THE THREE DIMENSIONAL CURVED ELASTICITY-PLASTICITY CRACK TIP OPENING DISPLACEMENT UNDER QUASI-STATIC LOAD

YANG DaPeng; WANG ShuQin; ZHOU Chao; JIN YuXia; YANG XinHua

doi:10.16579/j.issn.1001.9669.2019.02.030

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THE THREE DIMENSIONAL CURVED ELASTICITY-PLASTICITY CRACK TIP OPENING DISPLACEMENT UNDER QUASI-STATIC LOAD

更新时间：2022-09-22

- THE THREE DIMENSIONAL CURVED ELASTICITY-PLASTICITY CRACK TIP OPENING DISPLACEMENT UNDER QUASI-STATIC LOAD
- Journal of Mechanical Strength Vol. 41, Issue 2, Pages: 442-446(2019)
- 作者机构：
  
  1. 华中科技大学土木工程与力学学院力学系博士后流动站
  2. 郑州职业技术学院材料工程系
  3. 华中科技大学船舶与海洋工程学院
  4. 河南省交通高级技工学校汽车工程系
  5. 郑州市国防科技学校教学部
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2019.02.030
  CLC：
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YANG DaPeng, WANG ShuQin, ZHOU Chao, et al. THE THREE DIMENSIONAL CURVED ELASTICITY-PLASTICITY CRACK TIP OPENING DISPLACEMENT UNDER QUASI-STATIC LOAD. [J]. 41(2):442-446(2019)
DOI：

YANG DaPeng, WANG ShuQin, ZHOU Chao, et al. THE THREE DIMENSIONAL CURVED ELASTICITY-PLASTICITY CRACK TIP OPENING DISPLACEMENT UNDER QUASI-STATIC LOAD. [J]. 41(2):442-446(2019) DOI： 10.16579/j.issn.1001.9669.2019.02.030.

摘要

主要研究准静载荷作用下的三维弹塑性弯曲裂纹尖端的张开位移问题。综合考虑了准静作用应力,三维塑性区域边界上正应力与剪应力,利用二阶摄动方法计算了三维弹塑性弯曲裂纹尖端的张开位移。用数值解法计算出三维弹塑性弯曲裂纹尖端张开位移,作图分析了三维弹塑性弯曲裂纹尖端张开位移与三维裂纹体几何尺寸之间的变化关系。三维弹塑性弯曲裂纹尖端张开位移随着三维裂纹体厚度的增大而减小,随着三维裂纹体厚度的均匀增大,三维弹塑性弯曲裂纹尖端张开位移尺寸不断减小,减小的幅度越来越小,最终趋于平面应变状态下的弹塑性弯曲裂纹尖端张开位移尺寸。当三维裂纹体几何尺寸相同时,三维弯曲裂纹尖端张开位移尺寸随外载荷的不断增大而逐渐增大。建立了一个计算三维弹塑性弯曲裂纹尖端张开位移尺寸的崭新理论模型。

Abstract

In this article, three dimensional elastic-plastic curved crack tip opening displacement under quasi-static loads has been mainly studied, and three dimensional curved crack tip opening displacement has been calculated as a practical application of a second order perturbation method, where the effects of quasi-static applied stresses and quasi-static normal and shear stresses on the boundaries of plasticity area are synthetically taken into considerations. Three dimensional curved elastic-plastic crack tip opening displacement has been calculated by numerical solutions, diagrams have been constructed to analyse the transformation relationships between curved crack tip opening displacement and three dimensional crack body geometrical measurement. Curved crack tip opening displacement will decrease when three dimensional crack body thickness increases. When crack body thickness increases evenly, three dimensional curved crack tip opening displacement will continuously decrease, furthermore, the decrease extent will be more and more slightly, and tend to plane strain state ultimately. Curved crack tip opening displacement will increase when external loads increase with the same crack body thickness. A new theoretical model where curved crack tip opening displacement was calculated has been established in three dimensional crack body.

关键词

三维裂纹体弯曲裂纹张开位移准静作用应力二阶摄动方法

Keywords

Three dimensional crack bodyCurved crackOpening displacementQuasi-static applied stressesA second order perturbation solution

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