Numerical Simulation Of Failure Modes Of Concrete Under Dynamic Loading

Numerical simulation is independent of the experimental and theoretical analysis of a basic scientific method, which can be changed at test conditions on the basis of theoretical analysis in order to find a better parameter configuration, and its stability with non instantly in the explosion impact studies major role in the process of research methods can not be replaced. Therefore, numerical simulation is an effective way to study dynamics of cement mortar and concrete damage. Currently numerical simulation has formed a set of research system.In this paper, ANSYS/LS-DYNA software for the numerical simulation of the following conditions:①various sizes destruction process cement mortar specimens at different impact velocities;②different sizes of cement mortar destruction process at the same impact velocity;③each size the failure process of concrete specimens at different impact velocities; same⑤coarse aggregate content and impact velocity, aggregate gradation of different concrete specimens;④coarse aggregate concrete specimens with different content at the same failure process impact velocity dynamic destruction process. Analysis of cement mortar sample size, the impact on the dynamic mechanical properties of impact velocity cement mortar; and analysis of specimen size, impact velocity, coarse aggregate content and influence the distribution of the dynamic mechanical properties of concrete Numerical results show that:①HJC model can better reflect the impact of compression constitutive relation of cement mortar and concrete;②cement mortar specimens and peak stress concrete specimens were increases with increasing impact velocity is a kinds of rate-sensitive material;③at the same impact velocity, mortar and concrete specimens with increasing peak stress specimen specimen size were reduced, showing a significant size effect;④concrete specimens in the same bone aggregate size, the same impact velocity, peak stress of concrete specimens same size as a percentage of the increase in aggregate volume showed a tendency to increase;⑤concrete specimen damage is cracks began to appear from the lower corner of the specimen, the crack from the aggregate focus began to undermine the corner, and then the cracks began to move upwards from the lower end of the specimen, until through.This paper results of the verification test, based on the completion of the numerical implementation of concrete dynamic failure mode for future tests indicate and provide some guidance.