Hybrid carbon fiber composite lattice truss structures |
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| Affiliation: | 1. Department of Materials Science and Engineering, 395 McCormick Road, PO Box 400745, University of Virginia, Charlottesville, VA 22904-4745, United States;2. Engineering Department, University of Cambridge, Cambridge, UK;1. Center for Composite Materials, Harbin Institute of Technology, Harbin, 150001, PR China;2. Institute of Structural Mechanics and Lightweight Design, RWTH Aachen University, Wüllnerstraße 7, D-52062, Aachen, Germany;1. Shaanxi Engineering Research Center for Digital Manufacturing Technology, Northwestern Polytechnical University, Xi’an 710072, China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Laboratory of Structural Analysis for Defense Engineering and Equipment, College of Mechanics and Materials, Hohai University, Nanjing 210098, China;1. School of Mechanical Systems Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea;2. Agency of Defense Development, Daejeon, Republic of Korea;1. Laboratory of Structural Analysis for Defense Engineering and Equipment, Hohai University, Nanjing 210098, China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210007, China;3. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China;4. State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science & Technology, Nanjing 210007, China |
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| Abstract: | Carbon fiber reinforced polymer (CFRP) composite sandwich panels with hybrid foam filled CFRP pyramidal lattice cores have been assembled from linear carbon fiber braids and Divinycell H250 polymer foam trapezoids. These have been stitched to 3D woven carbon fiber face sheets and infused with an epoxy resin using a vacuum assisted resin transfer molding process. Sandwich panels with carbon fiber composite truss volumes of 1.5–17.5% of the core volume have been fabricated, and the through-thickness compressive strength and modulus measured, and compared with micromechanical models that establish the relationships between the mechanical properties of the core, its topology and the mechanical properties of the truss and foam. The through thickness modulus and strength of the hybrid cores is found to increase with increasing truss core volume fraction. However, the lattice strength saturates at high CFRP truss volume fraction as the proportion of the truss material contained in the nodes increases. The use of linear carbon fiber braids is shown to facilitate the simpler fabrication of hybrid CFRP structures compared to previously described approaches. Their specific strength, moduli and energy absorption is found to be comparable to those made by alternative approaches. |
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| Keywords: | A Carbon fiber A Polymer–matrix composites (PMCs) D Mechanical testing |
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