Simulation analysis of the effect of clearance on motion characteristic of metal flyer under detonation loading

LIU Jun; SUN Zhiyuan; ZHANG Fengguo; YIN Jianwei

doi:10.11883/bzycj-2022-0239

Volume 43 Issue 4

Apr. 2023

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LIU Jun, SUN Zhiyuan, ZHANG Fengguo, YIN Jianwei. Simulation analysis of the effect of clearance on motion characteristic of metal flyer under detonation loading[J]. Explosion And Shock Waves, 2023, 43(4): 042201. doi: 10.11883/bzycj-2022-0239

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Simulation analysis of the effect of clearance on motion characteristic of metal flyer under detonation loading

doi: 10.11883/bzycj-2022-0239

Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

Received Date: 2022-05-31
Rev Recd Date: 2022-08-25

Available Online: 2022-09-09

Publish Date: 2023-04-05

Abstract

Abstract

Clearance of certain thickness often exists between two stacked metal flyers. When a double-layer metal flyer with clearance is loaded by detonation, the closing of the clearance may affect the form and shock intensity of the first and second loading waves inside of the outer flyer, and then affects the free surface velocity of the outer flyer. In order to better grasp the motion characteristics under detonation loading, the effect of clearance on the dynamic process needs to be studied. Firstly, a detonation driven two-layer steel flyers model is presented, in which a clearance of certain thickness is assumed to exist between two steel flyers. In this model, the free surface of the outer flyer is loaded twice. By comparing the simulation results and experimental results of free surface velocity at different positions, it is confirmed that the simulation can correctly catch the dynamic process. Then, the sources of the first and second loading in the outer flyer are given by the analysis of the simulated dynamic process. The first loading wave in the outer flyer comes from the clearance closing collision, and the second loading wave mainly comes from the sustained high pressure loading of detonation products. Finally, the simulation with various clearance thicknesses is carried out, and the effect of clearance thickness change is summarized. The simulated results of free surface velocity show that with the increase of clearance thickness from 0.1 mm to more than 1 mm, the peak value of the first take-off free surface velocity first decreases and then remains unchanged, and the peak value of the second take-off free surface velocity first increases and then remains unchanged. The dynamic analysis shows that the size of the clearance thickness directly affects whether the inner steel flyer has enough time to develop into spallation on the clearance side after detonation loading. If the size of clearance is small, the inner flyer cannot develop into a spallation on clearance side, and the first loading wave formed in the outer flyer has a triangular like pulse. In this stage, with the increase of the clearance thickness, the first loading peak pressure decreases and the second loading peak pressure increases. If the size of clearance is large, the inner flyer can form a spallation with constant thickness and stable velocity on clearance side, and the first loading wave formed in the outer flyer is an approximate square wave. In this stage, with the increase of clearance thickness, the peak pressures of the first and second loading remain basically unchanged, but the time interval between the first and second loading decreases. The understanding has guiding significance for the interpretation of the free surface velocity measurement results in experiments, and some unexpected physical phenomena caused by clearance in practical problems could be better understood, too.
- detonation driving,
- metal flyer,
- clearance,
- second loading

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References(21)

References

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