Numerical simulations of dynamic plastic shear instability under conditions of plane strain (Q1286208)

We present a numerical analysis for the edgewise propagation of plastic instability from the tip of a pre-existing semi-infinite notch in an otherwise unbounded continuum. The driving force for the shear deformation is provided by an in-plane shear loading pulse. Coupled thermo-mechanical simulations are carried out under fully plane strain conditions. The simulations take into account finite deformations, inertia, heat conduction, thermal softening, strain hardening and strain rate hardening. A combined power law-exponential relation that gives rise to enhanced strain-rate hardening and ultra-high strain rates is employed. In order to investigate the effects of material parameters on the initiation and progression of plastic instability, a series of numerical simulations are conducted by varying the material model parameters.