Split Hopkinson pressure bar testing of 3D multi-axial warp knitted carbon/epoxy composites |
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| Affiliation: | 1. Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-Inspired Energy Materials and Devices, School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, PR China;3. AFM, School of Aerospace, Tsinghua University, Beijing 100084, PR China;4. China Academy of Machinery of Science & Technology, Beijing 100044, PR China;1. Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Genting Kelang, 53300 Setapak, Kuala Lumpur, Malaysia;2. Radiation Processing Technology Division, Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor, Malaysia;3. Department of Mechanical Engineering, University of New Orleans, New Orleans, LA 70148, USA;4. Department of Polymer Engineering, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia;1. Department of Mathematics and Statistics, Faculty of Science, King Faisal University, P.O. Box 400, Hofuf 31982, Saudi Arabia;2. Department of Mathematics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt;1. Department of Mechanical Engineering, Arak Branch, Islamic Azad University, Arak, Iran;2. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;3. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;4. Young Researchers and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano SA, Italy;2. Institute of Materials Science and Technology, Vienna University of Technology, Favoritenstrasse 9-11, A-1040 Vienna, Austria |
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| Abstract: | High-strain-rate compression experiments were performed on 3D MWK carbon/epoxy composites with different fiber architectures at room and elevated temperature using an SHPB apparatus. Macro-fracture and SEM micrographs were examined to understand the failure mechanism. The results show the dynamic properties increase with the strain rate and show a high-strain-rate sensitivity. Meanwhile, composites with 0°/0°/0°/0°] have higher properties. Moreover, composites show temperature sensitivity and the properties decrease significantly, especially for composites with 0°/90°/+45°/?45°]. The results also indicate composites take on more serious damage and failure with the strain rate. The failure of composites with 0°/0°/0°/0°] behaves in multiple delaminating, overall expansion and 0° fibers tearing. While that of composites with 0°/90°/+45°/?45°] is mainly interlaminar delaminating, local fibers tearing and fracture on different fiber layers. In addition, with increasing the temperature, the composite shows less fracture and becomes more plastic. The damage of matrix yielding, interface debonding and twisting of fibers increase significantly. |
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| Keywords: | A 3-Dimensional reinforcement B Mechanical properties D Mechanical testing E Braiding |
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