Topic
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 paper, a numerical framework is developed to study hydrogen embrittlement and a hydrogen diffusion equation is derived, and a trapping density function is proposed in the framework of the phase field model, where the effect of hydrogen enhanced localized plasticity and hydrogen enhanced decohesion (HEDE) are modeled by reducing the yield stress and decreasing the critical energy release rate respectively.
21 citations
TL;DR: In this article, a multiaxial model for fatigue life estimation, formulated in terms of a piecewise ruled S-N surface, is proposed, which considers the sum of a deviatoric stress amplitude and the maximum hydrostatic stress as an exponential function of the number of cycles to failure.
21 citations
TL;DR: In this article, the authors deal with experimental derivation of friction factor values m for different lubricants and their combinations using ring compression tests and standard ring geometry 6:3:2.
Abstract: This work deals with experimental derivation of friction factor values m for different lubricants and their combinations using ring compression tests and standard ring geometry 6:3:2. The values thus obtained were used to generate data on cold upsetting of annealed aluminium solid cylinders. Two aspect ratios and three strain levels were considered for the upsetting experiment. Calculations were made with the assumption that the curvature of the bulge followed a circular arc. The measured radius of curvature of the bulge was shown to agree with the value calculated using experimental data. Relationships were established between various bulge parameters such as new hoop strain, hydrostatic stress, geometrical shape factor, and stress ratio factor, and the friction factor m of different lubricants.
21 citations
TL;DR: In this paper, a simple cell model based damage dependent yield surface is used to model the effect of void nucleation and growth in an aluminum alloy during an axisymmetric cold extrusion process.
21 citations
TL;DR: In this paper, the boundary perturbation method is used to solve the problem of a nearly circular rigid inclusion in a two-dimensional elastic medium subjected to hydrostatic stress at infinity, and the solution is taken to the fourth order in the small parameter epsilon that quantifies the magnitude of the variation of the radius of the inclusion.
Abstract: The boundary perturbation method is used to solve the problem of a nearly circular rigid inclusion in a two-dimensional elastic medium subjected to hydrostatic stress at infinity. The solution is taken to the fourth order in the small parameter epsilon that quantifies the magnitude of the variation of the radius of the inclusion. This result is then used to find the effective bulk modulus of a body that contains a dilute concentration of such inclusions. The corresponding results for a cavity are obtained by setting the Muskhelishvili coefficient K equal to -1, as specified by the Dundurs correspondence principle. The results for nearly circular pores can be expressed in terms of the pore compressibility. The pore compressibilities given by the perturbation solution are tested against numerical values obtained using the boundary element method, and are shown to have good accuracy over a substantial range of roughness values.
21 citations