Critical stresses and strains at the spall edge of a case hardened bearing due to ball impact

Effects of spall edge profiles on the edge plastic deformation for a roller bearing

“…Figure 7 plots the edge plastic deformations for the sharp profile. It can be seen from Figure 7 that the propagated profile for the sharp edge looks like the cylindrical one, which is similar as that given in Branch et al 17 Figures 8 to 10 plot the edge plastic deformations for the cylindrical profile case I, II, and III, respectively. Here, to show a clear details, the edge plastic deformations in Figures 8 to 10 are the enlarged view of 20 times.…”

“…The length of the raceway (L e ) is 7 mm. Two different edge profiles are assumed according to the results in Branch et al 17 First type is defined as undeformed edge, as shown in Figure 5(b), which denotes the beginning stage of the localized fault. Second type is defined as deformed edge, as shown in Figure 5(c), which denotes the late stage of the localized fault.…”

“…Kadin and Rychahivskyy 16 established a 2D FE model based on the linear elastic fracture mechanics method to study the influences of the crack shape and depth, frictions, and contact load on the crack propagation for a ceramic ball bearing. Branch et al 17 introduced a static elastic-plastic FE model to analyze the stress distribution at the spall edge for a ball bearing. The stress was used to predict the spall edge propagation.…”

“…A bilinear kinematic hardening material model is used in the FE model, which can formulate the elastic-plastic deformations. The studied spall edge profiles are assumed to be sharp and cylindrical ones according to the experimental results in Branch et al 17 These two profiles denote the initial and propagated spall edges, respectively. To validate the FE model, the contact deformations between the rolling element and the raceway from the proposed model and Hertzian contact theory are compared.…”

The influence of the raceway thickness on the dynamic performances of a roller bearing

“…In the above FE models, some works [17][18][19]23,24,28 applied the static FE method to simulate the contact stress and fatigue life of the rolling element-raceway contact, which cannot formulate the bearing vibrations. Moreover, some works [20][21][22]27 used the dynamic FE models to simulate the contact forces, the contact stresses, and the vibrations of the roller and ball bearings.…”