Assessment of fatigue life of remanufactured impeller based on FEA
1. The State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China.
2. National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, ChinaAccepted： 2016-07-26 Available online：2016-08-31
Predicting the fatigue life of remanufactured centrifugal compressor impellers is a critical problem. In this paper, the S-N curve data were obtained by combining experimentation and theory deduction. The load spectrum was compiled by the rain-flow counting method based on the comprehensive consideration of the centrifugal force, residual stress, and aerodynamic loads in the repair region. A fatigue life simulation model was built, and fatigue life was analyzed based on the fatigue cumulative damage rule. Although incapable of providing a high-precision prediction, the simulation results were useful for the analysis of fatigue life impact factors and fatigue fracture areas. Results showed that the load amplitude greatly affected fatigue life, the impeller was protected from running at over-speed, and the predicted fatigue life was satisfied within the next service cycle safely at the rated speed.