Fatigue failure analysis and finite element assessment of the twins torsion spring

摘要

To meet the vibration isolation requirements, the twins torsion spring is placed between the pivot and the clutch, which can make the generator and front gear train run more stably, and improve the durability of the system. In this study, the twins torsion spring was winded by SUS 631 stainless steel, and was treated by medium-temperature tempering. The fatigue life of the twins torsion spring was investigated. The morphology of fatigue fracture of the twins torsion spring was examined by scanning electron microscopy (SEM). And the vickers micro-hardness of the spring was tested by micro-hardness tester. Large amount of shrinkage porosity can be found in the fatigue extension area and instantaneous fault zone. And the average micro-hardness was about 565.5 HV on the area near the fracture. In order to analyze the causes of the fracture, the fatigue life was simulated by finite element (FE) numerical analysis. The simulation results are consistent with the experimental test of fatigue.