Nantong Taisheng Blue Island Offshore Co.,Ltd.;School of Aerospace Engineering and Applied Mechanics,Tongji University;
[Purpose] To quantify the abnormal propagation behavior of small cracks and predict the initiation life of fatigue cracks, [Method] the interaction between different mechanical parameters such as stress gradient and stress intensity factor range during the process of small crack propagation is analyzed in depth, and a new mechanism for small crack propagation is proposed based on this. [Result] The results indicate that the stress gradient generated by small crack propagation can explain the difference between the sharp notch fatigue stress concentration factor Kf and the static stress concentration factor Kt. The predicted fatigue crack initiation life of the model is in good agreement with the experimental data. The new mechanism can not only effectively quantify the abnormal propagation behavior of small cracks, but also accurately predict the initiation life of fatigue cracks. [Conclusion] The research results can provide some references for predicting the fatigue life of small cracks at the root of narrow gap structures.
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Basic Information:
DOI：10.13788/j.cnki.cbgc.2025.04.16
China Classification Code:P75
Citation Information:
[1]朱军,吴帅宇,王琛等.狭长缺口结构根部疲劳小裂纹寿命预测方法[J].船舶工程,2025,47(04):125-132.DOI:10.13788/j.cnki.cbgc.2025.04.16.
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国家自然科学基金（12372081,11972255）