A continuum damage mechanics based approach to damage evolution of M50 bearing steel considering residual stress induced by shot peening

摘要

The damage evolution induced by three types of carbides in M50 bearing steel is studied in this paper. Stress distribution in the micro-domain is initially obtained to calculate the damage accumulation of the elements. Subsequently, the process of the butterfly generation is simulated. It can be seen that the butterfly wings are generated at the sites where maximum stress appears. The irregular shape carbide seems to be most harmful to the bearing material. Finally, the effect of residual stress on damage evolution induced by the carbides is investigated. The result shows that higher temperature, smaller balls and ion implantation are beneficial for the strengthening of residual stress and hence damage accumulation rate is reduced.