The friction of ice on ice at low sliding velocities
Autor: | F. E. Kennedy, D. E. Jones, Erland M. Schulson |
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Rok vydání: | 2000 |
Předmět: | |
Zdroj: | Philosophical Magazine A. 80:1093-1110 |
ISSN: | 1460-6992 0141-8610 |
Popis: | The kinetic coefficient of friction μ has been measured for both freshwater, granular ice and saltwater, columnar ice sliding against itself. The variables were ambient temperature (−3°C to −40°C), sliding velocity (5 × 10−7 −5 × 10−2 ms−1), normal pressure (0.007–1.0 MPa) and grain size (2.5–6.0 mm). Generally, μ decreased with increasing velocity and with increasing temperature, but was relatively insensitive to both pressure and grain size over the ranges investigated. At the lower temperatures (−30°C and −40°C) the frictionvelocity curve exhibited a peak at intermediate velocities. The friction coefficients for freshwater and saltwater ice were almost indistinguishable at higher temperatures (−3°C and −10°C), but saline ice had lower friction at lower temperatures. The results are explained in terms of frictional heating, creep and fracture. |
Databáze: | OpenAIRE |
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