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Critical slip and time dependence in sea ice friction

Lishman, B; Sammonds, PR; Feltham, DL; (2013) Critical slip and time dependence in sea ice friction. Cold Regions Science and Technology , 90-91 9 - 13. 10.1016/j.coldregions.2013.03.004. Green open access

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Abstract

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.

Type: Article
Title: Critical slip and time dependence in sea ice friction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.coldregions.2013.03.004
Publisher version: http://dx.doi.org/10.1016/j.coldregions.2013.03.00...
Language: English
Additional information: © 2013 Elsevier B.V. All rights reserved. This work is licensed under a Creative Commons Attribution 3.0 Unported License.
Keywords: Ice, Friction, Critical slip
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1393001
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