A Peridynamics-SPH modeling and simulation of blast fragmentation of soil under buried explosive loads

Abstract

In this work, we report a computational study on Peridynamics modeling and simulation of soil fragmentation under buried explosive loads. We have implemented several geomaterial models of soil in the state-based Peridynamics formulation, which can take into account of the effects of strain softening, viscoplasticity, and porosity of soil. Moreover, we adopted a particle decohesion algorithm in the state-based Peridynamics for finite deformation to simulate soil fragmentation. A key technical ingredient of the simulation is the coupling between soil and explosive modeling methods, which is accomplished by coupling the state-based Peridynamics (soil) model with a modified smooth particle hydrodynamics (SPH) model (explosive). The modified SPH formulation used here is a non-local consistent particle dynamics that is formulated in the current (spatial) configuration.Numerical results of the simulations are compared with the measured experimental data. It has been found that there is a general agreement between the simulation results and the experimental data, and the computational model developed here has shown certain predictive capacity.