Cyclic fatigue delamination of carbon fiber-reinforced polymer-matrix composites: Data analysis and design considerations |
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| Affiliation: | 1. Laboratory for Mechanical Systems Engineering, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland;2. Chair of Material Science and Testing of Polymers, Montanuniversity Leoben, Otto Glöckel-Strasse 2, A-8700 Leoben, Austria;1. Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), P.O. Box 33535111, Tehran, Iran;2. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;1. Institute of Polymers and Composites, Hamburg University of Technology, Denickestrasse, 15, D-21073 Hamburg, Germany;2. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Centre of Expertise for Structural Mechanics, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia;2. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK;1. Laboratory of Applied Mechanics and Reliability Analysis (LMAF), Station 9, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;2. Composite Construction Laboratory (CCLab), Station 16, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland |
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| Abstract: | Activities toward standardization of fracture mechanics tests on carbon fiber-reinforced polymer-matrix (CFRP) composites have recently focused on cyclic fatigue under mode I (tensile opening), mode II (in-plane shear) and mixed-mode I/II loading. Data from recent round robins performed by Technical Committee 4 (TC4) of the European Structural Integrity Society (ESIS) and from preliminary testing of additional CFRP epoxy laminates at the authors’ laboratories are analyzed with different approaches in attempts to reduce scatter and to identify parameters for CFRP structural design. Selected test data comparing load and displacement control for the cyclic fatigue tests are also discussed. Specifically, threshold values from Paris-law data fitting are compared with values from fitting with a modified Hartman–Schijve approach. Independent of the approach used for the analysis, mode I threshold values of selected CFRP seem to be in the range between about 30 and 100 J/m2, i.e., roughly around the range of critical mode I energy release rate values (denoted by GIC) obtained from fracture testing of neat commercial epoxy resins, but clearly below quasi-static initiation GIC-values for unidirectional CFRP composites. Implications for CFRP structural design based on mode I fatigue fracture mechanics test data are briefly discussed. |
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| Keywords: | Carbon fiber reinforced polymer-matrix composites Cyclic delamination fatigue Test development Data analysis Composite structural design |
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