12 results on '"mechanical properties (E)"'
Search Results
2. Formulating the effects of applied temperature and pressure of hot pressing process on the mechanical properties of polypropylene–hydroxyapatite bio-composites by response surface methodology
- Author
-
Younesi, M. and Bahrololoom, M.E.
- Subjects
- *
COMPOSITE materials , *POLYPROPYLENE , *HYDROXYAPATITE , *TEMPERATURE effect , *PRESSURE , *MECHANICAL behavior of materials , *RESPONSE surfaces (Statistics) , *REGRESSION analysis - Abstract
Abstract: Mechanical properties of polypropylene–hydroxyapatite (PP–HA) bio-composites produced by hot press molding depend on different parameters, particularly the pressure and temperature of the hot pressing process. In this study, a mathematical models for the effects of the pressure and temperature of the hot pressing process on the mechanical properties of the polypropylene–hydroxyapatite composites is developed using a response surface methodology. Ultimate tensile strength, Young’s modulus and impact absorbed energy were target parameters of the formulas and the temperature and pressure of the hot pressing process were independent input parameters. Formulas were derived by a nonlinear regression analysis and then were refined at the end. The validity of the formulas was also verified by experimental data. It was found that the obtained results by the formulas are matched closely to the experimental results; and the formulas have adequate precision in the ranges of the experimental data. The maximum error that occurs for the calculated results by the formulas is about 7%. The effectiveness of the pressure and temperature of hot pressing process on the mechanical properties of the composites was investigated using sensitivity analyses of the formulas. It was found that the sensitivity of the mechanical properties with respect to pressure of hot pressing process is more than temperature. Furthermore, the ultimate tensile strength of the composites has most sensitivity respect to the pressure and temperature of the hot pressing process than other mechanical properties. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF
3. Effect of process parameters on the strength of resistance spot welds in 6082-T6 aluminium alloy
- Author
-
Pereira, A.M., Ferreira, J.M., Loureiro, A., Costa, J.D.M., and Bártolo, P.J.
- Subjects
- *
ALUMINUM alloys , *ELECTRIC welding , *STRENGTH of materials , *FAILURE analysis , *MECHANICAL properties of metals , *WELDED joints , *METAL microstructure - Abstract
Abstract: In this study the microstructural and mechanical behaviour of resistance spot welds (RSW) done on aluminium alloy 6082-T6 sheets, welded at different welding parameters, is examined. Microstructural examinations and hardness evaluations were carried out in order to determine the influence of welding parameters on the quality of the welds. The welded joints were subjected to static tensile-shear tests in order to determine their strength and failure mode. The increase in weld current and duration increased the nugget size and the weld strength. Beyond a critical nugget diameter the failure mode changed from interfacial to pullout. Taking into consideration the sheet thickness and the mechanical properties of the weld, a simple model is proposed to predict the critical nugget diameter required to produce pull-out failure mode in undermatched welds in heat-treatable aluminium alloys. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF
4. Compressive and wear behaviors of bulk nanostructured Al2024 alloy
- Author
-
Jafari, M., Enayati, M.H., Abbasi, M.H., and Karimzadeh, F.
- Subjects
- *
NANOSTRUCTURED materials , *ALUMINUM alloys , *MECHANICAL alloying , *MATERIALS compression testing , *MECHANICAL wear , *X-ray diffraction , *NANOCRYSTALS - Abstract
Abstract: Compressive and wear properties of bulk nanostructured Al2024 alloy prepared by mechanical milling and hot pressing methods were investigated. Al2024 powders were subjected to high-energy milling for 30h to produce nanostructured alloy. As-milled powders were compacted at 500°C under 250MPa in a uniaxial die. Consolidated sample had an average hardness and relative density values of 207.6HV and 98%, respectively. Uniaxial compression tests at strain rates in the range of 1.67×10−4–1.67×10−2 s−1 were performed using an Instron-type machine. The wear behavior of nanostructured sample was investigated using a pin-on-disk technique under an applied load of 20N. The compression and wear experiments were also executed on samples of commercial coarse-grained Al2024-O (annealed) and Al2024-T6 (artificially-aged) alloys, for comparison. The structure of consolidated Al2024 was characterized by X-ray diffraction (XRD). The yield strength and compressive strength of nanostructured Al2024 reached a value of ∼698MPa and ∼712MPa at strain rate of 1.67×10−4 s−1, respectively, which was considerably higher than those for coarse-grained Al2024-O and Al2024-T6 counterparts. Worn surfaces and the wear debris were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and XRD. Nanostructured Al2024 revealed a low friction coefficient of 0.3 and a wear rate of ∼12×10−3 mg/m, which are significantly lower than those obtained for Al2024-O and Al2024-T6 alloys. This enhanced wear resistance was mainly caused by nanocrystalline structure with high hardness value. The dominating wear mechanism of nanostructured Al2024 appeared to be delamination mechanism. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF
5. The effects of thermal treatment on the mechanical properties of wild Pear (Pyrus elaeagnifolia Pall.) wood and changes in physical properties
- Author
-
Gunduz, Gokhan, Aydemir, Deniz, and Karakas, Gurdeniz
- Subjects
- *
MECHANICAL behavior of materials , *PROPERTIES of matter , *ELASTICITY , *STRENGTH of materials , *TEMPERATURE effect , *PEARS , *HEAT treatment , *WOOD testing - Abstract
Abstract: The aim of the study was to investigate the effects of thermal treatment on the mechanical and physical properties of wild pear wood. The results obtained for thermal treatment at 160°C for 2h showed that the modulus of elasticity was increased about 5%, while bending strength and compression strength decreased by 7.42% and 7.55%, respectively. The physical properties of wild pear wood were improved as 2.6%, 5.3%, 8.5% and 0.8% swelling in tangential, radial and longitudinal sections and 1.7%, 1.1% and 0.9% at 50, 65 and 85 Rh% and changes in ΔEab ∗ was 8.50%, respectively. It was determined that the changes ratio of these properties increased as the temperature and durations were increasing. Therefore, wild pear wood can be used as an alternative for tropical woods in decoration and veneer industry. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
6. Effect of equal channel angular pressing (ECAP) on microstructure and properties of Al–SiCp composites
- Author
-
Ramu, G. and Bauri, Ranjit
- Subjects
- *
MECHANICAL behavior of materials , *METAL castings , *MATERIALS compression testing , *ISOSTATIC pressing , *MICROSTRUCTURE , *DEFORMATIONS (Mechanics) - Abstract
Abstract: Aluminium metal matrix composites were processed by stir casting technique with commercially pure aluminium as the matrix material and 5, 10vol.% of SiC (30μm) particulates as the reinforcement. Al–SiCp composites were subjected to severe plastic deformation through equal channel angular pressing (ECAP). As cast Al–SiCp composites shows uniform distribution of particles and there is no change in the particle distribution after ECAP. It was found that ECAP refines the grain size of matrix material. In Al–5vol.% SiCp composite grain size was reduced to 8μm from 45μm after two ECAP passes whereas in Al–10vol.% SiCp composite grain size was refined to 16μm from 45μm after first ECAP pass. Hardness and compression test were conducted at room temperature to evaluate the mechanical properties of the composites. Both the composites exhibit improvement in mechanical properties after ECAP. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
7. Deformation model of brittle and ductile materials under nano-indentation
- Author
-
Lin, Y.C., Weng, Y.J., Pen, D.J., and Li, H.C.
- Subjects
- *
DEFORMATIONS (Mechanics) , *NANOSTRUCTURED materials , *BRITTLENESS , *DUCTILITY , *INDENTATION (Materials science) , *MICROHARDNESS , *DYNAMIC testing of materials , *MECHANICAL loads - Abstract
Abstract: This study proposes a deformation model to elucidate the deformation behaviors of buck materials during various stages of nano-indentation processes. The deformation model presented in this work can be employed to explain the variation of nanohardness with loading conditions, and to elucidate the pop-in phenomenon during nano-indentation. The effect of holding time on hardness is also explained. Brittle materials, Si wafer, and a ductile material, Al single crystal, are used as test specimens in nano-indentation. The experimental results demonstrate that the deformation mechanism developed in this investigation can explain the deformation phenomena of such materials on the nano-scale. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
8. Developing diffusion bonding windows for joining AZ31B magnesium–AA2024 aluminium alloys
- Author
-
Mahendran, G., Balasubramanian, V., and Senthilvelan, T.
- Subjects
- *
DIFFUSION bonding (Metals) , *ALUMINUM-magnesium alloys , *MICROSTRUCTURE , *MECHANICAL behavior of materials , *MATERIALS testing , *INTERMETALLIC compounds - Abstract
Abstract: The principal difficulty when joining Magnesium (Mg)–Aluminium (Al) lies in the existence of formation of oxide films and brittle intermetallic in the bond region. However, diffusion bonding can be used to join these alloys without much difficulty. In this investigation, an attempt was made to develop processing windows for effective diffusion bonding of Mg–Al dissimilar materials. The bonding quality of the joints was checked by microstructure analysis and lap shear tensile testing. Based on the results, diffusion bonding windows were constructed and they will act as reference maps for selecting appropriate process parameters to get good quality bonds. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
9. Development and characterisation of low-cost polymeric composite materials
- Author
-
El-Tayeb, N.S.M.
- Subjects
- *
POLYMERIC composites , *SUGARCANE , *MECHANICAL wear , *MECHANICAL behavior of materials , *TRIBOLOGY , *MATERIALS compression testing - Abstract
Abstract: In this paper, low-cost polymeric composites with reasonable mechanical and tribological properties were successfully developed using untreated sugarcane fibre (SCF) as a reinforcing agent. The sugarcane fibre/polyester (SCRP) composites were prepared with two forms of reinforcement, i.e. chopped fibres (C–SCRP) and unidirectional fibres (U–SCRP). Tensile strength of the C–SCRP composite was critically influenced by the strength of the fibre more than the interfacial adhesion between the SCF and polyester. However, compressive strength, tensile and compressive moduli of the composite were improved by 37%, 132% and 17%, respectively. Adhesive wear results revealed that SCRP has a good degree of wear resistance when sliding against stainless steel. Abrasive wear results showed that U–SCRP composite in APO was more beneficial than C–SCRP composite and U–SCRP composite in PO. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
10. Effect of nickel coating on bending properties of stereolithography photo-polymer SL5195
- Author
-
Liu, Xing Yang and Luan, Benli
- Subjects
- *
NICKEL , *METAL coating , *FLEXURE , *STRENGTH of materials , *PROPERTIES of matter - Abstract
Abstract: The effect of nickel coating on the bending properties of Stereolithography (SL) parts was investigated. It was found that a thin layer of nickel coating significantly improves the flexural strength and modulus of the SL specimens. The strengthening effect of the coating is dependent on the ratio of the Young’s moduli of the coating and the substrate materials, as well as the thickness of the coating. [Copyright &y& Elsevier]
- Published
- 2005
- Full Text
- View/download PDF
11. Effect of equal channel angular pressing (ECAP) on microstructure and properties of Al–SiCp composites
- Author
-
G. Ramu and Ranjit Bauri
- Subjects
Equal channel angular pressing ,Metal refining ,Materials science ,Metal matrix composites (A) ,Composite number ,Uniform distribution ,Particle distributions ,Particle size analysis ,chemistry.chemical_element ,Mechanical properties ,Silicon carbide ,Pressing (forming) ,Compression tests ,Metallic matrix composites ,Aluminium ,Composite grains ,Composite material ,As-cast ,Room temperature ,Stir casting (C) ,Pressing ,Aluminium metal matrix composites ,Mechanical properties (E) ,Metallurgy ,Microstructure and properties ,Compression testing ,Microstructure ,Grain size ,Reinforcement ,Severe plastic deformations ,Metal casting ,Pure aluminium ,Stir casting ,chemistry ,Compression test ,Particle ,Severe plastic deformation ,Grain size and shape ,Matrix materials ,Aluminum - Abstract
Aluminium metal matrix composites were processed by stir casting technique with commercially pure aluminium as the matrix material and 5, 10 vol.% of SiC (30 ?m) particulates as the reinforcement. Al-SiCp composites were subjected to severe plastic deformation through equal channel angular pressing (ECAP). As cast Al-SiCp composites shows uniform distribution of particles and there is no change in the particle distribution after ECAP. It was found that ECAP refines the grain size of matrix material. In Al-5 vol.% SiCp composite grain size was reduced to 8 ?m from 45 ?m after two ECAP passes whereas in Al-10 vol.% SiCp composite grain size was refined to 16 ?m from 45 ?m after first ECAP pass. Hardness and compression test were conducted at room temperature to evaluate the mechanical properties of the composites. Both the composites exhibit improvement in mechanical properties after ECAP. � 2009 Elsevier Ltd. All rights reserved.
- Published
- 2009
- Full Text
- View/download PDF
12. Effect of nickel coating on bending properties of stereolithography photo-polymer SL5195
- Author
-
Xing Yang Liu and Benli Luan
- Subjects
chemistry.chemical_classification ,Materials science ,prototyping ,Modulus ,coating ,mechanical properties (E) ,Bending ,Polymer ,Substrate (printing) ,engineering.material ,law.invention ,Coating ,Flexural strength ,chemistry ,law ,Nickel coating ,engineering ,Composite material ,Stereolithography ,polymers - Abstract
The effect of nickel coating on the bending properties of Stereolithography (SL) parts was investigated. It was found that a thin layer of nickel coating significantly improves the flexural strength and modulus of the SL specimens. The strengthening effect of the coating is dependent on the ratio of the Young’s moduli of the coating and the substrate materials, as well as the thickness of the coating.
- Published
- 2004
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.