Cause Analysis on Failure of a High-Temperature and Heavy-Load Self-Lubricating Joint Bearing after Overloading Test

After bench overloading test of a high-temperature and heavy-load self-lubricating joint bearing, local cracking and fracture failure occurred at the bearing inner ring. The causes of the cracks and fractures at the bearing inner ring were analyzed by means of macro analysis and micro analysis, and were examined and verified by ANSYS finite element analysis technology. The results show that the cracks and fractures of the joint bearing were due to the fact that the edges of the inner and outer rings and the pin grooves were not chamfered, which resulted in a large stress concentration. Then the joint bearing was optimized based on the causes of cracks and fractures and the results of ANSYS finite element analysis to reduce the local stress concentration, which was conducive to the normal operation of the joint bearing bench test and the improvement of the bearing fatigue life.