Ⅰ型试件裂端三维应力结构分析之二——应力结构分析

岳珠峰; 郑长卿

Ⅰ型试件裂端三维应力结构分析之二——应力结构分析

西北工业大学工程力学系

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出版历程
- 收稿日期: 1991-06-25
- 刊出日期: 1993-09-15

The Analyses of the Three-Dimensional Stress Structurenear the Crack Tip of Mode I CT Specimens in Elastic-Plastic State Part 2:The Analyses of the Stress Structure

Department of Engineering Mechanics, Northwestern Polyiechnical University, Xi'an

摘要

摘要: 在文献[1]的基础上,本文分别对试件纤维区和剪切唇的应力结构进行考察.纤维区的应力结构特点为:可以进行变量z分离;对称面上的应力结构可由平面应变FEM解或HRR场解经应力三维度修正获得;载荷水平及试样厚度对应力结构的影响,可由厚度方向的CTOD得到反映,所得到应力表达式大为简便与直观.对剪切唇的应力结构进行考察,发现满足一定的精度可由插值法近似获得.本文提出了一种平面应变近似程度系数,并对此进行分析,该系数可较好地反映试样厚度、型式及载荷水平.本文也对断裂参量进行了分析,指出可对CTOD进行应力三维度修正获得.
- 应力结构 /
- 奇异性 /
- Z1区域 /
- 应力三维度Rσ /
- CTOD /
- 剪切唇 /
- 插值法 /
- 平面应变程度近似系数
Abstract: Based on [1], the stress structures of the smooth region and shear lip of the specimens have been investigated in the paper.The characteristics of the stress structure in the smooth region have been found that the variable z can be separated out;the stresses in the midsection can be obtained by the plane strain FEM results or HRR structure modified by the stress triaxiality. The effects of load level and thickness on the stress structure can be reflected by the distribution of CTOD along the thickness direction. The obtained expressions of the stresses are very simple and visualized. The analyses of the stress structure in the shear lip show that the stresses can be obtained by different methods of interpolation to a certain precise degree.A new degree parameter of the plane strain state has been put forward and studied. The parameter can reflect relatively well the variation of the kind and thickness of the specimen as well as the load level. The fracture parameter has also been investigated to be sure that it can be obtained by modified CTOD with the stress triaxiality.
- stress structure /
- singularity /
- Z₁ region /
- stress triaxiality Rσ /
- CTOD /
- shear lip /
- interpolative method /
- degree parameter of the plane strain state

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参考文献(19)

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