Physical analysis of the state- and rate-dependent friction law: Static friction
| Autor: | C. G’Sell, T. Baumberger, J.-M. Hiver, P. Berthoud |
|---|---|
| Přispěvatelé: | Unité d'Agronomie de Laon-Péronne ( LILL LAON AGRO), Institut National de la Recherche Agronomique (INRA) |
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Materials science Condensed matter physics [SDV]Life Sciences [q-bio] Rate dependent 02 engineering and technology Polymer 021001 nanoscience & nanotechnology 01 natural sciences Amorphous solid Condensed Matter::Soft Condensed Matter Natural rubber Shear (geology) chemistry visual_art [SDE]Environmental Sciences 0103 physical sciences Thermal visual_art.visual_art_medium Dynamical friction Adhesive 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review B: Condensed Matter (1978-1997) Physical Review B: Condensed Matter (1978-1997), American Physical Society, 1999, 59 (22), pp.14313-14327 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.59.14313 |
| Popis: | We report an extensive study of dynamic friction at nonlubricated multicontact interfaces between nominally flat bodies, rough on the micrometer scale, made of identical polymer glasses. This work, which complements a previous study of static friction on the same systems, has been performed at temperatures ranging from $20\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ to close below the glass transitions. The data are analyzed within the framework of the Rice-Ruina state- and rate-dependent friction model. We show that this phenomenology is equivalent to a generalized Tabor decomposition of the friction force into the product of an age-dependent load-bearing area and of a velocity-strengthening interfacial shear stress. Quantitative analysis of this latter term leads to associate velocity strengthening with thermal activation of basic dynamical units of nanometer dimensions. We interpret our results with the help of a model due to Persson, in which shear is localized in a nanometer-thick interfacial adhesive layer, pinned elastically at a low shear level. Sliding proceeds via uncorrelated depinning of ``nanoblocks'' which constitute the layer. It is the competition between the drive-induced loading of these blocks up to their depinning stress and the thermally activated premature depinning events which leads to the velocity-strengthening contribution to the interfacial strength. In our interpretation, friction therefore appears as the localized elastoplastic response of a confined amorphous interfacial layer. |
| Databáze: | OpenAIRE |
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