Abstract
When the projectile penetrates into the sand at high velocity, meandering of the projectile and crushing of particles have been observed experimentally. However, the details of how these phenomena occur have not been clarified. It is difficult to investigate the behaviors of the projectile and sand particles inside target material, on the other hand, it is possible to visualize above behaviors by numerical analysis. In the present study, we performed numerical analysis of high-velocity penetration of the projectile into sand to compare with experimental results. In numerical analysis, we have constructed a new equation of state (EOS) to assess the propagation velocity of pressure wave accurately during high-velocity impacts into sand. Our new EOS redefined the compressive process non-linearly, and simulated measurement results better than conventional compaction models described linearly. We compared the propagation velocities of pressure wave obtained by numerical analysis using the new model and the conventional model. As a result, numerical results using the new model described the propagation velocity of pressure wave more closely to measurement values.
