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Title: Directed aging, memory, and nature’s greed

Abstract

Disordered materials are often out of equilibrium and evolve very slowly in a rugged and tortuous energy landscape. This slow evolution, referred to as aging, is deemed undesirable as it often leads to material degradation. However, we show that aging also encodes a memory of the stresses imposed during preparation. Because of inhomogeneous local stresses, the material itself decides how to evolve by modifying stressed regions differently from those under less stress. Because material evolution occurs in response to stresses, aging can be “directed” to produce sought-after responses and unusual functionalities that do not inherently exist. Aging obeys a natural “greedy algorithm” as, at each instant, the material simply follows the path of most rapid and accessible relaxation. Our experiments and simulations illustrate directed aging in examples in which the material’s elasticity transforms as desired because of an imposed deformation.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [1]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States); Pennsylvania State Univ., University Park, PA (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States); Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1596356
Grant/Contract Number:  
FG02-03ER46088
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 12; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Aging; memory; pruning; jammed packing; greedy algorithm; Poisson's ratio; auxetic; allostery; directed aging, nonequilibrium statistical physics, mechanical metamaterials

Citation Formats

Pashine, Nidhi, Hexner, Daniel, Liu, Andrea J., and Nagel, Sidney R. Directed aging, memory, and nature’s greed. United States: N. p., 2019. Web. doi:10.1126/sciadv.aax4215.
Pashine, Nidhi, Hexner, Daniel, Liu, Andrea J., & Nagel, Sidney R. Directed aging, memory, and nature’s greed. United States. doi:https://doi.org/10.1126/sciadv.aax4215
Pashine, Nidhi, Hexner, Daniel, Liu, Andrea J., and Nagel, Sidney R. Fri . "Directed aging, memory, and nature’s greed". United States. doi:https://doi.org/10.1126/sciadv.aax4215. https://www.osti.gov/servlets/purl/1596356.
@article{osti_1596356,
title = {Directed aging, memory, and nature’s greed},
author = {Pashine, Nidhi and Hexner, Daniel and Liu, Andrea J. and Nagel, Sidney R.},
abstractNote = {Disordered materials are often out of equilibrium and evolve very slowly in a rugged and tortuous energy landscape. This slow evolution, referred to as aging, is deemed undesirable as it often leads to material degradation. However, we show that aging also encodes a memory of the stresses imposed during preparation. Because of inhomogeneous local stresses, the material itself decides how to evolve by modifying stressed regions differently from those under less stress. Because material evolution occurs in response to stresses, aging can be “directed” to produce sought-after responses and unusual functionalities that do not inherently exist. Aging obeys a natural “greedy algorithm” as, at each instant, the material simply follows the path of most rapid and accessible relaxation. Our experiments and simulations illustrate directed aging in examples in which the material’s elasticity transforms as desired because of an imposed deformation.},
doi = {10.1126/sciadv.aax4215},
journal = {Science Advances},
number = 12,
volume = 5,
place = {United States},
year = {2019},
month = {12}
}

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