Paper Number
GG34
Session
Rheology of Gels, Glasses and Jammed Systems
Title
Uncovering distinct contributions to the shear-stress of dense packings of soft spheres
Presentation Date and Time
October 11, 2022 (Tuesday) 5:25
Track / Room
Track 3 / Sheraton 5
Authors
- Vinutha, H. A. (Georgetown University, Physics)
- Marchand, Manon (Fribourg University)
- Vasisht, Vishwas (Indian Institute of Technology, Physics)
- Caggioni, Marco (Procter & Gamble)
- Trappe, Veronique (Fribourg University)
- Del Gado, Emanuela (Georgetown University, Department of Physics)
Author and Affiliation Lines
H. A. Vinutha1, Manon Marchand2, Vishwas Vasisht3, Marco Caggioni4, Veronique Trappe2 and Emanuela Del Gado1
1Department of Physics, Georgetown University, Washinton, DC 20057; 2Fribourg University, Fribourg, Switzerland; 3Physics, Indian Institute of Technology, Palakkad, India; 4Procter & Gamble, West Chester, OH
Speaker / Presenter
Vinutha, H. A.
Keywords
experimental methods; computational methods; glasses; jammed systems; suspensions
Text of Abstract
In yield stress fluids, such as jammed suspensions of soft particles, the rate-dependent rheology is due to microscopic processes building up stress anisotropies. To investigate these processes we perform flow cessation simulations and experiments at various points along the flow curve. We combine experimental rheological tests with the analysis of microscopic stresses, structure, and particle displacements from simulations for different solvent viscosity and sample preparation protocols. Our study reveals a sequence of stress relaxation mechanisms: the first is associated with the elastic motion of particles, which relaxes the microscopic stresses accumulated along the compressive direction under flow, and the second is associated with a more collective reorganization of the particle packing. Our results show how these mechanisms for stress relaxation can emerge from the yielding of soft solid materials.