IMPACT OF HARDENING ON SLIGHTLY CURVED ELASTICITY-PLASTICITY CRACK TIP DISPLACEMENT UNDER QUASI-STATIC LOADS

YANG DaPeng; WANG JunJie; ZHAO Yao; LI TianYun; CHEN JianQiao

doi:10.16579/j.issn.1001.9669.2015.04.006

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IMPACT OF HARDENING ON SLIGHTLY CURVED ELASTICITY-PLASTICITY CRACK TIP DISPLACEMENT UNDER QUASI-STATIC LOADS

更新时间：2022-09-22

- IMPACT OF HARDENING ON SLIGHTLY CURVED ELASTICITY-PLASTICITY CRACK TIP DISPLACEMENT UNDER QUASI-STATIC LOADS
- Journal of Mechanical Strength Vol. 37, Issue 4, Pages: 776-780(2015)
- 作者机构：
  
  1. 郑州职业技术学院机械工程系
  2. 华中科技大学船舶与海洋工程学院
  3. 华中科技大学土木工程与力学学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2015.04.006
  CLC：
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YANG DaPeng, WANG JunJie, ZHAO Yao, et al. IMPACT OF HARDENING ON SLIGHTLY CURVED ELASTICITY-PLASTICITY CRACK TIP DISPLACEMENT UNDER QUASI-STATIC LOADS. [J]. 37(4):776-780(2015)
DOI：

YANG DaPeng, WANG JunJie, ZHAO Yao, et al. IMPACT OF HARDENING ON SLIGHTLY CURVED ELASTICITY-PLASTICITY CRACK TIP DISPLACEMENT UNDER QUASI-STATIC LOADS. [J]. 37(4):776-780(2015) DOI： 10.16579/j.issn.1001.9669.2015.04.006.

摘要

研究准静载荷作用下的硬化材料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,塑性区域边界上正应力与剪应力,利用二阶摄动方法与卡氏定理计算了硬化材料弹塑性弯曲裂纹尖端的张开位移。作图分析了弹塑性弯曲裂纹尖端张开位移尺寸与材料硬化指数之间的变化关系。在幂硬化材料中,弹塑性弯曲裂纹尖端张开位移随着材料硬化指数n的增大而减少,当n等速均匀增加时,弹塑性弯曲裂纹尖端张开位移加速减少,减少的幅度越来越大。当材料的硬化指数相同时,弯曲裂纹尖端张开位移随外载荷的不断减小而逐渐减小。开拓了一个计算硬化材料弹塑性弯曲裂纹张开位移的理论模型的崭新领域。

Abstract

In this article,elastic-plastic curved crack tip opening displacement in hardened material under quasi-static loads has been mainly studied,and curved crack tip opening displacement has been calculated as a practical application of a second order perturbation method and theorem of surname KA,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. Diagrams have been constructed to analyse the transformation relationships between curved crack tip opening displacement size and hardening exponents. Curved crack tip opening displacement will decrease when hardening exponents increase in hardened material. The decrease extent of curved crack tip opening displacement will be more and more severe when hardening exponents increase evenly. Curved crack tip opening displacement will decrease when external loads decrease with the same hardening exponents. A brand new domain of theoretical model where CTOD was calculated has been reclaimed in hardened material.

关键词

准静载荷硬化材料弯曲裂纹二阶摄动方法张开位移

Keywords

Quasi-static loadsHardened materialCurved crackA second order perturbation solutionCTOD

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