Detonation gas model for combined finite-discrete element simulation of fracture and fragmentation

The equation of state For expansion of detonation gas together with a model for gas flow through fracturing solid is proposed and implemented into the combined finite-discrete element code. The equation of state proposed enab les gas pressure to be obtained in a closed form for both reversible and ir reversible adiabatic expansion, while the gas Row model proposed considers only 1D compressible flow through cracks, hence avoiding full 2D or 3D gas flow through the fracturing solid. When coupled with finite-discrete elemen t algorithms for solid fracture and fragmentation, the model proposed enabl es gas pressure to be predicted and energy balance to be preserved. Copyrig ht (C) 2000 John Wiley & Sons, Ltd.