• CN:11-2187/TH
  • ISSN:0577-6686

›› 2005, Vol. 41 ›› Issue (3): 193-200.

• 论文 • 上一篇    下一篇

小孔法测量残余应力时孔边塑性应变的有限元分析及修正

张晓宏;赵海燕;蔡志鹏;吴甦   

  1. 清华大学机械工程系
  • 发布日期:2005-03-15

FEM ANALYSIS AND A CORRECTION ON PLASTICITY EFFECT AT THE HOLE EDGE WHEN USING THE CENTRE HOLE METHOD FOR MEASURING RESIDUAL STRESS

Zhang Xiaohong;Zhao Haiyan;Cai Zhipeng;Wu Su   

  1. Department of Mechanical Engineering, Tsinghua University
  • Published:2005-03-15

摘要: 小孔法测量高残余应力时,小孔周围材料接近于屈服状态,由于产生塑性变形而引入塑性附加应变,使得测量结果产生很大的误差。研究了应变释放系数与主应力之间的双轴比、主应力方向与应变花方向夹角以及应力水平之间的关系,通过有限元数值试验的方法对应变释放系数进行标定,使其包含有塑性附加应变的影响,并利用标定后的应变释放系数对焊接残余应力测量结果进行了修正,得到了较好的结果。

关键词: 残余应力, 焊接, 小孔法, 有限元

Abstract: Significant error of the measuring result may arise when measuring high residual stress by means of the centre hole method. And because the material around the hole is close to the yield limit, plastic deformation induced plastic strain. The strain release coefficients related with the angle between the principal direction of stress and the direction of the strain gauge, the biaxiality ratio, and the equivalent stress are studied . Then by FEM (Finite elcment method) the strain release coeffi-cients including plasticity effects are recalculated, which we used to measure and calculate the residual stresses induced by welding in welded Aluminum plate.

Key words: Centre hole method, FEM (Finite element method), Residual stress, Welding

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