Compressive damage mechanism of GFRP composites under off-axis loading: Experimental and numerical investigations |
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| Affiliation: | 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China;2. Department of Wind Energy, Risø Campus, Technical University of Denmark, DK-4000 Roskilde, Denmark;3. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China;1. Department of Continuum Mechanics and Structural Analysis, University Carlos III of Madrid, Avda de la Universidad 30, 28911 Leganés, Madrid, Spain;2. Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506, USA;1. Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China;2. AECC Commercial Aircraft Engine Co, LTD, Shanghai 201108, China;1. Key Laboratory of Eco-Textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China;2. Key Laboratory of Advanced Textile Composites, Ministry of Education, Tianjin Polytechnic University, Tianjin 300387, China;1. Sir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;2. Institute for Technical Textiles (ITA), RWTH Aachen University, Otto-Blumenthal-Straße 1, 52074 Aachen, Germany |
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| Abstract: | Experimental and computational studies of the microscale mechanisms of damage formation and evolution in unidirectional glass fiber reinforced polymer composites (GFRP) under axial and off-axis compressive loading are carried out. A series of compressive testing of the composites with different angles between the loading vector and fiber direction were carried out under scanning electron microscopy (SEM) in situ observation. The damage mechanisms as well as stress strain curves were obtained in the experiments. It was shown that the compressive strength of composites drastically reduces when the angle between the fiber direction and the loading vector goes from 0° to 45° (by 2.3–2.6 times), and then slightly increases (when the angle approaches 80–90°). At the low angles between the fiber and the loading vector, fiber buckling and kinking are the main mechanisms of fiber failure. With increasing the angle between the fiber and applied loading, failure of glass fibers is mainly controlled by shear cracking. For the computational analysis of the damage mechanisms, 3D multifiber unit cell models of GFRP composites and X-FEM approach to the fracture modeling were used. The computational results correspond well to the experimental observations. |
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| Keywords: | A Polymer–matrix composites (PMCs) B Strength C Finite element analysis (FEA) C Computational modeling D Electron microscopy |
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