Effect of aging on the non-linear elasticity and memory formation in materials
16 Aug 2020
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Hexner Daniel
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Pashine Nidhi
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Liu Andrea J.
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Nagel Sidney R.
Disordered solids often change their elastic response as they slowly age. Using experiments and simulations, we study how aging disordered planar
networks under an applied stress affects their nonlinear elastic response...We
are able to modify dramatically the elastic properties of our systems in the
non-linear regime. Using simulations, we study two models for the microscopic
evolution of properties of such a material; the first considers changes in the
material strength while the second considers distortions in the microscopic
geometry. Both models capture different aspects of the experiments including
the encoding of memories of the aging history of the system and the dramatic
effects on the material's nonlinear elastic properties. Our results demonstrate
how aging can be used to create complex elastic behavior in the nonlinear
regime.(read more)