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. 2. Dependences of the principal shear stress amplitude on depth in sliding contact for different values of sliding friction coefficient

The results indicate that the distribution of the principal shear stress amplitudes on the depth in the elastic half space under the sliding body has two maxima: at the surface and below the surface. For the selected values of the dimensionless parameters (14) and the sliding friction coefficient not exceeding 0.2, the surface maximum of the principal shear stresses amplitude function is less than the subsurface maximum. With an increase in the sliding friction coefficient (for 0.2   ), the surface maximum of the function ( ) z   becomes greater than the subsurface maximum of this function. In rolling contact there are two main parameters which influence essentially on the dependence of the principal shear stress amplitude on the depth: they are the relative slippage and the sliding friction coefficient. Fig. 3 illustrates the influence of the relative slippage and the sliding friction coefficient on the distribution of the principal shear stresses amplitudes.

Fig. 3. Dependencies of the principal shear stress amplitude on depth in rolling contact for different values of relative slippage and sliding friction coefficient

The results illustrate that in the rolling contact a change in the relative slippage significantly affects the surface maximum value of principal shear stresses amplitudes, while the subsurface maximum value practically does not change. At low values of the relative slippage, the surface maximum of principal shear stress amplitudes is less than the subsurface one. With an increase in the relative slippage up to a value corresponding to the total slip in the contact region ( ) 0.0045  = , the surface and subsurface maxima values become comparable. At the same value of relative slippage, the increase in the sliding friction coefficient corresponds to the increase in the surface and subsurface maxima of principal shear stresses amplitudes, and the surface maximum changes significantly.