Strength of mechanical memories is maximal at the yield point of a soft glass

Mukherji, Srimayee ; Kandula, Neelima ; Sood, A. K. ; Ganapathy, Rajesh (2019) Strength of mechanical memories is maximal at the yield point of a soft glass Physical Review Letters, 122 (15). ISSN 0031-9007

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Official URL: https://doi.org/10.1103/PhysRevLett.122.158001

Related URL: http://dx.doi.org/10.1103/PhysRevLett.122.158001

Abstract

We show experimentally that both single and multiple mechanical memories can be encoded in an amorphous bubble raft, a prototypical soft glass, subject to an oscillatory strain. In line with recent numerical results, we find that multiple memories can be formed sans external noise. By systematically investigating memory formation for a range of training strain amplitudes spanning yield, we find clear signatures of memory even beyond yielding. Most strikingly, the extent to which the system recollects memory is largest for training amplitudes near the yield strain and is a direct consequence of the spatial extent over which the system reorganizes during the encoding process. Our study further suggests that the evolution of force networks on training plays a decisive role in memory formation in jammed packings.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:137892
Deposited On:22 Aug 2025 11:30
Last Modified:22 Aug 2025 11:30

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