Multi-directional stiffness degradation induced by matrix cracking in composite laminates |
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| Affiliation: | 1. Department of Ocean and Mechanical Engineering, Florida Atlantic University, 777, Glades Road, Boca Raton, FL 33431, USA;2. Structural Strength Department, Research Laboratory, IHI Corporation, 1, Shin-nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa 235-8501, Japan;1. Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, PR China;2. Commercial Aircraft Engine Co., Ltd, Aero Engine Corporation of China (AECC), Shanghai 200241, PR China;1. IFREMER Centre de Bretagne, Marine Structures Laboratory, Centre de Bretagne, Plouzané, France;2. IUT de Brest, IRDL, Brest, France;1. Technical Data Analysis, Inc. (TDA), 3190 Fairview Park Drive, Suite 650, Falls Church, VA 22042, USA;2. Computational Multiphysics Systems Laboratory, US Naval Research Laboratory, Washington, DC 20375, USA;3. US Naval Air Systems Command, Patuxent River, MD 20670, USA |
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| Abstract: | A model was developed for predicting the stiffness degradation of fiber reinforced plastics (FRP), with ply configuration 0m/±θn]S, induced by matrix cracking under in-plane tension. The model assumes that the cracks in off-axis plies are uniformly distributed and a damage variable D is defined. Based on the theory of fracture mechanics, the elastic moduli of cracked matrix are obtained and indicated by the damage variable D, then the reduction of elastic moduli of laminates caused by the matrix cracks was studied. Comparison with experimental values for the glass/epoxy 903/0]S, 0/90]S and 0/±45]S laminates shows good agreement with the theoretical prediction given by the presented model. |
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