航空学报 > 2014, Vol. 35 Issue (9): 2500-2505   doi: 10.7527/S1000-6893.2014.0099

平稳随机载荷历程下的疲劳裂纹扩展规律预测

白鑫, 谢里阳   

  1. 东北大学 机械工程与自动化学院 现代设计与分析研究所, 辽宁 沈阳 110819
  • 收稿日期:2013-11-08 修回日期:2014-05-09 出版日期:2014-09-25 发布日期:2014-06-06
  • 通讯作者: 谢里阳,Tel.:024-83673915 E-mail:lyxie@me.neu.edu.cn E-mail:lyxie@me.neu.edu.cn
  • 作者简介:白鑫 男,博士研究生。主要研究方向:机械装备疲劳强度与可靠性。Tel:024-83678622 E-mail:neu.baixin@gmail.com;谢里阳 男,博士,教授,博士生导师。主要研究方向:机械装备疲劳强度与可靠性。Tel:024-83673915 E-mail:lyxie@me.neu.edu.cn
  • 基金资助:

    国家自然科学基金(51335003,51175072)

Fatigue Crack Growth Law Prediction Based on Steady Random Load

BAI Xin, XIE Liyang   

  1. Institute of Modern Design and Analysis, College of Mechanical Engeering & Automation, Northeastern University, Shenyang 110819, China
  • Received:2013-11-08 Revised:2014-05-09 Online:2014-09-25 Published:2014-06-06
  • Supported by:

    National Natural Science Foundation of China (51335003, 51175072)

摘要:

工程中多数裂纹构件的受载是随机的,为了更合理、更准确地预测出服役裂纹构件的剩余寿命,针对裂纹构件承受平稳随机载荷且载荷历程的具体特征、载荷水平及载荷作用频度未知的情况,提出了一种预测疲劳裂纹扩展寿命的新方法。该方法根据一段时间对裂纹扩展情况的跟踪观测,推断裂纹扩展规律,实现疲劳裂纹扩展剩余寿命预测。根据应力大小与载荷作用频度是否均已知,将该方法分为两阶段观测法与单阶段观测法。结合一个具体的工程案例,详细阐述了该方法的应用,且验证了其可行性。所提出的方法应用方便、操作简单,可作为工程中预测疲劳裂纹剩余寿命的一种依据。

关键词: 疲劳, 裂纹扩展, 剩余寿命, 寿命预测, 平稳随机载荷

Abstract:

Most of the work load of crack components are random, in order to predict more reasonable and more accurate remaining life of crack components, a new method for predicting fatigue crack propagation life is proposed based on the situation that crack components are subjected to steady random load and without knowing the load history, the load level and the load frequency. This method can predict the crack growth law and evaluate the residual fatigue life of crack components by tracking and observing crack propagation. In addition, according to whether the load frequency or the load level is known, the method can be divided into two-stage observation method and one-stage observation method. Besides, this method is expressed and verified in details by a illustrative project example. And this method is proved to be much more convenient and easy to predict the remaining useful life of a crack component in engineering.

Key words: fatigue, crack propagation, residual life, life prediction, steady random load

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