Numerical Simulation Study of Rigid Projectile Impacts the Concrete at Low Speed

In the past hundred years, many scholars at home and abroad have put forward many empirical formulas that can be used to calculate the depth of the high-speed concrete penetration process. However, these formulas are not suitable for the calculation of low-speed penetration depth. In this paper, a formula is proposed that can be applied to calculate the depth of low-speed penetration process. The finite element model that a rigid projectile impacts the concrete target at a low speed is established by ABAQUS software. The validity of the formula is verified by changing the parameters such as impact velocity and projectile mass. The simulation results show that when the rigid projectile impacts the concrete at a low speed, the formula proposed in this paper can well reflect the variation law of penetration depth with impact velocity and projectile mass. And the calculated error is within 10% after formula correction. In addition, different from the traditional one-time high-speed penetration mode, this paper proposes a multiple low-speed penetration mode. The simulation results show that the depth of multiple low-speed penetration mode can be increased than the one-time high-speed penetration with the same energy input.