A new composite protective structure based on controllability of blast load on structure layer (I): blast resistance mechanism

FANG Qin; GAO Chu; KONG Xiangzhen; YANG Ya

doi:10.11883/bzycj-2023-0459

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FANG Qin, GAO Chu, KONG Xiangzhen, YANG Ya. A new composite protective structure based on controllability of blast load on structure layer (I): blast resistance mechanism[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0459

Citation:

FANG Qin, GAO Chu, KONG Xiangzhen, YANG Ya. A new composite protective structure based on controllability of blast load on structure layer (I): blast resistance mechanism[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0459

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A new composite protective structure based on controllability of blast load on structure layer (I): blast resistance mechanism

doi: 10.11883/bzycj-2023-0459

FANG Qin^1
,,
GAO Chu^{1, 2},
KONG Xiangzhen^{1
,
,},
YANG Ya¹

1.
State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
Inner Mongolia University of Finance and Economics, Hohhot 010070, Inner Mongolia, China

Received Date: 2023-12-23
Rev Recd Date: 2024-03-08

Available Online: 2024-03-12

Abstract

Abstract

The layered protective structure composed of bursting layer, distribution layer and structure layer is usually used to resist the penetration and blast waves induced by advanced earth penetrating weapons (EPWs). The defect of traditional layered protective structure with medium/coarse sand as the distribution layer is that it is difficult to reliably control the load on the structure layer. To solve this issue, an alternative approach is presented by replacing the material of distribution layer from the frequently-used medium/coarse sand to foam concrete. To investigate the blast resistance of layered protective structure sandwiched by foam concrete (named composite protective structure), the blast test on the layered composite target composed of CF120 concrete (a fiber reinforced high-strength concrete) bursting layer, C5 foam concrete distribution layer and C40 reinforced concrete structure layer was firstly conducted in the present study, in which the damage and failure in the layered composite target and blast waves at specific locations were the major concern and were accurately recorded. Then based on the concrete material model established by Kong and Fang and the Smoothed Particle Galerkin (SPG) algorithm available in the LS-DYNA, a corresponding numerical model was developed and validated against test data. Using the validated numerical model, the propagation and attenuation of blast waves and damage and failure in the composite protective structure induced by cylindrical charge explosion are discussed in detail. It is found that the blast resistance mechanism of the composite protective structure is attributed to the extreme wave impedance mismatch between the bursting layer and the foam concrete layer, which greatly reduces the propagation of blast waves into the foam concrete layer, leading to a transformation of more blast energy to the bursting layer, so that the blast load and energy on the structure layer can be greatly reduced. The research results can provide important reference for the design of protective structure against EPWs.
- Foam concrete,
- Composite protective structure,
- Blast load,
- Wave impedance,
- Kong-Fang material model

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References(27)

References

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