Dynamic response analysis of cellular projectile impacting foam sandwich beam

ZHANG Yuanrui; ZHU Yudong; WANG Kehong; ZHOU Qi; YU Jilin; ZHENG Zhijun

doi:10.11883/bzycj-2024-0045

Volume 44 Issue 9

Sep. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(9): 091442

ZHANG Yuanrui, ZHU Yudong, WANG Kehong, ZHOU Qi, YU Jilin, ZHENG Zhijun. Dynamic response analysis of cellular projectile impacting foam sandwich beam[J]. Explosion And Shock Waves, 2024, 44(9): 091442. doi: 10.11883/bzycj-2024-0045

Citation:

ZHANG Yuanrui, ZHU Yudong, WANG Kehong, ZHOU Qi, YU Jilin, ZHENG Zhijun. Dynamic response analysis of cellular projectile impacting foam sandwich beam[J]. Explosion And Shock Waves, 2024, 44(9): 091442. doi: 10.11883/bzycj-2024-0045

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Dynamic response analysis of cellular projectile impacting foam sandwich beam

doi: 10.11883/bzycj-2024-0045

1.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
3.
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, China

Received Date: 2024-01-29
Rev Recd Date: 2024-04-05

Available Online: 2024-04-07

Publish Date: 2024-09-20

Abstract

Abstract

Cellular projectiles are widely used in the impact tests of protective structures, but the actual loads of cellular projectiles acting on the tested sandwich structures are still unclear. To explore the coupling response process between the uniform/graded cellular projectile and the foam sandwich beam and the loading effect of cellular projectiles, theoretical analysis, numerical simulations, and impact tests were carried out. The foam sandwich beam was equivalent to a monolithic beam to simplify the analysis. Based on the shock wave model of the cellular projectile and the equivalent response model of the foam sandwich beam, a coupling analysis model of the cellular projectile impacting the foam sandwich beam was developed, and its governing equations were presented and solved numerically by the Runge-Kutta method. Meso-finite element simulations of a uniform/graded cellular projectile impacting a foam sandwich beam were carried out based on the 3D Voronoi technique. Impact tests were performed on the test platform of cellular projectiles, and the velocity response of the cellular projectiles and the foam sandwich beams was obtained by using a high-speed camera and a digital image processing technique. It is found that the coupling analysis model can accurately predict the velocity history curves of the cellular projectile and the foam sandwich beam, as well as the impact pressure of the cellular projectile. Subjected to cellular projectiles with the same initial momentum but different density distribution or initial velocity, foam sandwich beams with the same configuration present different mechanical response processes, which demonstrates that the impact of cellular projectiles cannot be simply equivalent to impulse loading, and the coupling effect between the projectile and the sandwich beam cannot be ignored. Compared with uniform cellular projectiles, the impact pressure waveform of the graded cellular projectile is sharper and shows stronger nonlinearity during its attenuation. This study clarifies the loading effect of cellular projectiles on foam sandwich beams and lays a theoretical foundation for the optimal design of cellular projectiles simulating blast loads.
- cellular projectile,
- foam sandwich beam,
- coupling analysis model,
- finite element simulation,
- impact test

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References

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