Tensile properties of real unidirectional Kevlar/epoxy composites |
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| Affiliation: | 1. Université Paris-Diderot, Assistance publique–Hôpitaux de Paris, 75475 Paris, France;2. SR Consulting, 75015 Paris, France;1. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, United States;2. Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, MI 48109, United States;3. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, United States;1. Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung City, 40724, Taiwan;2. School of Textiles, Tianjin Polytechnic University, Tianjin, 300387, China;3. Department of Chemical Engineering and Materials, Ocean College, Minjiang University, Fujian, 350108, China;4. Department of Bioinformatics and Medical Engineering, Asia University, Taichung, 41354, Taiwan;5. College of Textile and Clothing, Qingdao University, Shangdong, 266071, China;6. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan;7. Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textiles, Tianjin Polytechnic University, Tianjin, 300387, China;8. Department of Fiber and Composite Materials, Feng Chia University, Taichung City, 40724, Taiwan;9. School of Chinese Medicine, China Medical University, Taichung City, 40402, Taiwan;10. Department of Fashion Design, Asia University, Taichung City, 41354, Taiwan;1. Mechanics Laboratory of Lille (LML), University of Lille 1, Villeneuve d''Ascq, 59655, France;2. R&D Center, Duy Tan University, Da Nang, Viet Nam;3. LMT, ENS Cachan, CNRS, Université Paris Saclay, 61 Avenu du Président Wilson, 94230 Cachan, France;1. School of Mechancial Sciences, Indian Institute of Technology, Bhubaneswar 752050, India;2. Department of Mechanical Engineering, Veer Surendra Sai University of Technology, Burla 768018, India |
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| Abstract: | Mechanical behaviour, tensile strength and failure modes in real unidirectional Kevlar/epoxy composites, loaded parallel to the fibres, at volume fraction (Vf) range 0.26–0.73, were investigated. It was found that the measured tensile strengths deviated from the expected values calculated from the Rule of Mixture. The deviation, which was minimal at Vf of about 0.5, was mainly due to geometrical deficiencies typical of real composites. At Vf<0.5 it could be explained by non-homogeneous fibre spread and distribution of fibres. At Vf>0.5 the deviation was explained by the increasing lack of matrix between some adjacent fibres and by squeezing of fibres. The initial part of loading was typified by straightening out of non-axial fibres, accompanied by fibre/matrix debonding. The straightening process was completed at a stress level of about 0.6–0.7 of the composite strength. Matrix damage began at this stress level and continued to develop up to final failure. Failure of Kevlar fibres was noted to occur only at an extremely short loading interval coinciding with the catastrophic final failure. This was due to the small scatter of Kevlar fibre strength. |
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