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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors derived two cases of a simplified representation of mechanical deformations in a coupled hydro-thermal model and demonstrated the exact coincidence of THM and modified THM formulations in isotropic and orthotropic materials as long as the basic assumptions like constant hydrostatic stress conditions or uniaxial strain hold.

6 citations

Journal ArticleDOI
F. Z. Li1
TL;DR: In this paper, the analytic solutions of plane-stress mode I perfectly-plastic near-tip stress fields for pressuresensitive materials are derived. And the effects of material pressure sensitivity on the near tip fields are discussed.
Abstract: Different from dense metals, many engineering materials exhibit pressure-sensitive yielding and plastic volumetric deformation. Adopting a yield criterion that contains a linear combination of the Mises stress and the hydrostatic stress, the analytic solutions of plane-stress mode I perfectly-plastic near-tip stress fields for pressuresensitive materials are derived. Also, the relevant characteristic fields are presented. This perfectly plastic solution, containing a pressure sensitivity parameter μ, is shown to correspond to the limit of low-hardening solutions, and when μ=0 it reduces to the perfectly plastic solution of near-tip fields for the Mises material given by Hutchinson [1]. The effects of material pressure sensitivity on the near-tip fields are discussed.

6 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the evolution of the densification process of porous continua subjected to a unidirectional compression by using limit analysis approach, which leads to bounds for the loading path.
Abstract: The objective of this work is to examine (by experiments and associated limit analysis approximations) the evolution of the densification process of porous continua subjected to a unidirectional compression. The problem is treated by the limit analysis approach, which leads to bounds for the loading path. The formulation is based on (and compared with) the various modifications of Gurson's yield function. However, rather than using 'effective properties' of the bulk, the spatial distributions (of the density, of the hydrostatic pressure, etc.) are preserved, along with their time-like progression during the considered nonsteady process. An admissible velocity field is assumed for the bulk material and it is used to find the constitutive response of the material to the densification. Concurrently, an admissible yielding stress field is employed for providing a rigorous lower bound analysis and for assessing the effect of hydrostatic stress on the plastic flow used in the upper bound analysis. The combination of the two admissible fields is shown to provide a satisfactory engineering tool, to predict what should be the loading path for performing the densification, regardless of the actual mechanism by which the densification process is evolved. The suggested procedure is compared to experiments with various sintered powder materials.

6 citations

Journal ArticleDOI
TL;DR: In this paper, the SiN-induced variations in solid phase epitaxy (SPE) rates arise both from line-edge stresses, which scale with feature stress and increase SPE rates where the hydrostatic stress is compressive, and a SiN body effect, which suppresses SPE rate under SiN features, independent of SiN stress state.
Abstract: Striking nonuniformities are observed in the solid phase epitaxy (SPE) of blanket amorphized Si layers recrystallized in the presence of stress distributions induced by a patterned SiN overlayer. Measurements conducted for a range of SiN feature sizes and intrinsic stress values allowed us to isolate the effects of stress on the crystallization front. It is concluded that SiN-induced variations in SPE rates arise both from line-edge stresses, which scale with feature stress and increase SPE rates where the hydrostatic stress is compressive, and a SiN body effect, which suppresses SPE rates under the SiN features, independent of SiN stress state.

6 citations

Journal ArticleDOI
TL;DR: In this article, a viscoplastic constitutive equation based on a potential function is proposed to predict the mechanical response of an epoxy matrix to any three-dimensional loading condition.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202246
202134
202047
201948
201839