Compression and bending performances of carbon fiber reinforced lattice-core sandwich composites |
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| Affiliation: | 1. Laboratory of Structural Analysis for Defense Engineering and Equipment, College of Mechanics and Materials, Hohai University, Nanjing 210098, China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;4. College of Engineering, Peking University, Beijing 100871, China;1. Department of Automotive Engineering, School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;2. Advanced Vehicle Research Center (AVRC), Beihang University, Beijing 100191, China;3. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China;4. State Key Laboratory for Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;1. Laboratory of Structural Analysis for Defense Engineering and Equipment, College of Mechanics and Materials, Hohai University, Nanjing 210098, China;2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. College of Engineering, Peking University, Beijing 100871, China;4. Chongqing Key Laboratory of Heterogeneous Material Mechanics, School of Aerospace Engineering, Chongqing University, Chongqing 400030, China;1. Research Center of Lightweight Structures and Intelligent Manufacturing, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;3. College of Engineering, Peking University, Beijing 100871, China;1. Research Center of Lightweight Structures and Intelligent Manufacturing, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Wuhan Second Ship Design and Research Institute, Wuhan 430064, China;3. Aerospace System Engineering Shanghai, Shanghai 201108, China;4. China Academy of Launch Vehicle Technology, Beijing 100076, China |
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| Abstract: | To restrict debonding, carbon fiber reinforced lattice-core sandwich composites with compliant skins were designed and manufactured. Compression behaviors of the lattice composites and sandwich columns with different skin thicknesses were tested. Bending performances of the sandwich panels were explored by three-point bending experiments. Two typical failure mechanisms of the lattice-core sandwich structures, delaminating and local buckling were revealed by the experiments. Failure criteria were suggested and gave consistent analytical predictions. For panels with stiff skins, delamination is the dominant failure style. Cell dimensions, fracture toughness of the adhesives and the strength of the sandwich skin decide the critical load capacity of the lattice-core sandwich structure. The mono-cell buckling and the succeeding local buckling are dominant for the sandwich structures with more compliant skin sheets. Debonding is restricted within one cell in bending and two cells in compression for lattice-core sandwich panels with compliant face sheets and softer lattice cores. |
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| Keywords: | A Carbon fiber B Buckling B Debonding B Mechanical properties |
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