PSI - Issue 41

Irina Goryacheva et al. / Procedia Structural Integrity 41 (2022) 220–231 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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The curves of the wear kinetics in conditions of rolling friction for different values of relative slippage are presented in Fig. 9.

Fig. 9 . Wear kinetics for rolling contact with μ = 0.3, m = 4 and different values of relative slippage

The results indicate that in rolling contact the surface wear alternates with acts of subsurface fracture (delamination), and the rate of surface wear is constant and depends on the relative slippage. For sliding friction coefficient equals to 0.3 and large value of relative slippage ( Δ = 0.0045), which corresponds to the complete slip in the contact region a single act of delamination occurs, after which, with an increase in the number of cycles, a regime of surface wear with a constant rate is established. 6. Conclusion The paper presents a model, developed to describe the fatigue damage accumulation and surface and subsurface (delamination) wear under conditions of frictional interaction of elastic bodies. The sliding and rolling contacts of elastic bodies were considered, and the sliding friction coefficient, the relative slippage and the strength properties of the material of elastic bodies were used as variable parameters. The obtained results illustrate the evolution of the accumulated damage function with an increasing number of cycles, as well as the change of the wear behavior from acts of subsurface fracture (delamination) to continuous surface wear with a constant rate. It is shown that the surface wear dominates in sliding contact for the sliding friction coefficient equals to 0.4. At low values of the sliding friction coefficient, there is an alternation of subsurface fracture (delamination) and surface wear. In rolling contact of elastic bodies, the wear rate increases with the growth of the relative slippage, which is accompanied by a change of wear behavior from subsurface to surface. The results of the study are used to analyze the influence of the mechanical and strength characteristics of materials of interacting bodies, as well as the sliding friction coefficient under conditions of sliding friction and additionally relative slippage in rolling contact on fatigue wear features. Acknowledgements The reported study was funded by RFBR, Sirius University of Science and Technology, JSC Russian Railways and Educational Fund “Talent and success”, project number 20-38-51005. References Bernal, E., Spiryagin, M., Vollebregt, E., Oldknow, K., Stichel, S., Shrestha, S., Ahmad, S., et al. (2022), “Prediction of rail surface damage in locomotive traction operations using laboratory- field measured and calibrated data”, Engineering Failure Analysis , Vol. 135, p. 106165. Collins, J.A. (1981), Failure of Materials in Mechanical Design , A Wiley-In., New York. Dang Van, K., Cailletaud, G., Flavenot, J.F., Douaron, A. Le and Lieurade, H.P. (1989), “Criterion for High Cycle Fatigue Fai lure Under