STUDY OF A NEW MODEL FOR PREDICTION OF CONTACT FATIGUE LIFE

This paper describes a new model for the prediction of contact fatigue life controlled by stresses. Mieses equivalent stress is chosed as a stress-related fatigue criterion. A non-zero contact fatigue limit is used. Depended on defect mechanics, relation between fatigue limit and material or inclusion is analysed. Two failure forms initiated in the subsurface or surface are considered, and prediction of contact fatigue life to the two failure forms is combined to a formula. A cofficient f(Λ) related to oil film cofficient Λ is used to express lubrication's influence upon contact fatigue life. The model is used to predict smme experimential contact fatigue lives. Predicted results fit experimental results well.