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Experimental Study on the Ballistic Resistance of S-shaped CFRP Foldcore Sandwich Structure against Flat-Nosed Projectile Impacts

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Abstract

In order to study the high-velocity impact resistance of S-shaped carbon-fiber foldcore sandwich structure, the S-shaped carbon-fiber foldcore was prepared by molding method, and then the foldcore sandwich panel was formed by secondary bonding and curing. The projectiles with different velocities were launched to impact the node position and base position of the sandwich panel by using the one-stage air gun, and the influence of the projectile velocity and impact position on the impact resistance and damage modes of the structure was revealed. The experimental results show that the ballistic limit velocity of the node position is 11.6% higher than that of the base position. The reason is that the energy consumption of brittle crushing fracture failure in the core caused by in-plane impact load is higher than that of tensile fracture failure induced by out-of-plane impact load. Furthermore, with the increase of projectile impact velocity, the energy consumption of the sandwich panel increases, but the energy absorption rate decreases. The mass loss of the sandwich panel increases at first and then decreases, which is caused by the local destructive trend of the sandwich panel. As for the damage of the sandwich panel, the front panel fails by shear fracture, but it will collapse when the base impact is at a higher impact velocity. Under the node and base impact, the rear panel undergoes the transformation from zigzag tensile fracture, cross-shaped tensile fracture to overall tensile tearing failure with the increase of projectile velocity.

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Data Availability

The raw data used to support the findings of this study are available from the corresponding author upon request.

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Funding

Thanks to the National Natural Science Foundation of China Youth Project (No.: 11702317), the Aviation Science Foundation Project (No.: 2018ZF67011), and the Fundamental Research Funds for the Central Universities (No.:3122019076) for supporting the present work.

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Authors and Affiliations

  1. College of Aeronautical Engineering, Civil Aviation University of China, Dongli District, Tianjin, 300300, China

    Yunfei Deng, Nan Zhou, Huiru Jia & Huapeng Wu

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  1. Yunfei Deng
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  2. Nan Zhou
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  3. Huiru Jia
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  4. Huapeng Wu
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Correspondence to Nan Zhou.

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Deng, Y., Zhou, N., Jia, H. et al. Experimental Study on the Ballistic Resistance of S-shaped CFRP Foldcore Sandwich Structure against Flat-Nosed Projectile Impacts. Appl Compos Mater 29, 1275–1291 (2022). https://doi.org/10.1007/s10443-022-10020-9

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