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Strength of Mechanical Memories is Maximal at the Yield Point of a Soft Glass

Mukherji, Srimayee and Kandula, Neelima and Sood, AK and Ganapathy, Rajesh (2019) Strength of Mechanical Memories is Maximal at the Yield Point of a Soft Glass. In: PHYSICAL REVIEW LETTERS, 122 (15).

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Official URL: https://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: Journal Article
Additional Information: Copyright of this article belongs to AMER PHYSICAL SOC.
Keywords: FORCES; CHAOS
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Ms Ranganayaki RS
Date Deposited: 21 May 2019 13:01
Last Modified: 21 May 2019 13:01
URI: http://eprints.iisc.ac.in/id/eprint/62588

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