Criticality in sheared, disordered solids. I. Rate effects in stress and diffusion

Simulstion of Gas Diffusion in Capillaries and Porous Solids

Simulstion of Gas Diffusion in Capillaries and Porous Solids

Nonlinear stress and fluctuation dynamics of sheared disordered wet foam.

A sheared wet foam, which stores elastic energy in bubble deformations, relaxes stress through bubble rearrangements. The intermittency of bubble rearrangements in the foam leads to effectively stochastic drops in stress that are followed by periods of elastic increase. We investigate global characteristics of highly disordered foams over three decades of strain rate and almost two decades of s...

Self-organized criticality in sheared suspensions.

Recent studies reveal that suspensions of neutrally buoyant non-brownian particles driven by slow periodic shear can undergo a dynamical phase transition between a fluctuating irreversible steady state and an absorbing reversible state. Using a computer model, we show that such systems exhibit self-organized criticality when a finite particle sedimentation velocity v(s) is introduced. Under per...

Reversibility and criticality in amorphous solids

The physical processes governing the onset of yield, where a material changes its shape permanently under external deformation, are not yet understood for amorphous solids that are intrinsically disordered. Here, using molecular dynamics simulations and mean-field theory, we show that at a critical strain amplitude the sizes of clusters of atoms undergoing cooperative rearrangements of displace...