Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session F03: Microinertia Effects in Particulate Flows
11:15 AM–2:15 PM,
Tuesday, March 6, 2018
LACC Room: 150C
Sponsoring Unit: GSOFT
Chair: Antony Beris, Univ of Delaware
Abstract: F03.00012 : Traction Force Rheology: a new technique to understand the mechanics of colloidal solids
1:51 PM–2:03 PM
We present recent results on the structural and mechanical response of colloidal solids in response to externally imposed shear strain. We introduce a new technique, traction force rheology, that combines confocal and traction force microscopy. Using this technique, we simultaneously visualize the structural changes occurring within a colloidal solid during elastic and plastic deformation, and directly measure the mechanical response of the colloidal solid. We present stress-strain curves, measured in-situ, combined with full visualization of the mechanisms occurring within the colloidal solid at every point along the stress-strain curve. For colloidal polycrystals, these mechanisms include dislocation dynamics, grain boundary sliding, and grain refinement; for colloidal glass we visualize shear transformations. Experimental details, challenges, and current results will be discussed.
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