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three-dimensional stress and stress Intensity for Tensioned Flat Plates with Edge Cracks

Tsinghua Science and Technology 2006年第1期11卷 131-136页

作者：王元清武延民石永久江见鲸 Department of Civil Engineering Tsinghua UniversityBeijing 100084 China Capital Engineering and Research Incorporation Limited Beijing 100053 China

The stress in the thickness direction is an important factor influencing the fracture behavior of structural members. A stress σy tensioned flat plate with edge cracks is widely used as an analysis model. The stresses σx and σy for the plate model can be acquired from Neuber＇s solution. However, the solution is applicable only for a perfect plane stress or plane strain state. As a consequence of the thickness of the plate a three-dimensional （3-D） stress state will arise near the crack tip, resulting in a variation of the distribution of σx and σy stresses. A full analysis for the 3-D stress fields for a tensioned flat plate with edge cracks has been therefore carried out. The results show that the 3-D stress field near the crack tip is mainly determined by two factors： the thickness of the plate and the curvature radius at the crack tip. A further analysis has been carried out for the stress intensity near the crack tip. In this paper we give some equations matching to the 3-D stress and stress intensity, which describe precisely the stress state near the crack tip, and which can be applied effectively in engineering analysis.

关键词： three-dimensional stress stress in the thickness direction stress intensity crack tip

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Modeling and behaviours of rockfill materials in three-dimensional stress space

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Science China(Technological Sciences) 2012年第10期55卷 2877-2892页

作者： XIAO Yang LIU HanLong ZHU JunGao SHI WeiCheng Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Geotechnical Research Institute Hohai UniversityNanjing 210098China School of Civil Engineering and Architecture Changzhou Institute of TechnologyChangzhou 213002China

A bounding surface model incorporating a unified nonlinear strength criterion is *** proposed bounding surface model contains 9 model parameters,which can be determined from the conventional triaxial *** bounding surface model can reproduce such behaviours as the strain hardening,the post-peak strain softening,and the volumetric strain contraction and *** on the comparisons between the predictions and the test results,the proposed strength criterion and model can well reproduce the experimental results of the strength and stress-strain behaviours of rockfill material in three-dimensional stress *** strength behaviour of rockfill material is summarized as:(a) the failure stress ratio decreases with the initial confining pressure on the meridian plane;(b) the failure deviatoric stress decreases with the Lode angle from 0o to 60o on the deviatoric *** stress ratio decreases with increasing one of such factors as the initial void ratio,the intermediate principal stress ratio and the minor principal stress at the same strain when the other factors are given.

关键词： bounding surface strength stress-strain three-dimensional stress constitutive model rockfill materials

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