Failure Analysis of Rolling Bearings Based on Explicit Dynamic Method and Theories of Hertzian Contact.

Bearing failure is one of the most important factors influencing performance, accuracy and reliability of rotating machineries. Bearing faults are commonly shown as the defects such as rolling body fracture, rolling body, and surface pitting, etc. Dynamic model of 6206 deep groove ball bearing with the above-mentioned bearing faults has been established by finite element method. Exponent Hardening Plasticity Cowper Symonds model related to strength and hardening coefficients is adopted for describing elastoplastic material model of rolling body. The smaller difference between simulated results obtained by EDM and theoretical results calculated by Hertzian point contact theory validates the reliability of explicit dynamic model established in this paper. Dynamic contact characteristics of rolling bearing with different faults such as rolling body fracture, rolling body peeling, and bearing pitting are investigated using explicit dynamic model above. By comparing contact characteristics of fault bearing with those of fault-free bearing, it provides a reference for fault diagnosis and failure prevention of rolling bearing. [ABSTRACT FROM AUTHOR]