SKM 2023 – scientific programme
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BP: Fachverband Biologische Physik
BP 19: Biopolymers, Biomaterials and Bioinspired Functional Materials (joint session CPP/BP)
BP 19.6: Talk
Wednesday, March 29, 2023, 17:45–18:00, MER 02
Nonaffinity controls critical slowing down and rheology near the onset of rigidity — •Abhinav Sharma1, Jordan Shivers2, and Fred MacKintosh2 — 1Leibniz institute for polymer research, Dresden — 2Rice University, Houston, Texas
Fluid-immersed networks and dense suspensions often reside near a boundary between soft (or fluid-like) and rigid (or solid-like) mechanical regimes. This boundary can be crossed either by varying the concentration or by deformation. Near the onset or loss of rigidity, dissipation-limiting nonaffine rearrangements dominate the macroscopic viscoelastic response, giving rise to diverging relaxation times and power-law rheology. Here, we derive a simple relationship between nonaffinity and excess viscosity in fluid-immersed amorphous materials. We then demonstrate this relationship and its rheological consequences in simulations of stress relaxation in strained filament networks and dense suspensions.