Key physical problems in the expanding fracture of explosively driven metallic shells

LIU Mingtao; TANG Tiegang

doi:10.11883/bzycj-2020-0351

Volume 41 Issue 1

Jan. 2021

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LIU Mingtao, TANG Tiegang. Key physical problems in the expanding fracture of explosively driven metallic shells[J]. Explosion And Shock Waves, 2021, 41(1): 011402. doi: 10.11883/bzycj-2020-0351

Citation:

LIU Mingtao, TANG Tiegang. Key physical problems in the expanding fracture of explosively driven metallic shells[J]. Explosion And Shock Waves, 2021, 41(1): 011402. doi: 10.11883/bzycj-2020-0351

LIU Mingtao, TANG Tiegang. Key physical problems in the expanding fracture of explosively driven metallic shells[J]. Explosion And Shock Waves, 2021, 41(1): 011402. doi: 10.11883/bzycj-2020-0351

Citation:

LIU Mingtao, TANG Tiegang. Key physical problems in the expanding fracture of explosively driven metallic shells[J]. Explosion And Shock Waves, 2021, 41(1): 011402. doi: 10.11883/bzycj-2020-0351

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Key physical problems in the expanding fracture of explosively driven metallic shells

doi: 10.11883/bzycj-2020-0351

LIU Mingtao,
TANG Tiegang^,

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

Received Date: 2020-09-24
Rev Recd Date: 2020-11-22
Publish Date: 2021-01-05

Abstract

Abstract

The expansion fracture process of metallic shells under explosive loading is an important topic in fields of weapon design. This process contains a wealth of basic science problems in materials science and mechanics, which has attracted the long-term attention of many scholars. Based on the analysis of the expansion fracture behavior of metal shells under explosive loading, three key physical problems were clarified: dynamic tensile constitutive law of metals, expansion fracture mechanism of shells and mechanism of fragment size. The current status and research trends of the three physical problems were comprehensively analyzed. For the aspect of dynamic tensile constitutive law of metals, it is need to develop some new experimental methods to stretch the material at higher strain rates, to develop the experimental techniques of expanding cylindrical and spherical shells for studying the dynamic tensile constitutive relationship of materials under three dimentional stress state, and to develop the transient acceleration measurement technique and the interpretation method of expansion ring experimental data. For the expansion fracture mechanism, the main development trends are to develop the in-situ or freezing diagnostic techniques to capture key parameters in the fracture process of shells, to use the statistical method to study the fracture behavior, to reveal the essential mechanism of the fracture mode transition and the Ivanov plastic peak phenomena, and to study the mechanism of expanding fracture shells at the micro level. For the mechanism of fragment size, it is need to study the relationship between the fragment size and all the potential control variables with the experimental and modeling method, to analyze the relationship between the micro heterogeneity of the material and the statistical distribution of the fragment size by taking the probability distribution of fracture strain as a bridge, and to analyze the influence of two-dimensional or three-dimensional effects on fragment size distribution and develop new models.
- shell expansion fracture,
- dynamic tensile constitutive law,
- fracture mechanism,
- fragment size

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References(68)

References

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