転がり疲労はく離形状に関する破壊力学的検討

概要

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Ball-on-plate type rolling contact fatigue tests for a bearing steel JIS-SUJ 2 were carried out, and the influences of the applied load on the morphologies of the flaking failure were investigated. In order to try to describe the morphologies, stress intensity factor range ⊿K_<II>, ⊿K_<III> for the subsurface crack subjected to cyclic loading of contact stress were estimated by using a simplified crack model. It was found that ⊿K_<II> for a crack with a fixed radius indicated a maximum value at a certain depth, and the depth agreed well with the maximum flaking depth obtained experimentally. The length and the width of the flaking failure were also discussed by the variations of ⊿K_<II>, ⊿K_<III> with the change of the crack radius. The flaking width estimated from the comparison of ⊿K_<III> and its threshold value for fatigue crack growth was considerably close to experimental value.
2004-01-25