Numerical simulation on ground shock waves induced by hypervelocity penetration of a projectile into a limestone target

ZHANG Shanbao; KONG Xiangzhen; FANG Qin; HONG Jian

doi:10.11883/bzycj-2021-0007

Volume 42 Issue 1

Jan. 2022

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ZHANG Shanbao, KONG Xiangzhen, FANG Qin, HONG Jian. Numerical simulation on ground shock waves induced by hypervelocity penetration of a projectile into a limestone target[J]. Explosion And Shock Waves, 2022, 42(1): 013302. doi: 10.11883/bzycj-2021-0007

Citation:

ZHANG Shanbao, KONG Xiangzhen, FANG Qin, HONG Jian. Numerical simulation on ground shock waves induced by hypervelocity penetration of a projectile into a limestone target[J]. Explosion And Shock Waves, 2022, 42(1): 013302. doi: 10.11883/bzycj-2021-0007

Citation:

ZHANG Shanbao, KONG Xiangzhen, FANG Qin, HONG Jian. Numerical simulation on ground shock waves induced by hypervelocity penetration of a projectile into a limestone target[J]. Explosion And Shock Waves, 2022, 42(1): 013302. doi: 10.11883/bzycj-2021-0007

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Numerical simulation on ground shock waves induced by hypervelocity penetration of a projectile into a limestone target

doi: 10.11883/bzycj-2021-0007

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Engineering Research Center for Safety and Protection of Explosion and Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

Received Date: 2021-01-06
Accepted Date: 2021-11-22
Rev Recd Date: 2021-03-08

Available Online: 2021-12-06

Publish Date: 2022-01-20

Abstract

Abstract

With the advancement of hypervelocity weapons such as the “Rods-from-God”, the damage and failure in targets induced by the hypervelocity penetrators have been a topic of current research, which is still not fully understood. To address this issue, numerical investigation was carried out on ground shock induced by hypervelocity penetration of projectiles into limestone targets. As the material model and corresponding parameters are crucial for the accurate numerical predictions, the parameters for the p-α equation of state and the Kong-Fang material model recently proposed to describe the limestone were firstly calibrated based on a large amount of dynamic tests. The smooth particle hydrodynamics (SPH) method was employed for simulating the target and the axisymmetric numerical model was used to improve the computational efficiency. The calibrated parameters and numerical algorithm were validated by numerically simulating a series of penetration tests on limestone targets with a broad range of striking velocities. Then, based on the validated numerical model, the penetration of long-rod tungsten projectile into a limestone target was simulated and the mechanism of the corresponding ground shock was discussed. It was found that a high pressure in the target was induced by the hypervelocity impact of the projectile, which then propagated into the target as a stress wave, leading to the damage and failure in the target. The induced ground shock wave increased with the increase of the initial projectile velocity, especially when the initial projectile velocity is over 3.0 km/s. Finally, parametric study was conducted to investigate the effects of the parameters related to the projectiles and targets on the ground shock wave. The parameters related to the projectiles, for example, the length-to-diameter ratio and density, which can influence on the damage area of the targets by influencing the depth of penetration, has limited influence on the ground shock wave from the view of the relative depth (the ratio of the depth to the penetration depth). While the target parameters, especially the porosity which can affect the wave propagation, have a great effect on the ground shock wave.
- hypervelocity penetration,
- ground shock wave,
- limestone,
- material model

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References(35)

References

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