Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Static friction at fractal interfaces   Tribological phenomena are governed by combined effects of material
properties, topology and surface-chemistry. We study the interplay of
multiscale surface structures with molecular-scale interactions towards
interpreting static frictional interactions at fractal interfaces. By
spline-assisted-discretization we analyse asperity interactions in pairs of
contacting fractal surface-profiles. For elastically deforming asperities,
force analysis reveals greater friction at surfaces exhibiting higher
fractality, with increasing molecular-scale friction amplifying this trend.
Increasing adhesive strength yields higher overall friction at surfaces of
lower fractality owing to greater true-contact-area. In systems where
adhesive-type interactions play an important role, such as those where
cold-welded junctions form, friction is minimised at an intermediate value of
surface profile fractality found to be around 1.3 to 1.5. Results have
implications for systems exhibiting evolving surface structures.

9
The categories of this paper are: nlin
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys