考虑缺口效应的多轴疲劳寿命预估模型

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (6): 56-60.

考虑缺口效应的多轴疲劳寿命预估模型

刘俭辉^*¹,潘雪梅¹,吕鑫¹,资绒¹,陈晓闯²

1.兰州理工大学机电工程学院, 甘肃兰州 730050;
2.兰州金川新材料科技股份有限公司, 甘肃兰州 730101

收稿日期:2020-12-04 出版日期:2021-12-28 发布日期:2021-12-28
通讯作者: 刘俭辉(1985-),男,河南睢县人,博士,副教授.Email:liujh@lut.edu.cn
基金资助:
国家自然科学基金青年基金(51605212),甘肃省自然科学基金(20JR10RA161)

A fatigue life prediction model of multi-axial notched specimens with notch effect

LIU Jian-hui¹, PAN Xue-mei¹, LU Xin¹, ZI Rong¹, CHEN Xiao-chuang²

1. School of Mechanical and Electrical Engineering,Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Lanzhou Jinchuan Advanced Materials Technology Co. Ltd., Lanzhou 730101, China

Received:2020-12-04 Online:2021-12-28 Published:2021-12-28

摘要/Abstract

摘要： 为研究缺口构件的多轴疲劳问题,基于损伤力学理论,结合von Mises等效准则的思想,建立一个考虑缺口效应的多轴损伤本构方程,综合考虑正应力和切应力在多轴损伤过程中所起的作用,提出一种适用于缺口件的多轴疲劳寿命预估模型.采用GH4169镍基高温合金、SAE1045钢和LY12CZ铝合金3种材料的缺口件多轴疲劳实验数据对所提出的模型进行评估和验证.结果表明:新模型的精度要高于传统的局部应力应变法,且与实验结果相吻合;同时新模型计算方便,便于工程应用.

关键词: 损伤力学, 缺口效应, 多轴疲劳, 寿命预估, von Mises等效准则

Abstract: In order to study the multi-axial fatigue of notched specimens, based on the theory of damage mechanics and the idea of von Mises equivalent rule, a multi-axial damage constitutive equation considering notch effect was established, which comprehensively considers the effect of normal stress and shear stress in the multi-axial damage process; and further, a multi-axial fatigue life prediction model that can be applied to metal notched parts was proposed in this paper. The model was evaluated by the multi-axial notched fatigue test data of GH4169 nickel-based superalloy, SAE1045 steel and LY12CZ aluminium alloy. The results show that the multi-axial fatigue life predicted by the proposed model was in good agreement with the test results, and the prediction accuracy was significantly improved compared with the traditional local stress strain approach. At the same time, the model is easy to calculate and is convenient for engineering application.

Key words: damage mechanics, notch effect, multi-axial fatigue, life prediction, von Mises equivalent rule

中图分类号:

TH114

刘俭辉,潘雪梅,吕鑫,资绒,陈晓闯. 考虑缺口效应的多轴疲劳寿命预估模型[J]. 兰州理工大学学报, 2021, 47(6): 56-60.

LIU Jian-hui, PAN Xue-mei, LU Xin, ZI Rong, CHEN Xiao-chuang. A fatigue life prediction model of multi-axial notched specimens with notch effect[J]. Journal of Lanzhou University of Technology, 2021, 47(6): 56-60.

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