Influence of a cushion on dynamic expansion and fracture of an explosively-driven metallic cylinder

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

doi:10.11883/bzycj-2021-0456

Volume 42 Issue 8

Sep. 2022

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ZHANG Shiwen, JIN Shan, CHEN Yan, GUO Zhaoliang, DAN Jiakun, LIU Mingtao, TANG Tiegang. Influence of a cushion on dynamic expansion and fracture of an explosively-driven metallic cylinder[J]. Explosion And Shock Waves, 2022, 42(8): 083102. doi: 10.11883/bzycj-2021-0456

Citation:

ZHANG Shiwen, JIN Shan, CHEN Yan, GUO Zhaoliang, DAN Jiakun, LIU Mingtao, TANG Tiegang. Influence of a cushion on dynamic expansion and fracture of an explosively-driven metallic cylinder[J]. Explosion And Shock Waves, 2022, 42(8): 083102. doi: 10.11883/bzycj-2021-0456

Citation:

ZHANG Shiwen, JIN Shan, CHEN Yan, GUO Zhaoliang, DAN Jiakun, LIU Mingtao, TANG Tiegang. Influence of a cushion on dynamic expansion and fracture of an explosively-driven metallic cylinder[J]. Explosion And Shock Waves, 2022, 42(8): 083102. doi: 10.11883/bzycj-2021-0456

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Influence of a cushion on dynamic expansion and fracture of an explosively-driven metallic cylinder

doi: 10.11883/bzycj-2021-0456

Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2021-11-04
Rev Recd Date: 2022-03-15

Available Online: 2022-03-29

Publish Date: 2022-09-09

Abstract

Abstract

The influence of assembly cushions on the fracture of an expanding metal cylindrical shell was studied. The velocity of the outer surface of the shell with or without a cushion in it was measured by a Doppler pins system (DPS) array, and images with the obvious influence of an inner cushion on the fracture of the shell were recorded by the high-speed photography. Compared with the area without the cushion, the outer surface of the cylindrical shell in the cushion area experienced a process of first convex and then concave movement, which made the radial displacement of the surface repeatedly misplace, leading to a final displacement of 0.34 mm lower. This displacement difference may lead to the radial shear fracture of the cylindrical shell. Besides, in the experiment, a crack appeared on both sides of the cushion/gap interface (7.5° deviation on the cushion side and 9° deviation on the gap side). These cracks were resulted from the disturbance of two sparse stress waves, which were generated from the cushion/gap interface and then transmitted to the outer surface of the cylindrical shell. The fracture mode is different from both circumferential tensile fracture and shear fracture along 45° direction. This new fracture mode is closely related to the dynamic mechanical properties of the cylindrical shell’s material. Further numerical simulation analysis shows that the influence of the assembly cushion on the fracture mechanism of the cylindrical shell includes three aspects: firstly, the additional mass effect; secondly, the amplitude change of the explosive impact loading after it passing through the cushion, and the asynchronous difference of the impact loading sequence with other parts; and thirdly, the influence of the propagation of surface waves, which originate from the interface between the cushion and the gap, on the subsequent development behavior of the cylindrical fracture mode .
- expansion,
- fracture,
- DPS array,
- high-speed photography,
- cushion,
- metallic cylinder

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References(15)

References

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