Mechanical behavior of carbon fiber reinforced polymer composite sandwich panels with 2-D lattice truss cores |
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| Affiliation: | 1. Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, PR China;2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, PR China;3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR 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. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education of China, College of Material Science and Engineering, Northeast Forestry University, Harbin, 150040, China;2. School of Civil Engineering, Southeast University, Nanjing, Jiangsu Province, 211189, China;3. Science and Technology on Advanced Composites in Special Environments Key Laboratory, Harbin Institute of Technology, Harbin, 150001, China;1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China;2. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, PR China;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 |
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| Abstract: | Composite sandwich structures with lattice truss cores are attracting more and more attention due to their superior specific strength/stiffness and multi-functional applications. In the present study, the carbon fiber reinforced polymer (CFRP) composite sandwich panels with 2-D lattice truss core are manufactured based on the hot-pressing method using unidirectional carbon/epoxy prepregs. The facesheets are interconnected with lattice truss members by means of that both ends of the lattice truss members are embedded into the facesheets, without the bonding procedure commonly adopted by sandwich panels. The mechanical properties of the 2-D lattice truss sandwich panels are investigated under out-of-plane compression, shear and three-point bending tests. Delamination of the facesheets is observed in shear and bending tests while node failure mode does not occur. The tests demonstrate that delamination of the facesheet is the primary failure mode of this sandwich structure other than the debonding between the facesheets and core for conventional sandwiches. |
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