The contact buckling, caused by some rotation at the surface material due to mutual partial gripping of bodies during friction contact, with leads to the loss of stable state, is described. Material before such gripped spots takes the shape of buckle and its shear strain transforms into the compression strain. The rotation generated by the buckle propagates along the surface and causes further buckling. Such pattern is typical for loss of stable state of two elastic rough bodies under shear loading as a whole and it corresponds to the static friction coefficient.
The Surface Buckling in Static and Dynamic Rough Contact of Solids
Riznychuk, RV. "The Surface Buckling in Static and Dynamic Rough Contact of Solids." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 1. Washington, D.C., USA. September 12–16, 2005. pp. 417-418. ASME. https://doi.org/10.1115/WTC2005-64233
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