Prediction of initiation of transverse cracks in cross-ply CFRP laminates under fatigue loading by fatigue properties of unidirectional CFRP in 90° direction |
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| Affiliation: | 1. Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;2. Graduate School of Fundamental Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;3. Composite Materials Research Laboratories, Toray Industries, Inc., 1515 Oaza Tsutsui, Masaki-cho, Iyo-gun, Ehime 791-3193, Japan;1. Institute of Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Austria;2. Polymer Competence Center Leoben GmbH, Austria;1. ENSTA Bretagne, Laboratoire Brestois de Mécanique et des Systèmes, 2 rue François Verny, 29806 Brest Cedex 08, France;2. TrelleborgVibracoustic, ZI Nantes Carquefou, BP10419, 44474 Carquefou Cedex, France;1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Nanjing Research Institute on Simulation Technique, Nanjing 210016, China |
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| Abstract: | A fatigue life to the initiation of transverse cracks in cross-ply carbon fiber-reinforced plastic (CFRP) laminates has been predicted using properties of the fatigue strength of unidirectional CFRP in the 90° direction. In the experiments, unidirectional 90]12 laminates were used to obtain a plot of maximum stress versus number of cycles to breaking, and two types of cross-ply laminates of 0/904]S and 0/906]S were used to evaluate the initiation and multiplication of transverse cracks under fatigue loading. Transverse cracks were studied by optical microscopy and soft X-ray photography. Analytical and experimental results showed good agreement, and the fatigue life for transverse crack initiation in cross-ply laminates was predicted successfully from the fatigue strength properties of the unidirectional CFRP in the 90° direction. The prediction results showed a conservative fatigue life than the experimental results. |
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| Keywords: | A Polymer–matrix composites (PMCs) B Fatigue B Transverse cracking C Laminate mechanics |
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