Application of plastic-damage material model for foam concrete in composite protective structure

SHI Shufeng; KONG Xiangzhen; FANG Qin; YANG Ya; GAO Chu

doi:10.11883/bzycj-2023-0166

Volume 44 Issue 2

Feb. 2024

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SHI Shufeng, KONG Xiangzhen, FANG Qin, YANG Ya, GAO Chu. Application of plastic-damage material model for foam concrete in composite protective structure[J]. Explosion And Shock Waves, 2024, 44(2): 025101. doi: 10.11883/bzycj-2023-0166

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SHI Shufeng, KONG Xiangzhen, FANG Qin, YANG Ya, GAO Chu. Application of plastic-damage material model for foam concrete in composite protective structure[J]. Explosion And Shock Waves, 2024, 44(2): 025101. doi: 10.11883/bzycj-2023-0166

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Application of plastic-damage material model for foam concrete in composite protective structure

doi: 10.11883/bzycj-2023-0166

State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Received Date: 2023-05-03
Rev Recd Date: 2023-08-21

Available Online: 2023-12-13

Publish Date: 2024-02-06

Abstract

Abstract

An appropriate material model can accurately predict the mechanical behavior and damage mode of foam concrete subjected to blast loadings, and it has great significance on the design of composite protective structure. The purpose of this paper is to apply the new dynamic plastic-damage model for foam concrete presented by author to protective structures. Firstly, the new foam concrete model was briefly introduced. The model includes the definition of plasticity by introducing a yield function, flow rule and hardening law, the introduction of strain-rate effect and the definition of damage using plastic strain or related quantities. Subsequently, in order to validate the new model, the blast tests on the composite protective structure sandwiched by foam concrete with different strength were conducted and the stress waves at specific location and damage in foam concrete were recorded. Furthermore, the numerical results predicted by the new foam concrete model were compared to those predicted by the Soil and Foam model in the LS-DYNA. Finally, blast response of composite protective structure sandwiched by gradient foam concrete was numerically investigated based on the validated numerical model. The influences of arrangement and layers in gradient foam concrete layer on the anti-blast capability of composite protective structure were discussed by various working conditions. The results indicate that the numerical predictions excellently agreed with corresponding test data, demonstrating the accuracy of material model for foam concrete under blast loadings. Compared with the Soil and Foam model, the new model predicted better in terms of amplitude and duration of load on the structural layer, as well as the damage and failure in foam concrete layer. The gradient foam concrete numerical result showed that the arrangement and layers of foam concrete with different strength had an effect on the stress duration acting on the structure layer and the damage of the distribution layer. The new dynamic plastic-damage model for foam concrete has a broad application prospect in the research of protective structures
- foam concrete,
- plastic-damage model,
- composite protective structure,
- gradient distribution layer

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