Aging of the frictional properties induced by temperature variations

Details Aging of the frictional properties induced by temperature variations Aging of the frictional properties induced by temperature variations

2010-06-16

arxiv.org/abs/1006.3257v2

Phys. Rev. E 82, 056108 (2010)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 5 figures, final version, to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.82.056108

The dry frictional contact between two solid surfaces is well-known to obey Coulomb friction laws. In particular, the static friction force resisting the relative lateral (tangential) motion of solid surfaces, initially at rest, is known to be proportional to the normal force and independent of the area of the macroscopic surfaces in contact. Experimentally, the static friction force has been observed to slightly depend on time. Such an aging phenomenon has been accounted for either by the creep of the material or by the condensation of water bridges at the microscopic contacts points. Studying a toy-model, we show that the small uncontrolled temperature changes of the system can also lead to a significant increase of the static friction force.

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