転がり疲労の機構とモードII疲労き裂進展 : モードII疲労き裂進展試験法についての提案

概要

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From the fractographic observation on silicon nitride specimens failed under rolling contact fatigue, it has been found that the crack initation in silicon nitride specimens subjected to rolling contact fatigue is induced by cyclic subsurface shearing stress, as is known in steel bearings. Though these subsurface cracks are produced in the direction parallel to the cyclic shearing stress, cracks grow in the direction near to the plane of the maximum tensile stress if mode II loading is applied to them. The difference between the crack growth in simple mode II loading and the crack growth in rolling contact fatigue is, we suppose, whether or not there is a superimposed compression stress. Based on this hypothesis, we developed an apparatus to obtain intrinsic mode II fatigue crack growth characteristics, as a simplified model of determining the subsurface crack growth in rolling contact fatigue. Some preliminary results on da/dN-ΔK_<II> relations have been obtained by using this apparatus on a steel and aluminum alloys.
社団法人日本材料学会の論文
1994-01-15