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Title: Origin of Two Distinct Stress Relaxation Regimes in Shear Jammed Dense Suspensions
Authors: Barik, Sachidananda
Majumdar, Sayantan
Keywords: Jamming
Non Newtonian Fluids
Issue Date: 23-Jun-2022
Publisher: American Physical Society
Citation: Physical Review Letters 2022, Vol.128, p258002
Abstract: Many dense particulate suspensions show a stress induced transformation from a liquidlike state to a solidlike shear jammed (SJ) state. However, the underlying particle-scale dynamics leading to such striking, reversible transition of the bulk remains unknown. Here, we study transient stress relaxation behaviour of SJ states formed by a well-characterized dense suspension under a step strain perturbation. We observe a strongly nonexponential relaxation that develops a sharp discontinuous stress drop at short time for high enough peak-stress values. High resolution boundary imaging and normal stress measurements confirm that such stress discontinuity originates from the localized plastic events, whereas system spanning dilation controls the slower relaxation process. We also find an intriguing correlation between the nature of transient relaxation and the steady-state shear jamming phase diagram obtained from the Wyart-Cates model.
Description: Restricted Access.
ISSN: 0031-9007
1079-7114 (Online)
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Copyright: 2022 American Physical Society
Appears in Collections:Research Papers (SCM)

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