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| Theoretical analysis model for the anti flat-nosed projectile impact on aluminum foam sandwich structures#br# |
| FANG Zhiwei1,2，HOU Hailiang1，LI Mao1，LI Dian1 |
1.College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, China;
2.Unit 91189 of PLA,Lianyungang 222041,China |
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Abstract In order to investigate the anti-penetration mechanism of an aluminum foam sandwich，dividing the process of bullet impact on the structure into three stages: the plugging of facet plate, aluminum foam failure in the mode of through-thickness shearing with tearing and back face sheet failure in local disc deformation—shear plugging.According to the failure model for the components of the aluminum foam sandwich, a theoretical analysis model was deduced based on the Newton’s laws of motion and energy conservation.Using the theoretical analysis model, the energy absorption of each component part of the structure was studied.The results show that the analysis model results are in good agreement with the experiment ones and the error is less than 10%.Analyzing the absorbed energy by different component part of the sandwich structure, it is found the aluminum foam absorbs the most energy.The aluminum foam core consumes 48.9% of the total energy.The consumed energy of the back facet plate is the next and that of the front facet plate is least.The different deformation and failure modes of both facet plates are the main reason that causes the difference in energy absorption proportion.
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Received: 03 May 2017
Published: 15 September 2018
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