对接焊缝残余应力对疲劳裂纹扩展的影响  

Influences of Welding Residual Stresses on Fatigue Crack Growth of Butt Weld Plate

作　　者：瞿伟廉[1] 何杰[1] 陈波[1] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070

出　　处：《武汉理工大学学报》2009年第2期116-119,共4页Journal of Wuhan University of Technology

基　　金：国家高技术"863"计划项目(2007AA11Z119);国家自然科学基金(50678142)

摘　　要：研究了平板对接焊缝的疲劳裂纹扩展问题,提出了一种考虑残余应力场重分布的裂纹扩展寿命计算方法。基于Terada提出的焊接残余应力场随裂纹扩展重分布的模型,在裂纹扩展过程中不断更新残余应力引起的应力强度因子和应力比并在此基础上计算构件裂纹扩展寿命。采用该方法分析了某焊接钢板的裂纹扩展寿命,并和不考虑残余应力场重分布的叠加法进行了对比。研究表明,提出的基于焊接残余应力场的疲劳裂纹扩展分析方法更加符合实际情况,可以预测出相对准确的裂纹扩展寿命。The fatigue crack growth of butt weld plate is actively investigated in this research.A new approach for predicting growth life of fatigue crack prediction with the influence of the redistribution of welded residual stress is proposed.Based on analytical model of residual stress redistribution proposed by Terada,the SIF(stress intensity factor) associated with residual stress field is instantaneously updated during the process of fatigue crack growth for computing the stress ratio and thereby predicting cra...

关 键 词：焊接残余应力 疲劳 裂纹扩展 应力强度因子 

分 类 号：O346.1[理学—固体力学]