Deformation and phase transformation of 20 steel cylinders driven by inner explosion

LI Manjiang; ZHAO Zhihao; DONG Xinlong; FU Yingqian; YU Xinlu; ZHOU Gangyi

doi:10.11883/bzycj-2022-0074

Volume 43 Issue 1

Jan. 2023

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LI Manjiang, ZHAO Zhihao, DONG Xinlong, FU Yingqian, YU Xinlu, ZHOU Gangyi. Deformation and phase transformation of 20 steel cylinders driven by inner explosion[J]. Explosion And Shock Waves, 2023, 43(1): 013105. doi: 10.11883/bzycj-2022-0074

Citation:

LI Manjiang, ZHAO Zhihao, DONG Xinlong, FU Yingqian, YU Xinlu, ZHOU Gangyi. Deformation and phase transformation of 20 steel cylinders driven by inner explosion[J]. Explosion And Shock Waves, 2023, 43(1): 013105. doi: 10.11883/bzycj-2022-0074

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Deformation and phase transformation of 20 steel cylinders driven by inner explosion

doi: 10.11883/bzycj-2022-0074

LI Manjiang^{1, 2
,},
ZHAO Zhihao^{1, 2},
DONG Xinlong^{1, 2
,
,},
FU Yingqian²,
YU Xinlu³,
ZHOU Gangyi¹

1.
Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
3.
College of Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, China

Received Date: 2022-03-01
Rev Recd Date: 2022-11-04

Available Online: 2022-12-01

Publish Date: 2023-01-05

Abstract

Abstract

Studying the microstructure evolution of metals subject to shock waves is significant for understanding the structural deformation and failure mechanism of such a pipe under a very high rate of loading. The microstructure evolution and phase transformation characteristics of the material under the action of shock wave are discussed through the microscopic analysis of the cross-section of explosive recovered fragments of 20 steel cylindrical shell driven by explosive expansion. The finite element method (FEM) also was used to simulate the explosion experiment of 20 steel cylindrical shell under the condition of PETN charge and to analyze the cylindrical shell’s thermodynamic characteristics during the expansion fracture process. The results show that the α-grans near the cylinder’s inner surface contain numerous slip lines, distributed in parallel. The FEM simulation indicates that these regions meet the α→ε phase transition thermo-dynamic condition. Furthermore, electron back scattered diffraction (EBSD) analysis of the microstructure of the regions with parallel slips line demonstrates the formation of a strongly fragmented. And there are {332}<113> twins and {112}<111> twins. At the same time, the ε phase structure of the hexagonal close-packed lattice (HCP) exists in the fragmented structure area of the parallel slip line. However, there was no residual ε phase structure in the original structure of the sample and the area except for the sample wall thickness (inner 0–3.0 mm) after the explosion. Analysis deems in which the α→ε→α transformation occurred. The change of material properties caused by phase transformation may affect the cylindrical shell's internal stress and strain state and the fracture process. Considering the impact of the dynamic phase transition of metal materials on the deformation and failure of structures under shock waves, it is significant to accurately simulate the deformation and failure of such cylindrical shells, and it is necessary to further study the influence of phase transformation.
- 20 steel cylinder,
- explosively expanding,
- microscopic analysis,
- phase transformation

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References(52)

References

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