Ⅰ型裂纹试件裂端三维应力结构分析之一——裂端约束参数与断裂参数分析

岳珠峰; 郑长卿

Ⅰ型裂纹试件裂端三维应力结构分析之一——裂端约束参数与断裂参数分析

西北工业大学工程力学系

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出版历程
- 收稿日期: 1992-06-25
- 刊出日期: 1993-07-15

The Analysis of the Three-Dimensional Stress Structure Near the Crack Tip of Mode Ⅰ CT Specimens in Elastic-Plastic State(Ⅰ)——The Analysis of Constraint Parameters and Fracture Parameters

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

摘要

摘要: 本文利用大型通用结构有限元分析程序ADINA对16Mn材料制的两种不同厚度的Ⅰ型CT试样进行了计算与分析,结果表明,厚度方向的约束状态将试样分成两部分:具有相同约束状态的心部高约束区(Z₁)和约束显著变化的外边缘区(Z₂);有限元计算和实验测定结果证实了这两部分分别与试样断口上的纤维区及剪切唇相对应.所以,Ⅰ型裂纹试件裂端应力、应变场可分别通过这两个区域加以分析获得.本文对一些断裂参数如裂纹尖端张开位移(CTOD)和空穴扩张比(V_g)参数也进行了考察,结果表明这两个参数在厚度方向有相类似的变化规律,在一定程度上都可反映试样的厚度效应及外载荷水平效应.
- Ⅰ型裂纹试件(CT试样) /
- 平面应变约束系数(γ) /
- 应力三维度(R_σ) /
- 裂纹尖端张开 /
- 位移(CTOD) /
- 空穴扩张比(V_g)
Abstract: In the present paper,three dimensional analyses of some general constraint parameters and fracture parameters near the crack tip of Mode I CT specimens in two different thicknesses are carried out by employing ADINA program.The results reveal that the constraints along the thickness direction are obviously separated into two parts:the keeping similar high constraint field(Z₂) and rapid reducing constraints one(Z₂).The two fields are experimentally confiremed to correspond to the smooth region and the shear lip on the fracture face respectively.So the three dimensional stress structure of Mode Ⅰ specimens can be derived through discussing the two fields respectively.The distribution of the Crack Tip Opening Displacement(CTOD) along the thickness direction and the three dimensional distribution of the void growth ratio(V_g) near the crack tip are also obtained.The two fracture parameters are in similar trends along the thickness direction,and both of them can reflect the effect of thickness and that of the loading level to a certain degree.
- mode I cracked specimen(CT specimens) /
- plane strain constraint(γ) /
- stress triaxiality(R_σ) /
- crack tip opening displacement(CTOD) /
- void growth ratio(V_g) /

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参考文献(20)

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