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Elastic modulus
About: Elastic modulus is a research topic. Over the lifetime, 33153 publications have been published within this topic receiving 810247 citations.
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TL;DR: In this article, the elastic modulus data calculated from indentation load-displacement experiments are comparable with those obtained from dynamic mechanical analysis and the tensile tests, and the creep behavior of the nanocomposites shows an unexpected increasing trend as the clay loading increases.
168 citations
TL;DR: In this article, the relationship between the finite tip radius and compressibility of the specimen is examined and a composite correction factor that involves both factors, derived, is found to be a function of indentation depth and a critical depth beyond which, the arbitrary finite-tip radius effect is insignificant.
168 citations
TL;DR: In this paper, the Young's modulus, strength and fracture toughness of a brittle reticulated vitreous carbon foam was measured as a function of cell size at a constant density and compared to a theoretical model.
Abstract: The Young's modulus, strength and fracture toughness, of a brittle reticulated vitreous carbon foam, was measured as a function of cell size at a constant density and compared to a theoretical model Image analysis was used to characterize the macrostructure of the samples and provided a basis for evaluating the mechanical behavior It was determined that both the compressive and bend strength scale inversely with cell size The change in compressive strength is due to a change in the strut strength with cell size The bend strength behavior may be due to a reduction in the critical flaw size, as well as the increasing strut strength at smaller cell sizes The fracture toughness and elastic modulus were found to be independent of cell size Comparison of these results with previous work on open cell alumina clearly indicates a very different behavior and is attributed to a change in the microstructure of the solid phase with cell size in the alumina materials
168 citations
TL;DR: In this article, in-plane residual stresses in EB-PVD thermal barrier coatings (TBCs) were characterized by the change in substrate curvature upon coating removal, and inplane elastic moduli were measured from the resonant frequency of the coating-substrate system.
Abstract: Residual stresses develop in coatings during deposition and can have a large impact on coating mechanical properties and durability. In this study, in-plane residual stresses in Electron beam–physical vapor deposited (EB–PVD) thermal barrier coatings (TBCs) were characterized by the change in substrate curvature upon coating removal, and in-plane elastic moduli were measured from the resonant frequency of the coating–substrate system. Variations in deposition conditions were observed to produce in PVD TBCs a wide range of stress levels, between −70 and 20 MPa. The residual stress was observed to be correlated strongly with the in-plane elastic modulus. A significant difference in the in-plane elastic modulus was measured along different directions of PVD TBC specimens fabricated by rotating the specimens over the evaporation source. The elastic modulus in the direction perpendicular to the axis of rotation was always significantly lower than the modulus measured along the axis of rotation. The elastic modulus measured perpendicular to the axis of rotation was associated with compliant microstructural features produced by the rotation of the substrate over the melt pool. Strain tolerance was measured directly by a new mechanical test that measured the strain at delamination of a coating from an edge-initiated crack from a substrate that was loaded in compression. The strain tolerance of the coating decreased with increasing residual stress.
168 citations
TL;DR: In this article, the effect of contact flattening and material properties on the fracture stress calculation for the diametrical compression test used to evaluate compact strength was examined through finite element simulations using linear elastic, elastoplastic, and porous elastplastic models with commercial finite element software.
Abstract: The effect of contact flattening and material properties on the fracture stress calculation for the diametrical compression test used to evaluate compact strength was examined through finite element simulations Two-dimensional simulations were carried out using linear elastic, elastoplastic, and porous elastoplastic models with commercial finite element software A parametric study was performed by varying the elastic modulus (E), Poisson's ratio (ν), contact frictional coefficient (μ), yield stress (σyield), and compact relative density (RD) Stress contours generated from these simulations were compared to the Hertzian and Hondros analytical expressions Linear elastic simulations show excellent agreement with the analytical solutions Significant deviation, however, occurs for the elastoplastic and porous elastoplastic simulations at larger diametrical strain with material plasticity A better understanding of the stress-state of diametrically loaded plastically deforming disks has been demonstrated in this computational and experimental work Results from these finite element simulations confirm that the standard tensile strength calculation: σf = 2P/π Dt, is suitable for linear elastic materials However, the incorporation of plasticity into the material model results in a significant change in the maximum principal stress field (magnitude and location) rendering the Hertzian estimate of tensile strength invalid A map to check the validity of the Hertzian equation is proposed
168 citations