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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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Journal ArticleDOI
TL;DR: In this article, an experimental investigation on the workability behavior of sintered Fe-0.35C steel preforms under cold upsetting, have been studied in order to understand the influence of aspect ratio and lubrication condition on the process.
Abstract: An experimental investigation on the workability behaviour of sintered Fe-0. 35C steel preforms under cold upsetting, have been studied in order to understand the influence of aspect ratio and lubrication condition on the workability process. The above mentioned powder metallurgy sintered preform with constant initial theoretical density of 84% of different aspect ratios, namely, 0. 4 and 0. 6 respectively were prepared using a suitable die-set assembly on a 1 MN capacity hydraulic press and sintered for 90 min at 1 200°C. Each sintered preform was cold upset under nil/no and graphite frictional constraint, respectively. Under the condition of triaxial stress densification state, axial stress, hoop stress, hydrostatic stress, effective stress and formability stress index against axial strain relationship was established and presented in this work. Further more, attained density was considered to establish formability stress index and various stress ratio parameters behaviour.

11 citations

Journal Article
TL;DR: In this article, the applicability of a failure criterion for the strain energy density of rock under static-dynamic loading is proposed, and the critical value of strain energy densities of rock is mainly determined by preceding irreversible deformation process and current environmental state.
Abstract: The applicability of a failure criterion for the strain energy density of rock under static-dynamic loading is proposed. According to the analysis,critical value of strain energy density of rock is mainly determined by preceding irreversible deformation process and current environmental state;and the irreversible deformation is mainly caused by nonelastic deformation,damage and other possible intrinsic dissipative mechanisms of rock in a mechanical system;and volume deformation energy associated with hydrostatic stress effects can not be neglected on some stress states. Using mechanical model to represent the reduction of elasticity,occurrence of inelasticity deformation and effect of loading rate are proposed. On the basis of mechanical model,the critical value of strain energy density of rock under static-dynamic loading is derived. According to the catastrophe model for impact buckling of static-loading structures,a new catastrophe model for impact disturbance fragmentation of a rock system under static loading is established to analyze the rock failure under static-dynamic coupling loading ulteriorly. Finally,by using of the Instron electro-hydraulic and servo-controlled material testing machine and adopting low-cycle-index fatigue loading method,the test of red sandstone failure with medium strain rate under dynamic loading is carried out to verify the strain energy density criterion and catastrophe theory model. There is a good agreement between theoretic and experimental results.

11 citations

Journal ArticleDOI
TL;DR: In this paper, a modified Liu-Murakami creep damage model is used for the creep crack growth (CCG) simulations of several specimens under different loading conditions, and a combined framework of continuum damage mechanics and XFEM is used to predict the CCG life of a turbine blade.
Abstract: Liu–Murakami creep damage model is improved to predict the creep life of various cracked specimens. The modified creep damage law is implemented in the framework of extended finite element method (XFEM) for performing elasto-plastic creep crack growth simulations. Experiments show that the crack tip constraints vary from component to component which leads to variation in crack growth rates. A stress triaxiality function is introduced in the modified Liu–Murakami damage model to address the variation in crack growth rates. Moreover, a new definition of stress triaxiality (ratio of a linear combination of maximum principal stress and hydrostatic stress to von Mises stress) is proposed based on Leckie and Hayhurst failure criterion. The new definition of stress triaxiality is a key parameter in the prediction of time to failure. The modified Liu–Murakami creep damage model is used for the creep crack growth (CCG) simulations of several specimens under different loading conditions. Parametric studies are also performed to study the influence of various parameters on the CCG. Moreover, a combined framework of continuum damage mechanics and XFEM is used to predict the CCG life of a turbine blade. This work establishes that the modified Liu–Murakami creep damage law accurately predicts the creep life of cracked components under different constraint conditions.

11 citations

Journal ArticleDOI
TL;DR: In this article, a micromechanics model and a computational homogenization method were developed to examine the macroscopic elastoplasticity and yield behavior of closed-cell porous materials with varied inner gas pressures.

11 citations

Journal ArticleDOI
TL;DR: In this paper, an attempt has been made to establish a relationship between the approaching angle and protrusion height and to establish the relationship among various height strains and stress ratio parameters, and the relationship was also established between the various bulge parameters namely the hoop stress, the hydrostatic stress and the stress ratio parameter.

11 citations


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