Experimental study on residual stress distribution in surface layer of rolling bearing inner ring raceway

Taking the B7008C/P4 bearing inner ring raceway for example, the residual stress distributions in the surface layers were measured by layer removal and X-ray diffraction. Finite element method was used to analyze the stress relaxation due to layer removal, which can correct the stress measurements. The results show that the maximum relative error between measured residual stress and corrected residual stress is 3.9%, while the thicknesses of the removed layers are micron scale. Besides, the errors increase with the increasing thicknesses of removed layers. The comparative analysis between domestic and foreign B7008C/P4 bearings show that the foreign bearing inner ring raceways have greater surface compressive residual stress and deeper depth of severely reduced compressive residual stress, which is more conducive to improve bearing fatigue life. ©, 2015, Huazhong University of Science and Technology. All right reserved.