Experimental evidence of non-Amontons behaviour at a multicontact interface

Abstract

We report on normal stress field measurements at the multicontact interface between a rough elastomeric film and a smooth glass sphere under normal load, using an original MEMS-based stress sensing device. These measurements are compared to Finite Elements Method calculations with boundary conditions obeying locally Amontons' rigid-plastic-like friction law with a uniform friction coefficient. In dry contact conditions, significant deviations are observed which decrease with increasing load. In lubricated conditions, the measured profile recovers almost perfectly the predicted profile. These results are interpreted as a consequence of the finite compliance of the multicontact interface, a mechanism which is not taken into account in Amontons' law.

References in corpus (3)

• Solid Friction from stick-slip to pinning and aging
• Contact mechanics: relation between interfacial separation and load
• Non-Amontons behavior of friction in single contacts

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