Fretting Fatigue Crack Initiation Behavior And Fatigue Life Prediction

Fretting fatigue is the principal reason for various failures of component, such as for airplane, watercraft, vehicle, nuclear energy, ocean engineering, and the aftereffects are all destructive.In this study, contact width and contact stress are calculated with the Hertz contact mechanics approach and the ANSYS finite element analysis approach, and then the results are compared with each other, based on the test model, ANSYS finite element mode is set up.The ANSYS finite element analysis is adopted to analyze fretting bridge on flat fretting model. The ANSYS fretting fatigue analyses are carried out for three different maximum axial loads and friction coefficients. From this analysis it gained the effect to fretting fatigue crack initiation on different axial loads and friction coefficients.Based on energy's conversion, a new SSI shear strain energy approach is brought up. With this approach it predict crack initiation location, crack initiation orientation of 45 steel in fretting bridge fretting model.In order to predict crack initiation location, crack initiation orientation and fretting fatigue life, the VB program based on SWT and SSI shear strain energy approach is developed, then 45 steel fretting fatigue life is predicted with SSI shear strain energy and SWT approach.The computation shows SSI shear strain energy approach is good for predicting fretting fatigue crack initiation location, crack initiation orientation and fretting fatigue life. Therefore, The SSI shear strain energy approach has important value in project.