Quasi-isentropic compression technique based on generalized wave impedance gradient flyer

CHEN Zibo; XIE Puchu; LIU Dongsheng; CHEN Wei; WANG Yonggang

doi:10.11883/bzycj-2018-0407

Volume 39 Issue 4

Mar. 2019

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CHEN Zibo, XIE Puchu, LIU Dongsheng, CHEN Wei, WANG Yonggang. Quasi-isentropic compression technique based on generalized wave impedance gradient flyer[J]. Explosion And Shock Waves, 2019, 39(4): 041406. doi: 10.11883/bzycj-2018-0407

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Quasi-isentropic compression technique based on generalized wave impedance gradient flyer

doi: 10.11883/bzycj-2018-0407

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

Received Date: 2018-10-19
Rev Recd Date: 2018-12-27

Available Online: 2019-04-25

Publish Date: 2019-04-01

Abstract

Abstract

Based on the wave propagation characteristics of variable cross-section rods, a generalized wave impedance gradient flyer, termed the " bed of nails” was designed. The process of the generalized wave impedance gradient flyer impacting the sample was simulated by using the SPH algorithm of the LS-DYNA software. The wave profiles display a smooth increase of velocity, with no indication of a shock jump. The physical mechanism of the quasi-isentropic compression generation is attributed to the interaction from a series of approximately spherical waves with slowly rising front. The influences of impact velocity and geometric parameters of the flyer on the ramp wave loading characteristics were discussed in detail, which provide some useful information for the design and application of the generalized wave impedance gradient flyer. Selective Laser Melting, and an additive manufacture technique, were used to manufacture the " bed of nails” flyer. The experiments were performed at the impact velocities of 348 m/s using the 57 mm gas gun. The measured free surface velocity profile agrees well with the simulation results.
- generalized wave impedance gradient flyer,
- quasi-isentropic compression,
- SPH,
- additive manufacture technique

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References(14)

References

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