| Issue |
Europhys. Lett.
Volume 41, Number 6, March II 1998
|
|
|---|---|---|
| Page(s) | 617 - 622 | |
| Section | Classical areas of phenomenology | |
| DOI | https://doi.org/10.1209/epl/i1998-00202-4 | |
| Published online | 01 September 2002 | |
Role of asperity creep in time- and velocity-dependent friction of a polymer glass
Laboratoire de Physique de la Matière Condensée, École Normale
Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
Received:
15
October
1997
Accepted:
29
January
1998
We study time-strengthening and velocity-weakening friction of poly(methyl methacrylate) from room temperature up to the glass transition. The role of creep of asperities under normal load is systematically investigated. It is confirmed to be a primary cause of ageing of the static friction force. Velocity weakening is also strongly enhanced on approaching the glass transition, whence promoting stick-slip oscillations. The quantitative analysis of sliding friction, based on a widely used rule of "time and velocity equivalence”, is found to be inadequate in the transition region.
PACS: 46.30.Pa – Friction, wear, adherence, hardness, mechanical contacts, and tribology / 62.20.Hg – Creep / 68.35.Gy – Mechanical and acoustical properties; adhesion
© EDP Sciences, 1998
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