The analyses in this section simulate a block sliding over another block. The models are taken through the following steps:
In Step 1 the contact surfaces are brought together, resulting in the development of contact pressure at the interface.
In Step 2 the secondary surface slides over the main surface to generate friction forces. The
sliding motion is applied with boundary conditions at the top nodes.
In Step 3 the contact pair is removed. The contact constraint ends immediately, and throughout
this step the secondary surface penetrates into the main surface as the
contact forces are ramped down to zero. At the end of this step there is no
stress in the model.
The contact pair is reactivated again in Step 4 by specifying contact interference with an allowed overclosure value. This value has been specified to be equal to the actual overclosure. As this allowed overclosure value ramps down to zero, the contact surfaces come gradually into compliance throughout the step.