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Three-point bending of sandwich beams with aluminum foam-filled corrugated cores
Affiliation:1. School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Collaborative Innovation Center for Advanced ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;3. Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamic (HUST), Wuhan 430074, China;4. China Ship Development and Design Center, Wuhan 430064, China;5. Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan 430033, China
Abstract:Sandwich panels having metallic corrugated cores had distinctly different attributes from those having metal foam cores, the former with high specific stiffness/strength and the latter with superior specific energy absorption capacity. To explore the attribute diversity, all-metallic hybrid-cored sandwich constructions with aluminum foam blocks inserted into the interstices of steel corrugated plates were fabricated and tested under three-point bending. Analytical predictions of the bending stiffness, initial failure load, peak load, and failure modes were obtained and compared with those measured. Good agreement between analysis and experiment was achieved. Failure maps were also constructed to reveal the mechanisms of initial failure. Foam insertions altered not only the failure mode of the corrugated sandwich but also increased dramatically its bending resistance. All-metallic sandwich constructions with foam-filled corrugated cores hold great potential as novel lightweight structural materials for a wide range of structural and crushing/impulsive loading applications.
Keywords:Sandwich beam  Corrugated core  Three-point bending  Failure modes
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