Journal
COLD REGIONS SCIENCE AND TECHNOLOGY
Volume 90-91, Issue -, Pages 9-13Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coldregions.2013.03.004
Keywords
Ice; Friction; Critical slip
Funding
- National Environmental Research Council
- European Community [022441 (RII3)]
- Leverhulme Trust
- Natural Environment Research Council [NER/A/S/2001/00640] Funding Source: researchfish
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Recent research into sea ice friction has focussed on ways to provide a model which maintains much of the clarity and simplicity of Amonton's law, yet also accounts for memory effects. One promising avenue of research has been to adapt the rate- and state- dependent models which are prevalent in rock friction. In such models it is assumed that there is some fixed critical slip displacement, which is effectively a measure of the displacement over which memory effects might be considered important. Here we show experimentally that a fixed critical slip displacement is not a valid assumption in ice friction, whereas a constant critical slip time appears to hold across a range of parameters and scales. As a simple rule of thumb, memory effects persist to a significant level for 10 s. We then discuss the implications of this finding for modelling sea ice friction and for our understanding of friction in general. (C) 2013 Elsevier B.V. All rights reserved.
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