Modelling blast wave propagation and failure in concrete induced by internal charge explosion by coupled peridynamics and smoothed particle hydrodynamics

Abstract

A coupled non-ordinary state-based peridynamics (NOSB-PD) and smooth particle hydrodynamics (SPH) model is proposed to perform high-fidelity physical based simulation on blast wave propagation and failure in concrete induced by internal charge explosion. To this end, the NOSB-PD framework with implementation of the Kong-Fang model is employed to model concrete solid due to its capability to handle natural discontinuity of complex failure. The SPH theory with four improvements of the delta-SPH method, the particle shifting technique, Monaghan artificial term and three-dimensional particle splitting technique is used to model explosive due to its capability to deal with the hydrodynamic problems. And their physical interactions are modelled by the PD-SPH coupling method based on ghost particles and repulsive forces. After numerical implementation using explicit time integration, the proposed coupled NOSB-PD and SPH model is employed to numerically predict two sets of internal spherical and cylindrical charge explosion tests in normal-strength and high-strength concrete targets. Based on the discretization determined by convergence study, numerical predictions are found to show good agreements with corresponding test data in terms of the blast wave propagation and failure in the concrete targets.