Numerical Simulation of Al Sphere Fragmentation under High-Velocity Normal Impacting Aluminum Mesh Bumper

Numerical simulation of aluminum sphere projectile high-velocity impacting aluminum mesh bumper was conducted with Smoothed Particle Hydrodynamics (SPH) arithmetic of LS-DYNA. The relationship between the debris clouds characteristic of projectile and the impact position on aluminum mesh bumper was studied. The effect on fragmentation of projectile from different combination mode of aluminum mesh bumper was analyzed. The results indicated that the debris clouds configuration from aluminum sphere projectile impacting aluminum mesh bumper was different with the different impact position on aluminum mesh bumper. The debris clouds as palpus was found in the front of projectile debris clouds. Some local kinetic energy concentrated appeared in the debris clouds. When a wire across point position was impacted, projectile debris clouds expand to form film configuration, and debris clouds distribution was more uniform. When aluminum mesh bumper was combined with interleaving mode, projectile debris clouds had more diffuse area and less residual kinetic energy. Aluminum mesh bumper combined with interleaving mode was helpful in enhancing the protection performance of shields.