Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Packing Transitions in the Elastogranular Confinement of a Slender Loop   Confined thin structures are ubiquitous in nature. Spatial and length
constraints have led to a number of novel packing strategies at both the
micro-scale, as when DNA packages inside a capsid, and the macro-scale, seen in
plant root development and the arrangement of the human intestinal tract. By
varying the arc length of an elastic loop injected into an array of
monodisperse, soft, spherical grains at varying initial number density, we
investigate the resulting packing behaviors between a growing slender structure
constrained by deformable boundaries. At low initial packing fractions, the
elastic loop deforms as though it were hitting a flat surface by periodically
folding into the array. Above a critical packing fraction $\phi_c$, local
re-orientations within the granular medium create an effectively curved surface
leading to the emergence of a distinct circular packing morphology in the
adjacent elastic structure. These results will bring new insight into the
packing behavior of wires and thin sheets and will be relevant to modeling
plant root morphogenesis, burrowing and locomotive strategies of vertebrates &
invertebrates, and developing smart, steerable needles.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th