Experimental evidence of non-Amontons behaviour at a multicontact interface

Details Experimental evidence of non-Amontons behaviour at a multicontact interface Experimental evidence of non-Amontons behaviour at a multicontact interface

2008-06-10

arxiv.org/abs/0806.1594v1

Europhysics Letters (EPL) 83 (2008) 34003

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/0295-5075/83/34003

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.

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