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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.
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Berthoud et al. (1998) studied this question.
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