Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Memory of jamming - multiscale models for soft and granular matter   Soft, disordered, micro-structured materials are ubiquitous in nature and
industry, and are different from ordinary fluids or solids, with unusual,
interesting static and flow properties. The transition from fluid to solid -at
the so-called jamming density- features a multitude of complex mechanisms, but
there is no unified theoretical framework that explains them all. In this
study, a simple yet quantitative and predictive model is presented, which
allows for a variable, changing jamming density, encompassing the memory of the
deformation history and explaining a multitude of phenomena at and around
jamming. The jamming density, now introduced as a new state-variable, changes
due to the deformation history and relates the system's macroscopic response to
its microstructure. The packing efficiency can increase logarithmically slow
under gentle repeated (isotropic) compression, leading to an increase of the
jamming density. In contrast, shear deformations cause anisotropy, changing the
packing efficiency exponentially fast with either dilatancy or compactancy. The
memory of the system near jamming can be explained by a microstatistical model
that involves a multiscale, fractal energy landscape and links the microscopic
particle picture to the macroscopic continuum description, providing a unified
explanation for the qualitatively different flow-behavior for different
deformation modes. To complement our work, a recipe to extract the
history-dependent jamming density from experimentally accessible data is
proposed, and alternative state-variables are compared. The proposed simple
macroscopic constitutive model is calibrated with the memory of microstructure.
Such approach can help understanding predicting and mitigating failure of
structures or geophysical hazards, and will bring forward industrial process
design/optimization, and help solving scientific challenges in fundamental
research.

15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys