Rolling contact is one of the main contact modes of all kinds of mechanical equipment at present. This investigation studied the rolling contact fatigue behaviors under various slip ratios and surface roughness with the consideration of loading history, loading sequence, and mutual influence between different load levels. In this paper, a fatigue crack initiation life prediction model based on strain energy accumulation caused by slip dislocations is proposed. The effect of increasing slip dislocation density and friction resistance on strain energy accumulation under alternating load is studied. The experimental results show that compared with the existing models, the proposed model can effectively improve the prediction accuracy of contact fatigue life under variable stress loading.
The relationship between heat energy and initial fatigue life of different metals under multi-level loading stress and elevated temperature is introduced. The fatigue damage evolution model was established from the microscopic and mesoscopic perspectives to explore the fatigue damage and the crack initiation location at elevated temperature. Based on the method of continuous damage mechanics, the influence of multi-level loads on fatigue cracking life and heat energy on strain energy of distribution were investigated. The mathematical model is verified by the experimental data. The model has important engineering significance for predicting the service life of parts at elevated temperature. K E Y W O R D S elevated temperature, fatigue crack, heat energy, multi-level load, multi-scale Highlights 1. Fatigue damage model is established by the coupling of microcosmic and microcosmic.2. The relationship between heat energy and fatigue life is discussed.3. The influence of heat energy on sub-surface damage of parts was investigated.4. Considering the influence of heat energy to improve the accuracy of fatigue model.
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