Shearing a glass and the role of pinning delay in models of interface depinning.

摘要: When a disordered solid is sheared, yielding followed by the onset of intermittent response that characterized slip in local regions usually labeled shear-transformation zones. Such resembles behavior earthquakes or contact depinning, where well-defined landscape pinning disorder prohibits deformation an elastic medium. Nevertheless, evidently different barriers particles are due to neighbors also subject motion. Microscopic leads destruction microstructure and heating. It natural assume locally liquid emerges for finite timescale before cooling down transformed configuration. For including this characteristic transient glass depinning models, we propose general mechanism involves "pinning delay" time T(pd), during which each region slipped evolves as fluid. The new can be small single avalanche step. This local, effective, dynamical nature may thought softening. We demonstrate inclusion causes drift critical exponents toward higher values sizes τ, until transition permanent shear-banding happens causing almost oscillatory, stick-slip response. Moreover, it proliferation large events highly inhomogeneous resemble sharp band formation.