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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Fig. 7 . Wear kinetics for sliding contact and different values of sliding friction coefficient μ and strength parameter m

The analysis of the wear kinetics for different values of the sliding friction coefficient and the strength properties of the material shows that at a large value of the sliding friction coefficient ( ) 0.4  = , surface wear prevails. The surface wear rate for a constant sliding friction coefficient depends on the strength properties of the material, given by the parameter m . At low values of the sliding friction coefficient, the wear is accompanied by periodic separation of fragments of the base material of finite thickness; the duration of the regime before the only surface wear takes place, increases with the growth of the parameter m . 5.2. Rolling contact Under conditions of rolling friction, the analysis of the relative slippage effect is of great interest. The study of the principal shear stress distribution developed in Section 4 shows that a change in the relative slippage affects the values of the surface and subsurface maxima of principal shear stress amplitudes and, accordingly, affects the fatigue damage accumulation features within the contacting bodies. Damage functions and the kinetics of wear in rolling contact for sliding friction coefficient 0.3  = and different values of the relative slippage are presented in Fig. 8.

Fig. 8. Accumulated damage and wear kinetics in rolling contact with sliding fr iction coefficient μ = 0.3, strength parameter m = 4 and different relative slippages

The obtained results illustrate that in rolling contact two types of fatigue wear occur: the subsurface fracture (delamination) and the surface wear. The rate and the duration of surface wear and the number of delamination acts, as well as the thickness of separated fragments of the material depend on the relative slippage.