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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, it is shown that as the distance from the boundaries increases the solving in the frame of asymmetric stress model, the problem is not solved in the case of symmetric stress and couple stress model.
Abstract: There is mased differences between experimental and analytical results in the frame of symmetric stress model,when the notable stress gradient exist,or outstanding microstructure is to be considerated,or wavelength is too shorter in dynamic problems Other difficulty is introduced in linear elastic statics of homogeneous isotropic solid thatThe problem is that,neighbor boundaries of a angle domain are subjected to two shear forces not equal each other The problem is not solved in the frame of symmetric stress model In the frame of the asymmetric stress and couple stress model in present paper this difficulty is sovlved It is show that,as the distance from the boundaries increase the solving in the frame of asymmetric stress model tent to that in the frame of symmetric stress model
2 citations
TL;DR: In this paper, the authors consider the material as a porous medium in which the effect of voids on the stress-strain state and plastic flow cannot be neglected, and they show that the hydrostatic stress component influences the plastic flow of the material.
Abstract: Ductile fracture process includes three stages: void nucleation, their growth and coalescence. The voids nucleate due to the fracture or separation of non-metallic inclusions and secondary-phase particles from the material matrix. Micromechanical models based on the Gurson plastic flow criterion are often used for analysis of ductile fracture. They consider the material as a porous medium in which the effect of voids on the stress-strain state and plastic flow cannot be neglected. Another important property of the Gurson criterion is that the hydrostatic stress component influences the plastic flow of the material.
2 citations
01 Jan 1983
TL;DR: In this article, a general yield condition for anisotropic ductile porous materials is developed employing the tensor functions representations, and specific forms of yield criteria for simple stress states are discussed and necessary measurements are proposed to determine the material constants.
Abstract: In the paper a general yield condition for anisotropic ductile porous materials is developed employing the tensor functions representations. It is assumed that directional mechanical properties of a porous material are described by the structural permeability second order tensor. Such procedure enables us to disclose rotation and translations of the yield surface to shear and hydrostatic stress axes. The isotropic case is analysed in detail. Specific forms of yield criteria for simple stress states are discussed and the necessary measurements are proposed to determine the material constants.
2 citations
Posted Content•
TL;DR: In this article, the influence of thermomechanical loads on the growth of precipitation in magnesium-aluminum alloys has been investigated using Density functional theory simulations, and expressions of the energy of binary solid solutions as a function of concentration, strain and temperature have been derived.
Abstract: We use first principles calculations to study the influence of thermomechanical loads on the energetics of precipitation in magnesium-aluminum alloys. Using Density Functional Theory simulations, we present expressions of the energy of magnesium-aluminum binary solid solutions as a function of concentration, strain and temperature. Additionally, from these calculations, we observe an increase in equilibrium volume (and hence the equilibrium lattice constants) with the increase in concentration of magnesium. We also observe an increase in the cohesive energy of solutions with increase in concentration, and also present their dependence on strain. Calculations also show that the formation enthalpy of $\beta$ phase solutions to be strongly influenced by hydrostatic stress, however the formation enthalpy of $\alpha$ phase solutions remain unaffected by hydrostatic stress. We present an expression of the free energy of any magnesium aluminum solid solution, that takes into account the contributions of strain and temperature. We note that these expressions can serve as input to process models of magnesium-aluminum alloys. We use these expressions to report the influence of strains and temperature on the solubility limits and equilibrium chemical potential in Mg-Al alloys. Finally, we report the influence of thermomechanical loads on the growth of precipitates, where we observe compressive strains along the $c$ axis promotes growth, whereas strains along the $a$ and $b$ directions do not influence the growth of precipitates.
2 citations
01 Jan 2011
TL;DR: In this article, the authors visualize the evolution of the principal stress and strain vectors near a weld pool using Gauss points on the flow line of a material point that passes near the weld pool.
Abstract: By getting the data from an ordered set of Gauss points on the flow line of a material point that passes near the weld pool, the evolution of the stress/strain tensor fields is visualized. The principal plastic strain tensor, principal deviatoric stress tensor, hydrostatic stress and temperature are visualized. This is done for three weld distortion mitigation strategies: i) pre-bending by applying a prescribed displacement, ii) applying a tensile load to the weld and iii) applying side heaters to the weld. Visualizing the evolution of the principal stress and strain vectors gives interesting insight into the mechanics of plastic deformation near a weld pool.© 2011 ASME
2 citations