Numerical Simulation Studies on Strain Rate Effect of Sandstone's Energy Dissipation and Destruction under Impulse Loading

Based on HJC dynamic constitutive model,the parameters were defined according to sandstone's basic mechanical parameters and the numerical simulation study on rock SHPB experiment was performed with software ANSYS /LS-DYNA.The numerical simulations result shows the damage increased with the strain rate,and the sandstone's failure mode was main tension failure,which fitted experiment result well.With the expanding process from edge to internal,the failure developed fast under high strain rate.Based on the energy dissipation characters through the failure process,the energy dissipation increased linearly with the increase of strain rate.The numerical result fitted the experiment well and helped to study the energy dissipation characteristics and rock mechanical properties under high strain rate.