| Popis: |
A two-body contact is formed between a rectangular polyurethane slab and an epoxy rigid flat. A constant normal load is first applied by pressing the slab against the flat, a tangential load is then imposed by gradually driving the flat from left to right until gross sliding, detected by the sliding of the left or front edge of the slab, is observed. Sliding is established progressively following successive perturbations or waves located at the interface and which travel from the back (right) to the front (left) edge of the plate. These perturbations, called “sliding waves” or “stress waves”, were attributed to the propagation of a shearing mode interface crack. This experimental study gives an accurate phenomenological description of the stress waves. Both loads and displacements are measured continuously and their variations are studied in relation with stress waves travelling. |
