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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 paper, two approaches, namely, two-parameter fracture mechanics and micro-mechanical models are considered to investigate the feasibility of transferability of fracture parameters, and it is shown that if the triaxial conditions match for any two arbitrary geometries, it is feasible to transfer the fracture parameters.
45 citations
TL;DR: In this paper, an analysis of high cycle multiaxial fatigue behavior is conducted through numerical simulation of polycrystalline aggregates using the finite element method, where the aggregates are loaded at levels equivalent to the average macroscopic fatigue strength at 10 7 cycles.
45 citations
TL;DR: In this article, the residual stresses in zirconia toughened alumina (ZTA) composites, containing 1.7, 14 and 22 vol% yttria-stabilized ZIRconia (3Y-TZP) were obtained by neutron diffraction.
Abstract: Measurements of the residual stresses in zirconia toughened alumina (ZTA) composites, containing 1.7, 14 and 22 vol% yttria-stabilized zirconia (3Y–TZP) were obtained by neutron diffraction. Over the range of volume fraction investigated, the hydrostatic stress in alumina and zirconia phases varies roughly linearly with the zirconia content. It is shown that these features can be qualitatively understood by taking into consideration the thermal expansion mismatch between the ZrO 2 and Al 2 O 3 grains. In addition, a decrease of the Al 2 O 3 line broadening is observed, which implies a decreasing micro-residual strain due to the ZrO 2 particles in the alumina. It is inferred that the residual strain field is highly hydrostatic, and that a decrease of the grain boundary shear stress occurs as a function of the reinforcement volume fraction. This phenomenon is more important in the case of 1.7 vol% zirconia composite because the zirconia particles are in the nanometre size range, with a narrow distribution.
45 citations
TL;DR: In this paper, the thermodynamics of a two component system of metal-hydrogen, oriented towards obtaining a suitable relationship for the evaluation of the mobile component (H), in presence of an externally applied uniform hydrostatic stress field has been considered in detail.
45 citations
TL;DR: In this article, the effects of the deformation behaviors of individual phases in Ti alloys with a duplex microstructure containing a mixture of primary α grains and lamellar α+β colonies have been analyzed by applying the finite element method (FEM) to the relevant micro-structure.
Abstract: The effects of the deformation behaviors of individual phases in Ti alloys with a duplex microstructure containing a mixture of primary α grains and lamellar α + β colonies have been analyzed by applying the finite-element method (FEM) to the relevant microstructure. The softer primary α grains and the harder lamellar α + β colonies are treated as distinct microstructural units with different constitutive properties. The FEM results indicate that the softer (primary α) phase, which reaches yielding first, tends to concentrate both the plastic strain and the hydrostatic stress, whose magnitudes depend on the volume fraction of the primary α grains and the load levels. The insight from the FEM analyses has been used to modify the linear relation between alternating stress and mean stress in a Haigh or modified Goodman diagram by incorporating a microstructure-induced hydrostatic stress term, leading to a set of bilinear relations for high-cycle fatigue (HCF) failures of Ti alloys with a duplex microstructure. The applicability of the micromechanical approach to treating the mean stress effects in HCF failure of Ti-6Al-4V with various duplex microstructures is elucidated by comparison against experimental data in the literature.
44 citations