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Contribution to the simplified modelling of rolling contact mechanic

Contributions à la modélisation simplifiée de la mécanique des contacts roulants

Abstract : Numerical simulation of superficial wear requires the implementation of computational tools for calculation of dissipated power during loaded contacts of roller on track cam [1]. Uncertainties due to geometrical defects or to not well known parameters such as the friction ratio for example, yields to a probabilistic approach [2] of the contact problem. Number of simulated cases becomes very important (approximately 1000 cases for a single geometry and loading) and cannot reasonably be treated by the exact approach which leads to long CPU time. A simplified approach was chosen to calculate the dissipated power for nonhertzian case generated by the wear. To quantify the precision of this approach, we present and discuss the choices which had been made. In particular, the simplified approach proposed by Kalker [3] is compared with the solutions of the exact approach, then we propose improvement of semi-hertzian approaches which are presented in [4].