Experimental investigation into performances of an active Whipple shield against hypervelocity impact

WU Qiang; ZHANG Qingming; GONG Zizheng; REN Siyuan; LIU Hai

doi:10.11883/bzycj-2020-0266

Volume 41 Issue 2

Feb. 2021

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WU Qiang, ZHANG Qingming, GONG Zizheng, REN Siyuan, LIU Hai. Experimental investigation into performances of an active Whipple shield against hypervelocity impact[J]. Explosion And Shock Waves, 2021, 41(2): 021406. doi: 10.11883/bzycj-2020-0266

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WU Qiang, ZHANG Qingming, GONG Zizheng, REN Siyuan, LIU Hai. Experimental investigation into performances of an active Whipple shield against hypervelocity impact[J]. Explosion And Shock Waves, 2021, 41(2): 021406. doi: 10.11883/bzycj-2020-0266

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Experimental investigation into performances of an active Whipple shield against hypervelocity impact

doi: 10.11883/bzycj-2020-0266

1.
Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
3.
Hypervelocity Aerodynamic Institute, China Aerodynamic Research and Development Center, Mianyang 621000, Sichuan, China

Received Date: 2020-08-04
Rev Recd Date: 2020-10-21

Available Online: 2021-02-02

Publish Date: 2021-02-05

Abstract

Abstract

With the continuous increase of centimeter-scale space debris, the exploration and design of new high-performance shields has become an urgent need. Based on the shield of active materials, the hypervelocity impact experiments with different projectile sizes and impact velocities were carried out by using a two-stage light gas gun. The image characteristics of debris clouds under different impact conditions were obtained and analyzed by laser shadowgraph photography. The damage characteristics of the rear wall of the active Whipple shield were studied. Through the statistical analysis of the number of craters, the influences of active materials on the fragmentation of projectiles under different impact velocities were obtained. Compared with the classical Christiansen ballistic limit equation, the protective performance of energetic active material shield was obtained, and the ballistic limit curve of the new shield was fitted. Analysis suggests that shock initiation characteristics of active materials under impact enhanced the shield performance. When impacted by the space debris, active material shield firstly uses its mechanical strength for primary crushing. During this process, the energetic material shield has an explosive reaction with an instantaneous temperature being as high as 3 800 K, which can promote fragmentation, melting and reduce the size of the space debris. At the same time, the explosion products with high temperature, pressure and high speed motion produce a negative acceleration to the projectile fragments, reducing the axial kinetic energy. The explosion products of the active materials are mostly gaseous, which greatly reduce the number of the fragments with penetration ability in the debris cloud. The penetration failure of the rear plate only comes from the fragments generated by the fragmentation of the projectile. Under the combined action of impact and explosion, the active materials shield can not only fully break and decelerate space debris, but also greatly reduce the number of solid debris in debris cloud, thereby produce a sharp rise in the spacecraft protection ability, and the maximum protection ability can be increased by 45% when the velocity is 2.31 km/s.
- Whipple shield,
- hypervelocity impact,
- active materials,
- damage characteristics,
- ballistic limit

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References

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