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Chinese Journal of Materials Research  2020, Vol. 34 Issue (4): 241-246    DOI: 10.11901/1005.3093.2019.177
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Effect of Shell Thickness on Expanding Fracture Behavior of HR2 Steel Cylinders under Explosive Loading
LU Qiuhong1(), WANG Ning2, FAN Cheng3, SHEN Yongfeng2, LIU Mingtao3, TANG Tiegang3, HU Haibo3
1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
3.Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Cite this article: 

LU Qiuhong, WANG Ning, FAN Cheng, SHEN Yongfeng, LIU Mingtao, TANG Tiegang, HU Haibo. Effect of Shell Thickness on Expanding Fracture Behavior of HR2 Steel Cylinders under Explosive Loading. Chinese Journal of Materials Research, 2020, 34(4): 241-246.

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Abstract  

To clarify the fracture mechanism of metal cylinder under explosive loading, HR2 steel cylinders with shell of 6 and 12 mm in thickness respectively were subjected to explosive loading. The fracture fragments were collected after explosion, and then systematically investigated in terms of macroscopic morphology, fracture morphology and deformation microstructure. It is found that when the shell thickness increases, the fracture mode of HR2 cylinder changed from shearing fracture to the mixture of shearing fracture and tensile fracture. The deformation microstructure observation indicates that the failure and fracture of cylinder shell are the result of the combination and competition of cracks-nucleating and -expanding from the shear band and from the outer surface. The fracture of thin cylinder is dominant by the cracks nucleating and expanding from the shear band, presenting shearing fracture mode. The fracture of thick cylinder is the combined action of cracks-nucleating and -expanding from the shear band and from the outer surface, presenting a mode of mixture of shear- and tensile-fracture.
Key words:  metallic materials      HR2 steel      explosive loading      expanding fracture      microstructure      shear bands      fracture mechanism     
Received:  28 March 2019     
ZTFLH:  TG142  
Fund: National Nature Science Foundtion of China(No. U1530146);National Nature Science Foundtion of China(No. 11602249);National Nature Science Foundtion of China(No. U1730140)
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Articles by authors
Qiuhong LU
Ning WANG
Cheng FAN
Yongfeng SHEN
Mingtao LIU
Tiegang TANG
Haibo HU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.177     OR     https://www.cjmr.org/EN/Y2020/V34/I4/241

CSiMnPSNiCrN
<0.04<1.008.00~10.00<0.025<0.0155.50~8.0019.00~21.500.20~0.34
Table 1  Chemical compositions of HR2 steel (mass fraction, %)
Fig.1  Microstructure in the internal (a) and near the outer surface (b) of as-annealed HR2 steel cylinder
Fig.2  Schematic diagram of explosive device
Fig.3  Macroscopic morphology (a), (d), fracture morphology (b), (e) of fracture fragments and the schematic diagram of fracture mode (c), (f) in thin-walled and thick-walled HR2 steel cylinder respectively
Fig.4  Cross sectional observation of microscopic morphology inside the HR2 steel cylinder (a), near the outer surface (b) of thin-wall shell fragments and near the outer surface of thick-walled cylinder fragments after exploding
Fig.5  Cross-section TEM images of nanoscaled twins (a), coarse twins (b) and dislocation structures (c) in the thin-walled HR2 steel cylinder after exploding
Fig.6  Hardness variation of the fracture fragments along radial direction
Fig.7  The schematic diagram of compressive stress and tensile stress in an expansion cylinder
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