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 published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors discussed natural stress field variation with depth and showed that failure is only possible at the increased lateral earth pressure coefficients, which induce hydrostatic stress redistribution at great depths.
Abstract: The article discusses natural stress field variation with depth. Rocks are assumed to be elastic. Increase in the stress level results in higher principal shear stresses but causes no failure. It is stated that failure is only possible at the increased lateral earth pressure coefficients, which induce hydrostatic stress redistribution at great depths. It is shown that Poisson’s ratio tends to 1/2 in isotropic rock mass.
1 citations
01 Jan 1992
TL;DR: In this paper, the effect of imposed strain rate on the initiation of debonding is analyzed numerically for rigid spherical inclusions in an elastic-viscoplastic matrix subject to uniaxial tension with a superposed hydrostatic stress.
Abstract: The effect of imposed strain rate on the initiation of debonding is analyzed numerically for rigid spherical inclusions in an elastic-viscoplastic matrix subject to uniaxial tension with a superposed hydrostatic stress. The analyses are based on a cohesive zone type model that permits the prediction of interfacial decohesion without the necessity of introducing some additional failure criterion. Since the mechanical response of the interface is specified in terms of both a critical interfacial strength and the work of separation per unit area, dimensional considerations introduce a characteristic length. For the conditions analyzed, the strain rate dependence of the debonding initiation strain is found to increase with increasing inclusion size.
1 citations
01 Jan 2003
TL;DR: In this article, a natural orthogonal coordinate system was developed using lines of constant hydrostatic stress together with those of its complex conjugate function for plane problems, which simplifies the process of finding a solution of the governing stress-assisted diffusion equation.
Abstract: The presence of hydrogen in the lattice of high strength steels often embrittles the material making it more susceptible to crack growth. Hydrostatic stresses and stress gradients can significantly increase the local concentration of hydrogen around the defect thereby increasing the degradation process. Because linear elastic hydrostatic stresses are harmonic functions, a natural orthogonal coordinate system can developed using lines of constant hydrostatic stress together with those of its complex conjugate function for this class of stress fields for plane problems. Utilizing this system of natural coordinates often simplifies the process of finding a solution of the governing stress-assisted diffusion equation. Derive the natural orthogonal coordinate system for the linear elastic asymptotic solution of the Mode I fracture problem, and determine similar coordinates for the small scale yielding counterpart of the Barenenblatt-Dugdale strip model. Plot both orthogonal curvilinear coordinate systems, and represent the steady state stress-assisted diffusion equation derivable from Boltzman statistics in these coordinates. For the special case where solutions are independent of complex conjugate functions, obtain solutions of the diffusion equation by integration.
1 citations
TL;DR: In this paper, a Rice-Tracey model was used as the damage model with inclusion of the hydrostatic stress term to predict the deformation and fracture during tube expansion using the finite element (FE) method.
Abstract: To predict the deformation and fracture during tube expansion using the finite element (FE) method, a material model is considered that incorporates the damage evolution due to the deformation. In the current study, a Rice-Tracey model was used as the damage model with inclusion of the hydrostatic stress term. Since OFHC Cu is not significantly affected by strain rate, a Hollomon flow stress model was used. The material parameters in each model were obtained by using an optimization method. The objective function was defined as the difference between the experimental measurements and FE simulation results. The parameters were determined by minimizing the objective function. To verify the validity of the FE modeling, cross-verification was conducted through a tube expansion test. The simulation results show reasonable agreement with the experiments. The design for a minimum diameter of expansion tube using the FE modeling was verified by a simplified tube expansion test and simulation results.
1 citations
01 Jan 1973
TL;DR: In this article, the influence of a superimposed hydrostatic pressure on the critical surface expansion during a forging process was investigated, and it was shown that the surface expansion appears to decrease with increasing pressure.
Abstract: One of the most important process parameters in making compound products is the expansion of the bonding surface. Bonding is not obtained until a critical surface expansion, characteristic of the deformation process, is reached. This paper deals with an experimental investigation of the influence of a superimposed hydrostatic pressure on the critical surface expansion during a forging process. The critical surface expansion appears to decrease with increasing hydrostatic pressure. This may be due to the fact that the close contact between the materials necessary to obtain bonding is created by a micro-extrusion of the surfaces into each other. This may explain why the bond strength achieved by different processes, such as forging and extrusion, is quite different for the same value of the surface expansion.
1 citations