Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G26: Active and Externally Driven Granular Matter I
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-187B
Sponsoring
Units:
DSOFT GSNP
Chair: Alberto Fernandez-Nieves, University of Barcelona
Abstract: G26.00013 : Acoustically Induced Superthickening and Enhanced Elasticity in Shear Jamming Dense Colloidal Suspensions*
2:18 PM–2:30 PM
Presenter:
Edward Ong
(Cornell University)
Authors:
Edward Ong
(Cornell University)
Meera Ramaswamy
(Cornell University)
Itai Cohen
(Cornell University)
The application of a transient acoustic perturbation (training) prior to shear jamming was shown to result in the suspension remaining shear jammed when later exposed to a perturbation (testing) that would have otherwise resulted in unjamming. The state of the suspension prior to testing was studied via rate cessation and small amplitude oscillatory shear (SAOS). It was found that the stress relaxation timescale increases with the power applied during training. Strikingly, beyond a critical training power, the stress increases instead of decaying during cessation. SAOS experiments show that the storage modulus immediately before testing increases with training power. As SAOS is applied, the storage modulus decays and reaches a stable value which can be orders of magnitude larger for large training powers when compared to an untrained suspension.
Training was also found to significantly reduce the time taken for shear jamming to occur, promoting what would have been a discontinuously shear thickening phase to a shear jamming phase. These results demonstrate the tremendous potential acoustic perturbation has for controlling the flow and elasticity of dense colloidal suspensions.
*Agency of Science Technology and Research, Singapore NSS (Ph.D.) award;NSF CBET award numbers: 2010118, 1804963, 1509308;NSF DMR award numbers:1719875 and 1507607
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