Prediction of Fretting Fatigue Life Based on Energy Density Method

Abstract

Abstract:

Strain energy based damage parameters were calculated from the stress and strain fields on contact interface. Material parameters in the damage parameter-life curve were obtained from fretting fatigue experiments. Finally, the fretting fatigue life prediction model of LZ50 steel was established. Compared with the surface wave transmission(SWT) model, it is found that the Chen damage parameter is selected as fatigue life predication. The influences of friction coefficient, rounded corner, pressure and cyclic tension loads on Chen damage parameters of LZ50 axle steel were studied, and the crack initiation position and fretting fatigue life of a CRH2 type hollow axle was also investigated.

Key words: fretting fatigue, crack initiation, energy density method;fatigue life

摘要：

通过接触界面的应力应变场和临界平面法计算了能量密度损伤参数，结合疲劳试验得到了能量密度损伤参数-寿命关系曲线中的材料常数，建立了LZ50钢微动疲劳寿命的预测公式。根据裂纹萌生寿命预测效果，将Chen损伤值作为裂纹萌生控制参数。分析了摩擦因数、微动桥半径、循环载荷和微动桥压力对LZ50车轴钢的Chen损伤值的影响，以及CRH2型动车组空心车轴裂纹萌生的位置及寿命。

关键词: 微动疲劳, 裂纹萌生, 能量密度法, 疲劳寿命

CLC Number:

TH114

Ping Xuecheng, Zhao Liaoxiang, Wu Weixing. Prediction of Fretting Fatigue Life Based on Energy Density Method[J]. China Mechanical Engineering, 2016, 27(01): 84-90.

平学成, 赵辽翔, 吴卫星. 基于能量密度法预测微动疲劳寿命[J]. 中国机械工程, 2016, 27(01): 84-90.

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