平稳随机载荷历程下的疲劳裂纹扩展规律预测
收稿日期: 2013-11-08
修回日期: 2014-05-09
网络出版日期: 2014-06-06
基金资助
国家自然科学基金（51335003，51175072）
Fatigue Crack Growth Law Prediction Based on Steady Random Load
Received date: 2013-11-08
Revised date: 2014-05-09
Online published: 2014-06-06
Supported by
National Natural Science Foundation of China (51335003, 51175072)
白鑫 , 谢里阳 . 平稳随机载荷历程下的疲劳裂纹扩展规律预测[J]. 航空学报, 2014 , 35(9) : 2500 -2505 . DOI: 10.7527/S1000-6893.2014.0099
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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