Effect of initial crack inclination angle on subsurface crack propagation of cylindrical roller bearing
In order to explore the influence of the inclination angle of the subsurface crack on the stress distribution and crack propagation of the cylindrical roller bearing,based on the theories of fracture mechanics and damage mechanics,the finite element model of the cylindrical roller bearing was estab-lished by using the extended finite element method(XFEM),and the dynamic propagation process of the initial crack with different inclination angles on the subsurface of the raceway under external load was simulated.The change of stress at the tip of the subsurface crack with crack inclination angles and the influence of stress at the tip of the crack on crack propagation were analyzed.The simulation results show that the propagation of subsurface cracks with an initial inclination angle of 0°-30.0° is mainly affected by the horizontal stress(S11)under the pressure load of a cylindrical roller.The prop-agation of subsurface horizontal cracks at both tips is synchronous and symmetrical.However,with the increase of the inclination angle of the counterclockwise rotation of the initial subsurface crack,the crack propagation rate increases,the crack propagation length at the left tip increases,and the growth rate tends to stabilize from fast to slow;the propagation angle of the left tip of the crack increases;the propagation of the right tip of the crack is inhibited.By comparing the propagation rate,propaga-tion length,and propagation angle of subsurface cracks,it can be seen that horizontal or small-angle subsurface crack propagation has little impact on damaged beared life.
rolling bearingsubsurface crackdynamic crack propagationstress distributionextend-ed finite element method(XFEM)
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