Accelerated Numerical Simulation Method for Ultra-high Speed Deep Penetration of Projectile into Concrete Target

In order to explore the penetration law of large-sized projectile during ultra-high speed deep penetration into concrete, the experiments of ultra-high-speed penetration of 40 mm-diameter ogive-nose hollow projectiles into concrete targets are conducted with the effective impact velocity ranging from 1 466 to 1 877 m/s. The structural stability of the designed projectiles during ultra-high speed penetration is confirmed through experiment. The shapes of the targets and projectiles after experiments are obtained through 3 D scanning, and the ultra-high speed penetration results in a significant increase in the depth of penetration and the size of impact carter. Furthermore, a numerical simulation optimization acceleration method for ultra-high speed deep penetration of projectile into a segmented stacking concrete target is proposed to accelerate the solution of large-scale models in meso-scale simulations of ultra-high speed deep penetration. Compared to the traditional integrated modeling and solving method, the proposed optimization acceleration method balances the representational capacity and computational efficiency, and can achieve good representation of projectile erosion and ballistic deflection, which is consistent with theoretical and experimental results. Based on previous work, the whole process optimization from modeling to solving has solved the two main limitations of the time-consuming modeling of large-scale meso model and the inefficient solution of deep penetration simulation in the meso-scale simulation of ultra-high speed deep penetration, which has important engineering application significance and provides a foundation for exploring the meso-scale mechanism for ultra-high speed deep penetration.