繰り返し転がりすべり接触による半無限体内部介在物からのき裂進展経路と疲労寿命の評価

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This paper deals with the initial crack growth path description emanating from an inclusion and the fatigue life prediction due to repeated rolling/sliding contact on the elastic half-space, accompanied by frictional heat generation. The stress intensity factors are analyzed for the surbsurface crack which is curved from the inclined initial main crack emanating from an inclusion. Rolling/sliding contact is simulated as a Hertzian contact pressure and a frictional load with heat generation which moves with constant velocity over the surface of the half space. The complex variable formulation of Muskhelishivili is used to reduce the problem for the inclusion and kinked crack to the simultaneous Fredholm integral equation of the second kind. This integral equation is solved numerically, thus the stress intensity factors of a kinked crack emanating from an inclusion in a half space can be calculated. Using the maximum energy release rate criterion, the crack growth path can be described. The associated fatigue life also can be predicted by making use of the crack growth law which is assumed by rotating bending fatigue test. The effects of frictional coefficient, slide/roll ratio and the depth of the inclusion on the crack growth path and associated life are considered for a high carbon-chromium bearing steel.
2010-02-25