Ramp wave loading technique and application using a “bed of nails” flyer system

ZONG Ze; WANG Gang; FANG Jiacheng; LIN Xi; WANG Yonggang

doi:10.11883/bzycj-2020-0391

Volume 41 Issue 4

Apr. 2021

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ZONG Ze, WANG Gang, FANG Jiacheng, LIN Xi, WANG Yonggang. Ramp wave loading technique and application using a “bed of nails” flyer system[J]. Explosion And Shock Waves, 2021, 41(4): 041405. doi: 10.11883/bzycj-2020-0391

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ZONG Ze, WANG Gang, FANG Jiacheng, LIN Xi, WANG Yonggang. Ramp wave loading technique and application using a “bed of nails” flyer system[J]. Explosion And Shock Waves, 2021, 41(4): 041405. doi: 10.11883/bzycj-2020-0391

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Ramp wave loading technique and application using a “bed of nails” flyer system

doi: 10.11883/bzycj-2020-0391

Key Laboratory of Impact and Safety Engineering, Ministry of Education of China,Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 2020-10-15
Rev Recd Date: 2021-01-24

Available Online: 2021-04-14

Publish Date: 2021-04-14

Abstract

Abstract

In order to generate a ramp wave loading, a generalized wave impedance gradient (GWIG) flyer was designed by a solid disc as a base for arrays of cone spikes, termed the “bed of nails” flyer. The “bed of nails” flyer was fabricated by Selective Laser Metaling additive manufacturing. Using a single-stage light-gas gun and a displacement interferometer system for any reflector (DISAR), a series of plate impact and spallation experiments using “bed of nails” flyer impact were performed. The effects of the height of cone and impact velocity on the ramp wave loading profiles and the effects of ramp wave loading on spallation characteristics of stainless-steel target were discussed. The experimental results show that: (1) From the free surface velocity profiles measured by DISAR, it is observed that the rising edge time of the compression wave is significantly prolonged, and the ramp wave loading is formed, which is obviously different from the steep wave front of the usual shock compression; (2) When the impact velocity of the flyer is approximately constant, both the rising edge time and the peak velocity of the ramp wave loading obviously depend on the cone height of the“bed of nails” flyer, with the increase of the height of the small cone, the rising edge time increases linearly, while the peak velocity decreases linearly; (3) When the geometric size of the “bed of nails” flyer remains unchanged, with the increase of the flyer’s velocity, the rising edge time of the ramp wave loading decreases linearly, while the peak velocity increases linearly; (4) Comparing with shock wave loading, the ramp wave loading generated by the “bed of nails” flyer has no obvious effect on the spallation strength of the stainless-steel, but has an influence on the damage evolution rate.
- ramp wave loading,
- “bed of nails” flyer,
- additive manufacture technique,
- spallation

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References(30)

References

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