Modeling these brittle materials impact experiments is a challenging problem because of the complexity of the involved physics and the high computational cost usually associated with them. Under extreme loading conditions, brittle materials fail suddenly through dynamic fracturing processes. These failure mechanisms are typically a result of nucleation, interaction and coalescence of micro-cracks present throughout the sample. In this study, the Finite-Discrete Element Method (FDEM), which merges the finite element-based analysis of continua with discrete element based transient dynamics, contact detection, and contact interaction solutions, is used to simulate the response of a flyer-plate impact experiment in a Westerly granite sample that contains a randomized set of cracks. FDEM has demonstrated to be a strongly improved physical model as it can accurately reproduce the Velocity Interferometer System for Any Reflector (VISAR) plots and capture the spall region and spall strength obtained from the flyer plate experiment under different impact velocities.

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