Numerical simulation of mechanical behaviour of concrete under shock wave loading

Abstract

In this paper results of numerical simulation of the mechanical behaviour of heavy concrete under preliminary compression and shock wave loading with intensity up to 1.2 GPa are submitted. The model specimen of concrete consisted of cement paste and granite filler with volumetric concentration above 65%. Mechanical behaviour of the representative volume of concrete was described by the model of the heterogeneous medium with stochastic distribution of filler particles. It was supposed that cement matrix can be considered as elastic-plastic material and granite of inclusions is a brittle material. The yield limit of cement paste was accepted to be 0.08 GPa, and the strength limit of granite equals 0.1 GPa. The absence of macroscopic and mesoscopic voids and cracks in the material was assumed. Ideal adhesion of filler material and matrix was supposed at the initial condition. Results of numerical simulation of the mechanical behaviour of concrete under shock loading have shown the formation of non-stationary and essentially non-uniform fields of deformations. The generation of a dissipative structure on the meso-scale level of the concrete under reshock wave loading was revealed in the simulation.