Expansion and fracture characteristics of oxygen-free copper tubes with different grain sizes under detonation loading

SHEN Fei; WANG Hui; QU Kepeng; ZHANG Gao

doi:10.11883/bzycj-2019-0063

Volume 40 Issue 2

Jan. 2020

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SHEN Fei, WANG Hui, QU Kepeng, ZHANG Gao. Expansion and fracture characteristics of oxygen-free copper tubes with different grain sizes under detonation loading[J]. Explosion And Shock Waves, 2020, 40(2): 022201. doi: 10.11883/bzycj-2019-0063

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SHEN Fei, WANG Hui, QU Kepeng, ZHANG Gao. Expansion and fracture characteristics of oxygen-free copper tubes with different grain sizes under detonation loading[J]. Explosion And Shock Waves, 2020, 40(2): 022201. doi: 10.11883/bzycj-2019-0063

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Expansion and fracture characteristics of oxygen-free copper tubes with different grain sizes under detonation loading

doi: 10.11883/bzycj-2019-0063

Xi’an Modern Chemistry Research Institute, Xi’an 710065, Shaanxi, China

Received Date: 2019-03-01
Rev Recd Date: 2019-09-17

Available Online: 2019-12-25

Publish Date: 2020-02-01

Abstract

Abstract

Two kinds of soft oxygen-free copper tubes with average grain size of 100−300 micron and 20−30 micron were used to fabricate standard copper tubes for $\varnothing$ 25 mm cylinder test. The differences of expansion displacement and specific kinetic energy curves of the two kinds of copper tubes under JO-159 loading were compared using high-speed scanning photography. The fracture process of the copper tube under JO-159 and TNT loading was obtained using framing photography, and the differences in fracture time, crack propagation direction and fragment shape were compared. The results show that under JO-159 loading, although the fine-grained copper tubes have good ductility, a small number of internal defects initiate obvious isolated growth holes, leading to slightly larger effective expansion displacement of copper tubes than that of the coarse-grained copper tubes, with a smaller relative deviation of the specific kinetic energy between the two kinds of copper tubes than 1%. There are many randomly-distributed holes when the coarse-grained copper tube is broken. With the increase of the explosive intensity, the number of holes increases. Cracks switch from longitudinal propagation mode into complex networked mode and fragments change from strip to fragmented shape. However, the fracture diameters under both conditions reach three times of the initial diameter, which meets the basic requirements of a cylinder test.
- oxygen-free copper tube,
- grain size,
- detonation loading,
- expansion,
- fracture

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References(18)

References

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