基于临界面理论的多轴等效应变疲劳寿命预估模型

doi:10.3969/j.issn.1004-132X.2022.15.008

摘要/Abstract

摘要： 针对等效应变模型未考虑非比例附加强化影响这一不足，将最大剪切应变幅所在平面定义为临界面，引入剪切平面上的最大正应力、正应变变程以及相位差作为损伤参量来反映非比例加载条件下的附加强化效应，该损伤参量还考虑了临界面上的最大正应力和正应变变程对材料裂纹萌生和扩展的影响。采用16MnR、GH4169、S460N、45钢和Pure Ti五种薄壁圆管试件来验证模型的正确性和有效性，并与三种经典模型进行对比分析，结果表明，新模型的预估能力要优于其他三种模型，且寿命预测结果较为精确。

关键词: 多轴疲劳, 等效应变, 临界面法, 相位差, 非比例附加强化

Abstract: In view of the defects that the effects of non proportional additional strengthening were not considered in the equivalent strain model, the plane where the maximum shear strain was located was defined as the critical plane and introduced the maximum normal stress, normal strain range and phase difference in the shear plane as damage parameters to reflect the additional strengthening effects under non proportional loading. The influences of the maximum normal stress and normal strain range of the critical plane on the crack initiation and propagation were also considered. Thin-walled tube specimens made of five kinds of materials, 16MnR, GH4169, S460N, 45 steel and pure Ti, were used to verify the correctness and effectiveness of the proposed model. Meanwhile, compared with three classical models, the results show that the prediction ability of the proposed model is better than that of the other three models and the life prediction results are more accurate.

Key words: multiaxial fatigue, equivalent strain, critical plane method, phase difference, non-proportional additional hardening

中图分类号:

TH114
O346.2

刘俭辉, 赵贺, 冉勇, 李斌. 基于临界面理论的多轴等效应变疲劳寿命预估模型[J]. 中国机械工程, 2022, 33(15): 1821-1827.

LIU Jianhui, ZHAO He, RAN Yong, LI Bin. Multiaxial Equivalent Strain Fatigue Life Prediction Model Based on Critical Plane Theory[J]. China Mechanical Engineering, 2022, 33(15): 1821-1827.

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