Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing locally the onset of slippage at a model multi-contact interface   We report on the multi-contact frictional dynamics of model elastomer
surfaces rubbed against bare glass slides. The surfaces consist of layers
patterned with thousands spherical caps (radius of curvature 100 $\mu$m)
distributed both spatially and in height, regularly or randomly. Use of
spherical asperities yields circular micro-contacts whose radius is a direct
measure of the contact pressure distribution. In addition, optical tracking of
individual contacts provides the in-plane deformations of the tangentially
loaded interface, yielding the shear force distribution. We then investigate
the stick-slip frictional dynamics of a regular hexagonal array. For all stick
phases including the initial one, slip precursors are evidenced. They are found
to propagate quasi-statically, normally to the iso- pressure contours. A simple
quasi-static model relying on the existence of interfacial stress gradients is
derived and predicts qualitatively the position of slip precursors.

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The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-lat