The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform
J. S. Burnell-gray - One of the best experts on this subject based on the ideXlab platform.
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Effects of surface modification of fumed silica on interfacial structures and mechanical properties of poly(vinyl chloride) composites
European Polymer Journal, 2006Co-Authors: Shuisheng Sun, Ling Zhang, J. S. Burnell-grayAbstract:Abstract Poly(vinyl chloride) (PVC)-based composites were prepared by blending PVC with nano-SiO 2 particles, which were treated with dimethyl dichlorosilane (DMCS), γ-methylacryloxypropyl trimethoxy silane (KH570). The dispersion and interfacial compatibility of nano-SiO 2 particles in PVC matrix was characterized by SEM, which indicated that DDS had a better dispersion and compatibility than UTS but worse than KHS. The mechanical properties, processability and effective interfacial interaction of nano-SiO 2 /PVC composites were studied. The nano-SiO 2 particles treated with KH570 or DMCS significantly reinforced and toughened the PVC composites. The maximum impact strength of PVC composites was achieved at a weight ratio of nano-SiO 2 /PVC:4/100. The Tensile Yield Stress increased with increasing the content of treated inorganic particles. The incorporation of untreated nano-SiO 2 particles adversely affected the Tensile strength of the composite. Although the equilibrium torques of all nano-SiO 2 /PVC composites were higher than that of pure PVC, the surface treatments did reduce the equilibrium torque. The interfacial interaction parameter, B , and interfacial immobility parameter, b , calculated respectively from Tensile Yield Stress and loss module of nano-SiO 2 /PVC composites, were employed to quantitatively characterize the effective interfacial interaction between the nano-SiO 2 particles and PVC matrix. It was demonstrated that the nano-SiO 2 particles treated with KH570 had stronger effective interface interaction with PVC matrix than those treated with DMCS, which also had stronger effective interface interaction than the untreated nano-SiO 2 particles.
T. Jamiru - One of the best experts on this subject based on the ideXlab platform.
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Calculation of creep curves from Tensile Yield Stress measurements on a low alloy steel
Materials Science and Technology, 2004Co-Authors: H. D. Chandler, T. JamiruAbstract:AbstractFor many applications, it may be useful to be able to estimate creep properties of a material from simpler testing procedures such as Tensile tests. Most alloys used for creep service conditions are in a hardened condition and thus tertiary creep, controlled by microstructural degradation, is dominant. This paper presents some results on calculating creep curves from Tensile test results from a low alloy steel. Tensile tests at different temperatures and strain rates were used to determine material parameters for use in kinetic equations describing deformation. Tests on furnace aged specimens were used to quantify softening owing to material degradation and formulate a structure evolution expression. This, together with the kinetic equation, was used to determine creep curves.
Soumitra Tarafder - One of the best experts on this subject based on the ideXlab platform.
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Cyclic plastic deformation and damage in 304LN stainless steel
Materials Science and Engineering: A, 2011Co-Authors: Surajit Kumar Paul, S. Sivaprasad, Sankar Dhar, Soumitra TarafderAbstract:304LN stainless steel samples are tested in room temperature under low cycle fatigue (LCF), ratcheting, pre-ratcheting followed by LCF and Tensile, and pre-LCF followed by Tensile conditions to understand the deformation behavior and damage evolution during cyclic plastic deformation. It is found that pre-ratcheting have massive detrimental effect on its subsequent LCF life. Systematic alterations in Tensile properties are noticed with cyclic plastic damage evolution in this work. Orderly alteration of Tensile Yield Stress with cyclic hardening/softening of the material is also observed.
Qing Liu - One of the best experts on this subject based on the ideXlab platform.
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Effect of grain size, texture and density of precipitates on the hardness and Tensile Yield Stress of Mg-14Gd-0.5Zr alloys
Materials & Design, 2017Co-Authors: Renlong Xin, Qing Liu, Adrien Chapuis, Shifeng Liu, Lin ZongAbstract:Abstract In this study, an age-hardenable Mg–14Gd–0.5Zr (wt.%) alloy was used as a model material to investigate the effects of grain size, texture and density of precipitates on the hardness and 0.2% proof Tensile Yield Stress. Six kinds of samples with different grain size, texture and density of precipitates were prepared by varying the extrusion process and aging treatment. The microstructure and texture of the samples were examined by electron backscatter diffraction and transmission electron microscope. The examination results indicate that 0.2% proof Yield Stress of the Mg-Gd alloys were largely affected by the grain size and texture, while the hardness of the alloys was predominately controlled by the density of precipitates. This study reveals that the grain size, texture and density of precipitate can have much different influences on the hardness and 0.2% proof Yield Stress for the Mg-Gd alloys. It raises an important issue about the mechanical-testing standards and product-design guidelines for the age-hardenable magnesium alloys.
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Mechanical behavior and microstructural characteristics of magnesium alloy containing {10-12} twin lamellar structure
Journal of Materials Research, 2012Co-Authors: Chao Lou, Xiyan Zhang, Runhong Wang, Qing LiuAbstract:A hot-rolled AZ31 Mg alloy sheet was subjected to dynamic plastic deformation parallel to the rolling direction with the aim of introducing {10-12} twins. Subsequent Tensile tests were carried out along the predeformed direction and the initial transverse direction (TD). It was found that untwinning led to a significant drop in Yield Stress when tension is carried out along the predeformed direction. And {10-12} twins and strain caused by twinning were recovered by untwinning. The Tensile Yield Stress increased slightly with prestrain was correlated with the texture hardening caused by untwinning. When tension is carried out along initial TD, {10-12} twinning activity was restrained and slip dominated plastic deformation. The Tensile Yield Stress increased significantly with prestrain was strongly correlated with the hardening contributions of {10-12} twins. {10-12} twinning led to the obvious Yield Stress in-plane anisotropy but had little effect on the maximum flow Stress.
Yaniv Gelbstein - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the mechanical properties of SS-316L thin foils by small punch testing and finite element analysis
Materials & Design, 2015Co-Authors: S. Haroush, E. Priel, D. Moreno, A. Busiba, I. Silverman, A. Turgeman, Roni Z. Shneck, Yaniv GelbsteinAbstract:Abstract Thin foils having thickness values of 200 μm and less are commonly applied in the food industries, medical applications and more. Small punch technique (SPT) is a promising mechanical testing method for specimens thicker than 250 μm, in which a formulation correlating the measured parameters to standard Tensile properties was previously reported. The current research is focused, for the first time, on the correlation between SPT and Tensile mechanical properties of SS-316L thinner specimens in the range of 100–200 μm. It is demonstrated by finite-element-analysis, that the mechanical response of thin foils having thicknesses in the range of 25–500 μm can be divided into three categories. For specimens thicker than 300 μm, thin plate bending equations that were applied previously for thick specimens, are still valid, while for thinner specimens this theory fails to provide adequate correlation between SPT and Tensile Yield Stress. For specimens thinner than 50 μm it was identified that equations derived from membrane solution should be employed rather than classical plate theory. For intermediate thickness values in the 50–300 μm range, a “transition-zone” was identified between plate and membrane-like mechanical responses. For the lower region, 50–100 μm, an analytical expression correlating the measured SPT parameters and the Tensile Yield Stress is currently proposed.
