摩擦型継手のフレッティング疲労強度に及ぼす面圧の影響

概要

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In friction-type joints where vibratory load is carried only by friction, the effect of contact pressure on fretting fatigue strength differs from that observed in conventional pad-type load-carrying tests. In this study, in order to clarify the effect and the mechanism of contact pressure in friction-type tests, we performed fatigue tests measuring changes in strain distribution with repetition and finite element (FE) analyses focusing on the shifting of actual contact edges. It was found that fatigue limits decreased as contact pressure decreased, and the minimum limits were observed at certain contact pressure. We clarified that the reduction in fatigue strength that occurred with decreasing contact pressure was caused by increasing stress concentration due to shifting of the actual contact edge, and decreasing compressive mean stress. The actual contact edges were confirmed to be positioned inside the contact surface under low contact-pressure conditions, and to move inwardly from the initial edge with the repetition of cycles under high relative-slip-range conditions. We also showed that fatigue limits can be explained well considering the shifting of the actual contact edge using the local reference stresses (mean stress and principal stress amplitude) specially defined in this study.
2009-07-25