Dynamic shear band propagation and micro-structure of adiabatic shear band

摘要

Meshfree Galerkin approximations in both two and three dimensions have been used in simulations of dynamic shear band propagation in an asymmetrically impact -loaded prenotched plate. Failure mode switching and failure mode transitions, which have been reported experimentally, are replicated in numerical computations. For intermediate impact speed (25 m/s＜V≤30 m/s), the numerical results show that a cleavage crack initiates form the tip of the dynamic shear band, indicating a dominance of brittle failure mode, and a failure mode switch (ductile-to-brittle: shearband-to-crack).