FORMULATION AND IMPLEMENTATION OF CONDITIONS FOR FRICTIONAL CONTACT

Finite element implementations of the classical (stick-slip) and a regularized (elastic-slip) friction laws are compared for a class of non-linear slip criteria. The fully implicit method is used for integrating the friction law. A novel implementation of the stick-slip law, that involved transformation to a non-orthogonal coordinate system at each contact point, is assessed. A numerical comparison is carried out for a simple problem, that has previously been analysed in the literature. The convergence of the elastic-slip law for increasing stiffness is evaluated in addition to convergence behaviour of the adopted Newton iterations for a given law.