Paper Number
CS3 My Program
Session
Colloidal Suspensions and Granular Materials
Title
Stored elasticity, emerging plasticity, and recovery of rigidity in yield stress fluids
Presentation Date and Time
October 20, 2025 (Monday) 10:30
Track / Room
Track 1 / Sweeney Ballroom A
Authors
- Bayer, Logan (Georgetown University, Department of Physics)
- Vinutha, H A (Department of Physics, Georgetown College, Georgetown Univer)
- Del Gado, Emanuela (Georgetown University, Department of Physics)
Author and Affiliation Lines
Logan Bayer, H A Vinutha and Emanuela Del Gado
Department of Physics, Georgetown University, Washington, DC 20057
Speaker / Presenter
Bayer, Logan
Keywords
computational methods; granular materials; non-Newtonian fluids; particualte systems; rheometry; suspensions
Text of Abstract
Yield stress fluids easily build-up residual stresses. We have used large-scale simulations of soft jammed particles to disentangle the role of stored elasticity and the emerging plasticity during stress relaxation to understand the build-up of residual stress [2]. Our simulations provide evidence of a power-law distribution of inter-times between plastic events which underpin the power-law decay in the stress relaxation. The plastic events are identified by the change in locally stiffer (icosahedrally-packed) regions. The number of icosahedrally-packed regions increase and rearrange over time as the system recovers mechanical equilibrium. Our results suggest that the recovery of rigidity may be related to a percolation of these locally stiffer regions which controls the residual stress build-up. We discuss these results in the context of elastoplastic models and recent experiments [1]. [1] Vinutha, HA et al., “Memory of shear flow in soft jammed materials”, PNAS Nexus 3 (2024): 441 [2] Vinutha, HA, Bayer, L., and Del Gado, E., in preparation (2025)