考虑材料动态记忆特性的疲劳累积损伤模型

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关键词：材料记忆性能;疲劳寿命预测；疲劳累积损伤；应力-寿命曲线中图分类号：TH114DOI：10.3969/j.issn.1004-132X.2025.08.009 开放科学（资源服务）标识码（OSID）：

Abstract：In order to evaluate the fatigue lifeof engineering components under variable amplitude loads and improve the prediction accuracy of fatigue life，based on the S-N curve，a new form of material memory performance function was introduced and a new fatigue cumulative damage model was established considering the damages and irreversible degradation caused by grain boundary cracking，slip extrusion and extrusion in the materials caused by cyclic loads. A two-stage loading tests were carried out on the pump head bodies of 3ONiCrMoV12 and 30CrMnSiA to verify the accuracy of the model proposed herein for fatigue life prediction.The results show that the fatigue cumulative damage model considering the dynamic memory characteristics of the materials is compared with other models.The fatigue life prediction results under high-low two-stage loading conditions are within the error band of 1.5 times，and the mean prediction error is less than O.1，which has higher prediction accuracy.

Key words： material memory property;fatigue life prediction; fatigue cumulative damage ; S -N curve

0 引言

工程结构中，涡轮叶片、泵头体等部件承受着不同形式的变幅循环载荷，随着循环次数的增加最后直至断裂失效。（剩余14111字）