کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6427009 | 1634471 | 2013 | 5 صفحه PDF | دانلود رایگان |
- Sea ice friction shows memory, which decays over a fixed time.
- A rate-and-state model can be used to quantify this memory.
- Model predictions agree well with experimentally measured dynamic friction.
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 10Â s. We then discuss the implications of this finding for modelling sea ice friction and for our understanding of friction in general.
Journal: Cold Regions Science and Technology - Volumes 90â91, June 2013, Pages 9-13