of ABS materials.