高面圧下のフレッティング疲労強度とその破壊力学による検討(<特集>破壊力学)

概要

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Fretting fatigue fractures of industrial machines often occur at the point where high contact pressure occurs due to an uneven contact. In this study, fretting fatigue tests were performed under high contact pressure applied by linecontact conditions using 12-Cr steel with parameters of the mean stress and the material strength. It was shown that the fretting fatigue strength decreased slightly with increasing the contact pressure and became minimum when Hertz's average contact pressure is about 1.5 times of 0.2% proof stress, σ_0.2. I also showed that test results concerning the fretting fatigue strength and the non-propagating crack length can be successfully explained by the microcrack propagation model in which a micro-crack can propagate when its stress intensity factor range, ΔK is greater than the threshold value, ΔK_<th> considering small crack size effects and mean stress effects.
2006-12-15