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| Theoretical and experimental studies on the phenomenon of reduction in penetration depth of hyper-velocity projectiles into granite |
| LI Gan1，2，SONG Chunming2，QIU Yanyu1，WANG Mingyang1，2 |
(1. Nanjing University of Science and Technology，School of Mechanical Engineering，Nanjing，Jiangsu 210094，China；
2. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China) |
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Abstract The penetrations of long-rod steel projectiles of high-strength at 1.2–2.4 km/s into granite targets using the two-stage light-gas gun of 100/30 mm are carried out to investigate the effect and mechanisms of penetration. The macro-damage of the targets and projectiles，the penetration depth and the mass of the recovered projectiles are obtained. The penetration depth increases firstly，then decreases sharply and finally increases gently as the increasing of striking velocity，which correspond to the rigid body penetration，semi-hydrodynamic penetration，and hydrodynamic penetration respectively. In the stage of semi-hydrodynamic penetration，the mass of the recovered projectiles decreases rapidly，while the projectile diameter changes slightly. A model for calculating the penetration depth taking account of the loss of projectile mass is presented. The calculated results fit the experiment data well. The influence of the loss of projectile mass on penetration is analyzed，and the internal mechanism of the reduction phenomena of penetration depth is revealed.
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2018, Vol. 37 
