Paper Number
PO32 

Session
Poster Session

Title
Stress-stress correlations reveal force chains in gels

Presentation Date and Time
October 12, 2022 (Wednesday) 6:30

Track / Room
Poster Session / Riverwalk A

Authors (Click on name to view author profile)

  1. Vinutha, H A (Georgetown University, Institute for Soft Matter Synthesis and Metrology)
  2. Mao, Xaioming (University of Michigan)
  3. Chakraborty, Bulbul (Brandeis University, Martin Fisher School of Physics)
  4. Del Gado, Emanuela (Georgetown University, Department of Physics)

Author and Affiliation Lines (in printed abstract book)
H A Vinutha1, Xaioming Mao2, Bulbul Chakraborty3 and Emanuela Del Gado1
1Department of Physics, Georgetown University, Washinton, DC 20057; 2University of Michigan, Ann Arbor, MI; 3Martin Fisher School of Physics, Brandeis University, Waltham, MA 02453

Speaker / Presenter 
Vinutha, H A

Keywords
theoretical methods; computational methods; gels; jammed systems

Text of Abstract
Many soft materials get arrested or solidify in a disordered state, for example, granular materials, gels, glasses, and polymers. The mechanical behavior of these soft materials can be tuned easily, for example, in granular materials by controlling pressure. The stress response of amorphous solids is determined by a complex interplay between structure, interparticle or surface interactions, and boundary conditions (or external driving). We use a recently developed theoretical framework for athermal and nonergodic assemblies of particles or grains to compute the spatial correlations of microscopic stresses in cohesive gels, and connect those spatial correlations to the local constraints of force and torque balance and to the emergence of rigid structures during solidification. From the stress-stress correlations we can obtain the elastic modulus tensor and analyze its dependence on the preparation protocol and its consequences for the anisotropy of the structures and of the stress transmission. We also wish to extend these analysis techniques to understand stress response in a wider class of systems like jammed suspensions, shear thickening materials, and cement.