Gang Jie

Research on Fatigue Life of the Automobile Differential Case

Basing on the fatigue breaking of the differential case of the drive axle with the material of nodular graphite cast iron, the fatigue analysis is made. According to the criterion of ‘Q/T 543-1999 Drive Axle Bench Test Standard’, with the fatigue software FEMFAT 4.7D, the research on the cumulative damage and endurance limit safety factors in differential case is studied in terms of the Miner modified fatigue theory. The reason of the failure of the differential case can be sure that the stress concentration is at the region of the differential shaft hole in the differential case, and the safety factors are beyond the safe yield limit of the material QT450-10. Same is the comparison of the experimental results to simulation results on the failure sample, which is sure that the fatigue analysis method is reasonable and effective. It is helpful to optimize the structure parameter in the differential case design through the optimization algorithm for the drive axle in the automobile.

Fatigue Life Prediction of Driving Axle Housing Assemble Based on FEA

Based on the uncertain problem during the design of the fatigue life of drive axle housing assemble, entity model of drive axle housing assemble of some commercial vehicle is built by UG. According to national standard of the Bench Test, with finite element method, the finite element model is built and the static strength analysis is made by the FEM-software ABAQUS 6.8. On the base of the result of stress-strain analysis and the model validation, with the fatigue software FEMFAT 4.7D, the research on the cumulative damage and endurance limit safety factors is studied in terms of the Miner modified fatigue theory in the drive axle housing assemble. The results show that the model and method is reasonable and effective. It is helpful to optimize the structure parameter in the drive axle design through the optimization algorithm in the automobile.