Investigation on coupling analysis method of bending fatigue damage and sliding wear damage

Bending fatigue and sliding wear are two main damage forms of mechanical components failure and are widely present in mechanical products. The two damages are interrelated and complicated in active system. Therefore, it is incomplete to use any single damage criterion for the analysis and design. This paper proposes a coupling analysis method of bending fatigue damage and sliding wear damage in typical linear contact. A model of the coupling damage is established and the applicable failure criterion based on damage contribution rate is determined. The rationality and practicability of the coupling analysis method proposed are verified by the example and experiment. It is shown that the equivalent stress increases with increasing of wear depth and normal load, the life of coupling damage reduces, and the typical inflection points appear in the coupling damage life curve, which indicates the failure mode changed.