基于损伤力学的轴承钢旋弯疲劳寿命预测

Rotating bending fatigue life prediction of bearing steel based on damage mechanics

基于连续损伤力学理论,提出了考虑真空化学热处理工艺影响的疲劳损伤模型及数值计算方法,研究了M50NiL轴承钢的旋弯疲劳损伤分析及寿命预测方法。给出了本构模型、疲劳损伤演化方程和理论模型中的材料参数标定方法,基于ABAQUS平台,通过编写UMAT子程序,实现了基于硬化层影响的疲劳损伤分析的损伤力学-有限元数值计算方法;对淬火回火、渗碳及碳氮复渗2种真空化学热处理的M50NiL轴承钢,开展了旋弯疲劳试验,分析了热处理工艺对疲劳性能的影响;基于提出的疲劳损伤模型及数值计算方法,预测了M50NiL轴承钢的旋弯疲劳寿命,并与试验结果进行对比,验证了所提方法的适用性。

This paper proposes a fatigue damage evolution model and numerical calculation method based on the theory of continuum damage mechanics,taking into account the effects of vacuum chemical heat treatment.Rotating bending fatigue damage analysis and life prediction are performed for M50NiL bearing steel.First,the constitutive model,the fatigue damage evolution equation and the material parameter calibration method in the theoretical model are presented.Second,based on the ABAQUS platform,the damage mechanics finite element numerical method for fatigue damage analysis considering the influence of the hardened layer is implemented by the UMAT subroutine.After that,the rotating bending fatigue experiments are conducted for the untreated,carburized,and carbonitrided M50NiL bearing steel,and the effect of the heat treatment process on fatigue properties is analyzed.Finally,the rotational bending fatigue life of M50NiL bearing steel is predicted using the suggested fatigue damage model and numerical approach,and the experimental findings validate the applicability of the proposed method.