Exploring the effect of geometric coupling on friction and energy dissipation in rough contacts of elastic and viscoelastic coatings

We study the frictional behavior of both elastic and viscoelastic thin coatings bonded to a seemingly rigid substrate sliding against rough profile in presence Coulomb friction at interface. The aim is explore effect coupling between normal tangential displacement fields arising from finiteness material thickness quantify contribution this can have on energy losses. found that, due normal–tangential coupling, asymmetric contacts consequently additional are observed even for purely layers, indeed associated with zero bulk dissipation. Furthermore, enhanced reported case time also entailing larger Geometric introduces interactions involving scales displacements, which leads significant increase contact area, under given load, compared uncoupled contacts. These results show interfaces deformable coating significantly stiffer substrate, interfacial shear stresses cannot be neglected.