The axisymmetric frictional receding contact of a layer pressed against a half-space by pressure outside a disk

This paper uses a distribution of ring dislocations to find the solution for the frictional axisymmetric receding contact of a semi-infinite layer pressed against a half-space by a uniform surface pressure exerted outside a disk. Three cases are considered: the contact is fully closed and stuck; the contact is fully closed and slipping; the contact is partially open and slipping. The tractions in the contact interface are obtained, as well as the self-determining points of closure and stick