Effect of Local Contact Pressure Considered Plastic Deformation at Contact End and under Micro Size Contact Condition on Rolling Contact Fatigue

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For the improvement of rolling fatigue durability of gears and rolling bearings, the effects of plastic deformation under the local high contact pressure due to end contact or micro size contact on rolling fatigue were explained. (1) The rolling fatigue limit at contact end is depended on the contact width after plastic deformation. (2) The position of rolling fatigue pit initiation is the minimum oil film thickness zone under mixed lubrication condition. (3) Rolling fatigue limit is not influenced by contact size and stress volume under the mixed lubrication condition. The design concept for rolling contact surfaces under plastic contact condition is explained based on the results as above.