Journal
COMPOSITE STRUCTURES
Volume 258, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.113317
Keywords
Air-blast; Aluminum foam-cored sandwich plates; Failure modes; Shock wave
Categories
Funding
- National Natural Science Foundation of China [11802030, 11802031, 11902031]
- Beijing Natural Science Foundation of China [Z181100004118002]
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The study investigated the deformation and failure modes of aluminum foam-cored sandwich plates through air-blast experiments and finite element modeling, revealing different failure modes and internal stress distributions under various impacts. The research provided a theoretical basis for engineering design by establishing mathematical models to verify the findings.
In this paper, air-blast experiments were firstly carried out to investigate the deformation and failure modes of aluminum foam-cored sandwich plates. The maximum midpoint deflection of the foam-cored sandwich plates was assessed by using a 3D scanning device considering the effects of different impulses. Failure modes of each components were analyzed. Based on that, a finite element model was proposed to verify the experimental results and to gain a further understanding of the air-blast process. It was found that: (1) there was a positive correlation between the maximum midpoint deflection of the rear plate and the revised dimensionless impulses; (2) the effects of the quasi-static air pressure should be taken into account in the short-distance blast resistance structural design; (3) the major failure modes of the core layer included large overall deformation, local compression, fragmentation and fly-out; (4) the failure modes of the face sheets mainly presented as large ductile deformation and petalling. (5) The energy absorption was mainly dominated by the foamed-core part.
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