Numerical Modelling of Crack Initiation, Propagation and Branching under Dynamic Loading

Abstract: In this paper crack initiation, propagation and branching phenomena are simulated using the Pseudo-Spring Smooth Particle Hydrodynamics (SPH) in two and three-dimensional domains. The pseudo-spring analogy is used to model material damage. Here, the interaction of particles is limited to its initial immediate neighbours. The particles are connected via springs. These springs do not provide any extra stiffness in the system but only define the level of interaction between the connecting pairs. It is assumed that a crack has passed through a spring connecting a particle pair if the damage indicator of that spring becomes more than a predefined value. The crack branching of a pre-notched plate under dynamic loading and the effect of loading amplitude are studied here. The computed crack speeds, crack paths and surfaces are compared with experimental and numerical results available in the literature and are found to be in good agreement. The effect of notch location for a plate with a circular hole is studied here. The ability of the framework to model arbitrary crack paths and surfaces are demonstrated via three-dimensional simulations of chalk under torsion, Kalthoff-Winkler experiment and Taylor bullet impact.