The literature presents a lot of works using the Hertz contact Model to simplify the conclusions, but with motion and the presence of roughness, this model cannot be used anymore. How to evaluate the real area of contact in the running of process?
First of all, I think your question requires estimating the level of plastic deformation in your tribossystem. Depends on it, a model can be chosen. Probably, elasto-plastic models can be applied, but this topic is a hot topic in the literature. Regards.