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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01 Aug 1975
TL;DR: In this article, the authors used step height measurements to estimate swelling and creep coupling coefficients derived from fission reactor data, and showed that the swelling is fully anisotropic, two-thirds of the deformation having been diverted from directions normal to the ion beam.
Abstract: Ion bombardment is employed to simulate the neutron damage that will occur in fusion reactor structural materials. These experiments usually involve specimens whose thickness is large compared to the ion range. The correct interpretation of such experiments requires inclusion of the impact of swelling- induced stresses, which arise from the rigidity of the non-swelling region beyond the ion range. An initial low level of swelling is accommodated by elastic compression of the voided region, giving rise to anisotropic stresses whose deviatoric components lead to plastic deformation by various irradiation creep mechanisms. Swelling generates the stresses which lead to creep, which in turn limits the magnitude of stress. The hydrostatic stress along the ion range eventually saturates at a level which reduces the swelling rate from the anticipated stress-free value. The swelling is fully anisotropic, two-thirds of the deformation having been diverted from directions normal to the ion beam. Crystalline anisotropy further modifies the relative rates of creep processes, and radiation-hardening of the lattice imposes an additional fluence dependence. Stress reversal at denuded zones leads to second-order stress effects. The use of step height measurements allows observation and measurement of these phenomena. Estimates of the stress levels and swelling rates canmore » be made using swelling and creep coupling coefficients derived from fission reactor data. A significant reduction in swelling rate is predicted by this analysis. (auth)« less
9 citations
TL;DR: In this article, the authors analytically relate hydrostatic stress to strain in a random dense pack of identical spheres cemented at their contacts, and show that, as loading increases and cement becomes plastic, a finite (Hertzian) direct contact area between the spheres necessarily has to develop and progress.
9 citations
TL;DR: In this article, a unified theory is proposed that captures not only such time-dependent phenomena as creep, stress relaxation and rate sensitivity but also demonstrates a sensitivity to hydrostatic stress, which assures the inelastic boundary value problem is well posed with unique solutions.
9 citations
TL;DR: In this article, the authors performed constant displacement loading tests using wedge opening loading specimens in aqueous hydrogen sulfide solution containing sodium chloride to investigate the susceptibility of stress corrosion cracking (SCC) of FV520B precipitation hardening martensitic stainless steel.
9 citations
TL;DR: In this article, a multi-axial continuum damage mechanics (CDM) model was proposed to calculate the multaxial creep-fatigue damage of a high temperature component, and the interaction of the creep and fatigue behavior of the outer cylinder was numerically investigated under a startup-running-shutdown process.
Abstract: A multi-axial continuum damage mechanics (CDM) model was proposed to calculate the multi-axial creep–fatigue damage of a high temperature component. A specific outer cylinder of a 1000 MW supercritical steam turbine was used in this study, and the interaction of the creep and fatigue behavior of the outer cylinder was numerically investigated under a startup–running–shutdown process. To this end, the multi-axial stress–strain behavior of the outer cylinder was numerically studied using Abaqus. The in-site measured temperatures were provided to validate the heat transfer coefficients, which were used to calculate the temperature field of the outer cylinder. The multi-axial mechanics behavior of the outer cylinder was investigated in detail, with regard to the temperature, Mises stress, hydrostatic stress, multi-axial toughness factor, multi-axial creep strain, and damage. The results demonstrated that multi-axial mechanics behavior reduced the total damage.
9 citations