Abstract
Three kinds of cracks are considered for the tribological failure process. First, two-dimensional multiple surface cracks are analyzed. The stress intensity factors of the multiple surface cracks are calculated, and the noticeable effects on the crack growth are investigated. Second, as a more realistic model, a three-dimensional analysis is considered for straight growth of the planar surface crack. On the basis of the stress intensity factors at the crack front, and using the fatigue crack growth law for cemented carbide, silicon nitride, and bearing steel, the three-dimensional fatigue crack growth contour and the fatigue crack propagation life are predicted. Finally, corresponding to the curved crack, a two-dimensional multiple kinked crack in a half-space is considered. On the basis of the stress intensity factors, and using the fatigue crack growth law for the bearing steel, the two-dimensional fatigue crack growth path and the fatigue crack propagation life are predicted. In addition, the thermomechanical effects such as the frictional coefficient, sliding/rolling ratio, and the crack-face fluid pressure on the fatigue crack propagation life and induced fatigue pitting failures are considered.
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