Expanding Fracture Behavior of Single- and Double-Layered Metallic Cylindrical Shells Subjected to the Detonation of Hollow Explosives

ZHANG Shiwen; CHEN Yan; JIN Shan; DAN Jiakun; LIU Mingtao; TANG Tiegang

doi:10.11883/bzycj-2025-0177

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ZHANG Shiwen, CHEN Yan, JIN Shan, DAN Jiakun, LIU Mingtao, TANG Tiegang. Expanding Fracture Behavior of Single- and Double-Layered Metallic Cylindrical Shells Subjected to the Detonation of Hollow Explosives[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0177

Citation:

ZHANG Shiwen, CHEN Yan, JIN Shan, DAN Jiakun, LIU Mingtao, TANG Tiegang. Expanding Fracture Behavior of Single- and Double-Layered Metallic Cylindrical Shells Subjected to the Detonation of Hollow Explosives[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0177

Citation:

ZHANG Shiwen, CHEN Yan, JIN Shan, DAN Jiakun, LIU Mingtao, TANG Tiegang. Expanding Fracture Behavior of Single- and Double-Layered Metallic Cylindrical Shells Subjected to the Detonation of Hollow Explosives[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2025-0177

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Expanding Fracture Behavior of Single- and Double-Layered Metallic Cylindrical Shells Subjected to the Detonation of Hollow Explosives

doi: 10.11883/bzycj-2025-0177

ZHANG Shiwen^1
,,
CHEN Yan^{1
,
,},
JIN Shan¹,
DAN Jiakun^{1
,
,},
LIU Mingtao¹,
TANG Tiegang¹

1.
Institute of Fluid Physics, CAEP , Mianyang, Sichuan, 621999, China

Received Date: 2025-06-16
Rev Recd Date: 2026-04-09

Available Online: 2026-04-20

Abstract

Abstract

The detonation-driven expansion and fracture behavior of single-layered and double-layered metallic cylindrical shells (with equal total thickness) were investigated via the DPS (Doppler pins system) array and high-speed photography. The velocity curves and high-speed photography images of the outer surface of the single- and double-layered cylindrical shells were obtained. The velocity curves show that spallation occurs at approximately 40% of the thickness from the outer surface in the single-layered cylindrical shell. In addition, the spallation part was caught up after ~1.89 μs by the fragments of the single-layered cylindrical shell, leading to the secondary impact loading. In the case of double-layered cylindrical shell, the inner and outer shells of the double-layered cylindrical shell separated quickly since they cannot withstand the tensile stress. The outer cylindrical shell expands freely with high velocity at initial stage. It is then caught up by the inner cylindrical shell after 26.13μs, leading to the secondary impact loading. There is a significant difference in secondary impact loading times the single- and double-layered shell expansion experiments. The premature separation of the double-layered cylindrical shell hinders the crack penetration from the inside to the outside, and delays the crack penetration until the complete fracture of the whole cylindrical shell. In contrast to the widely investigated fracture behavior in a single-layered cylindrical shell, the detonation product leakage time is delayed when the outer layer of the double-layered cylindrical shell expands. The fragment size of a double-layered shell is obviously smaller than that of a single-layered shell. The distribution of the overflowing detonation product is relatively scattered and rare, and the overall crack of the outer cylindrical shell is clearly visible. The results of SPH (smoothed particle hydrodynamics) numerical simulations demonstrate that under certain conditions, the lower the spallation strength in single-layer cylindrical shells, the later the residual fragments catch up with the spalled layer during secondary loading, the less likely the occurrence of penetration fracture. Meanwhile, the interfacial gaps in double-layered cylindrical shells significantly inhibit the penetration and propagation of cracks.
- Impact dynamics,
- DPS array,
- High-speed photography,
- Expansion fracture,
- Double-layered shell,
- SPH

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References(22)

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