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Hydrostatic stress
About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.
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TL;DR: In this article, the effect of induced α-marsensite transformation on local diffusion of hydrogen around a loaded crack tip has been intuitively demonstrated, and the authors reveal the quantitative relations of hydrogen diffusivity and solubility with induced α′ martensite amount, and then perform FE analysis of hydrogen diffusion around a crack tip in a 304L ASS cylinder storing high pressure gaseous hydrogen with considering the combined effect of α- marsenite transformation and hydrostatic stress on diffusion.
34 citations
TL;DR: In this paper, the authors present the possibility of combining the use of an experimental device, which strokes the tensile-shear loading combination, to model the behavior of the adhesive in a bonded assembly accurately under realistic loadings.
Abstract: Generally, adhesives are viscoelastic–plastic materials, for which the development of viscosity and plasticity varies depending on the type of adhesive and the stress state. Various models exist to represent the yield surface, or the so-called elastic limit, taking into account the two stress invariants, hydrostatic stress and von Mises equivalent stress. Moreover, to develop precise pressure-dependent constitutive models, it is necessary to have a large experimental database in order to accurately represent the adhesive strains which are strongly dependent on the tensile-shear loading combination. Under quasi-static loadings, for a given strain rate range viscous effects can be neglected, but only a few experimental results are available to model the behaviour of the adhesive in a bonded assembly accurately under realistic loadings. Moreover, edge effects often have a large influence on the mechanical response. This paper presents the possibility of combining the use of an experimental device, which stro...
34 citations
TL;DR: In this paper, a new experimental protocol to evaluate long-term, plasticity-controlled failure using short-term testing is validated on a high-density polyethylene (PE100) pipe grade.
Abstract: In this study, a new experimental protocol to evaluate long-term, plasticity-controlled failure using short-term testing is validated on a high-density polyethylene (PE100) pipe grade. The protocol starts with the assessment of the strain rate dependence of the yield stress in uniaxial extension at various temperatures. Additional uniaxial compression tests are performed to characterize the influence of hydrostatic stress. The plastic flow kinetics are subsequently captured using a Ree-Eyring modification of the pressure-modified Eyring flow equation. In combination with the hypothesis that failure occurs at a critical amount of accumulated plastic strain, a versatile tool to predict time-to-failure is obtained. POLYM. ENG. SCI., 56:676–688, 2016. © 2016 Society of Plastics Engineers
34 citations
TL;DR: In this paper, the scaling laws for tensors with self-similar structure were determined using the differential self-consistent method, where the scaling is represented by power laws with the exponents determined by the microstructure, but not necessarily by the material fractal dimension.
34 citations
TL;DR: In this paper, the applicability of the irreversible thermodynamics theory to the modeling of elastic-plastic-damage materials is discussed, and the existence and the development of the damage surface, together with the condition of loading, unloading and neutral loading, are elucidated to facilitate the identification of the fundamental aspects of thermodynamic theory of the material.
Abstract: Damage evolution and fundamental aspects of damage surface of a spheroidized graphite cast iron are observed. This paper is intended to discuss the applicability of the irreversible thermodynamics theory to the modeling of elastic-plastic-damage materials. By performing damage tests on the tubular specimens of the material under proportional and nonproportional loading, onset and development of material damage are first detected by measuring Acoustic Emission (AE) counts. The change in Young's modulus, Poisson's ratio and shear modulus is also observed in the tests to correlate them with the damage development in the material. The existence and the development of the damage surface, together with the condition of loading, unloading and neutral loading, are elucidated to facilitate the identification of the fundamental aspects of thermodynamics theory of the elastic-plastic-damage materials. The effects of the hydrostatic stress on the deformation and damage equations are also discussed.
34 citations