scispace - formally typeset
Search or ask a question
Topic

Hydrostatic stress

About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.


Papers
More filters
01 Jan 1992
TL;DR: In this article, the analytic solutions of plane-stress mode I perfectly-plastic near-tip stress fields for pressure sensitive materials are derived, which correspond to the limit of low-hardening solutions, and when /~ = 0 it reduces to the perfectly plastic solution for the Mises material given by Hutchinson.
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 pressure- sensitive materials are derived. Also, the relevant characteristic fields are presented. This perfectly plastic solution, containing a pressure sensitivity parameter #, is shown to correspond to the limit of low-hardening solutions, and when /~ = 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.

1 citations

Proceedings ArticleDOI
01 Jan 2005
TL;DR: In this paper, a tensile test which maximizes the effects of hydrostatic constraint on a bar made of an elastic, perfectly plastic material is presented. But the model used in this case is a simplified version of the MPC Omega model, described in API 579 [1].
Abstract: This paper describes part of an ongoing study to develop a simple tensile test which will maximize the effects of hydrostatic constraint. The test for such purposes is the notched bar test. Two notch geometries are in common use, the ASTM Standard notch, and the Bridgman blunt notch. Both of these tests have shortcomings, which are described in the paper. Alternative geometries, including notches, plane strain holes and slots have been evaluated, using the ratio of hydrostatic stress to Mises stress in a bar made of an elastic, perfectly plastic material. Examples are given of the stress evolution in selected geometries under creep according to a simple Bailey/Norton power law model, and comparison is made with the behavior when a more complex material constitutive law is used, which includes continuum creep damage. The model used in this case is a simplified version of the MPC Omega model, described in API 579 [1]. Since creep calculations involving damage are both computationally intensive and difficult to carry to completion due to numerical convergence problems, approximate methods of predicting specimen behavior under such complex material conditions is being explored. One promising method, based on isochronous stress/strain curves is described and the results compared with detailed predictions using a more accurate constitutive model.Copyright © 2005 by ASME

1 citations

01 Jan 1972
TL;DR: In this paper, a finite element analysis of an elliptical cavity in geological media under internal pressure and in situ stress was conducted using finite element analyzer, and failure or instability in the cavities was studied in terms of failure initiation, where suitable maximum tensile strain and maximum shear strain criteria were formulated and used to indicate failure initiation.
Abstract: Plane strain stress distribution and stability analysis of an elliptical cavity in geological media under internal pressure and in situ stress was conducted using finite element analysis. The investigation was conducted for infinite isotropic and transversely isotropic elastic continuum and infinite elastic-elastoplastic isotropic continuum bearing linear (Coulomb) or nonlinear (Torre) forms of Mohr-Coulomb yield envelopes. Both these envelopes are sensitive to hydrostatic stress and neglect the effects of intermediate principal stress. Incremental constitutive relations were used in the elastic-plastic analysis. Failure or instability in the cavities was studied in terms of failure initiation. Suitable maximum tensile strain and maximum shear strain criteria were formulated and used to indicate failure initiation. One of the more significant results was that an elliptical cavity would be unstable both above and below certain critical internal pressures. (37 refs.)

1 citations

Journal ArticleDOI
TL;DR: In this paper, an axisymmetric finite element model was created using ABAQUS software to study the evolution of the ductile damage in the process of sheet metal semicutting.
Abstract: An axisymmetric finite element model was created using ABAQUS software to study the evolution of the ductile damage in the process of sheet metal semicutting. A modified Gurson–Tvergaard–Needleman (GTN) porous material model and a modified Rice–Tracey ductile fracture model which takes into account the influence of stress triaxiality and deviatoric stress tensor on material damage, were introduced and the improvements of them were verified based on a single element uniaxial tension test and different tensile tests with notched specimens. After that, both of them were used for elastoplastic sheet metal semicutting analysis. By analysing the distributions of hydrostatic stress, equivalent stress, equivalent strain, stress triaxiality and fracture of sheet metal in the process of semicutting parts based on simulation and the corresponding experimental results, some phenomenon related to void nucleation, growth and coalescence in the sheet metal semicutting process was discussed.

1 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a damage mechanics approach to determine the multiaxial stress parameter that most accurately characterizes the stresses driving crack tip damage in 304 stainless steel specimens.
Abstract: High-temperature crack growth experiments have been conducted with 304 stainless steel specimens under mode I, mode II, and mixed-mode conditions. Crack growth rate and direction data for three different mixed-mode loadings have been analyzed to investigate the factors that control crack growth under mixed-mode conditions. The value of C* was calculated for mode mixities ranging from pure tensile to pure shear loading at the crack tip using a reference stress approach. Effective values of C* based on a damage mechanics approach were then calculated in an attempt to determine the multiaxial stress parameter that most accurately characterizes the stresses driving crack tip damage. The hydrostatic stress was found to be the stress parameter that best correlates the crack growth rate data for mode I, mode II, and mixed-mode loading conditions. The angle of growth for the mode I and mixed-mode conditions appears to be governed by both the maximum principal stress and the hydrostatic stress. However, the lack of tensile loads for mode II loading results in crack growth that is nearly collinear with the notch corresponding to the position of the maximum effective stress. Overall, the present results indicate that the hydrostatic stress is the most valid multiaxial stress parameter for predicting high-temperature crack growth in the present material under mixed-mode conditions.

1 citations


Network Information
Related Topics (5)
Fracture mechanics
58.3K papers, 1.3M citations
86% related
Ultimate tensile strength
129.2K papers, 2.1M citations
84% related
Finite element method
178.6K papers, 3M citations
83% related
Grain boundary
70.1K papers, 1.5M citations
78% related
Microstructure
148.6K papers, 2.2M citations
78% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202246
202134
202047
201948
201839