• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (8): 43-49.doi: 10.3901/JME.2017.08.043

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考虑残余应力重分布情况下的裂纹扩展预测研究

朱林1, 贾民平1, 冯月贵2, 王会方2, 胡静波2   

  1. 1. 东南大学机械工程学院 南京 211189;
    2. 南京市特种设备安全监督检验研究院 南京 210002
  • 出版日期:2017-04-15 发布日期:2017-04-15
  • 作者简介:

    朱林,男,1989年出生,博士研究生。主要研究方向为机械系统可靠性与寿命预测。

    E-mail:zhulin157@163.com

    贾民平(通信作者),男,1960年出生,博士,教授,博士研究生导师。主要研究方向为故障诊断及质量监控。

    E-mail:mpjia@seu.edu.cn

  • 基金资助:
    * 国家自然科学基金(51675098)、高等学校博士学科点专项科研基金(20130092110003)和江苏省普通高校研究生科研创新计划(KYLX15_0059)资助项目; 20160712收到初稿,20161130收到修改稿;

Prediction Study of the Crack Propagation with Consideration of the Residual Stress Redistribution

ZHU Lin1, JIA Minping1, FENG Yuegui2, WANG Huifang2, HU Jingbo2   

  1. 1. School of Mechanical Engineering, Southeast University, Nanjing 211189;
    2. Nanjing Special Equipment Inspection Institute, Nanjing 210002
  • Online:2017-04-15 Published:2017-04-15

摘要:

针对裂纹扩展引起残余应力重分布现象,基于Hull-Rimmer理论建立伴随损伤扩展的残余应力重分布预测模型,并通过组合应力强度因子及相应判据将其与裂纹扩展预测模型相结合,以充分模拟残余应力对裂纹扩展过程的影响规律。运用建立后的残余应力重分布预测模型对两种垂直于焊缝方向的裂纹扩展实例及一种沿焊缝方向的裂纹扩展实例的残余应力重分布情况进行预测研究,并将预测结果与裂纹扩展预测模型相结合来对考虑残余应力重分布情况下的裂纹扩展速率进行预测。结果发现基于Hull-Rimmer理论的残余应力重分布预测模型所预测出的结果与试验结果的平均相对误差仅为4.86%,对于残余应力重分布现象及后续裂纹扩展的预测研究具有重要意义。

关键词: 残余应力, 裂纹扩展, 重分布, Hull-Rimmer理论

Abstract:

In view of the residual stress redistribution induced by the crack propagation process, the prediction model of residual stress redistribution along with the crack propagation is established based on the Hull-Rimmer theory. And the influence law of the residual stress redistribution on the damage process is achieved by using the total stress intensity factor and the corresponding criterion. Also the established prediction model of residual stress redistribution is used to analysis the two cases propagate perpendicular to the weld and a case propagate along the weld direction, and based on which the propagation velocity of crack is predicated by considering the redistribution of residual stress. It can be found from the results that the average error between results of prediction model based on the Hull-Rimmer theory and experimental results is 4.86%, which is of great significance for the prediction study of residual stress redistribution phenomena and subsequent crack propagation.

Key words: crack propagation, redistribution, residual stress, Hull-Rimmer theory