Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of shape disorder in the collective behaviour of aligned
  fibrous matter   We study the compression of bundles of aligned macroscopic fibers with
intrinsic shape disorder, as found in human hair and in many other natural and
man-made systems. We show by a combination of experiments, numerical
simulations and theory how the statistical properties of the shapes of the
fibers control the collective mechanical behaviour of the bundles. This work
paves the way for designing aligned fibrous matter with pre-required properties
from large numbers of individual strands of selected geometry and rigidity.

0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg