Effects of temperature on delamination growth in a carbon/epoxy composite under fatigue loading |
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| Affiliation: | 1. Department of Wind Energy, Section of Composites and Materials Mechanics, Technical University of Denmark, Fredriksborgvej 399, 4000 Roskilde, Denmark;2. Department of Mechanical and Manufacturing Engineering, Aalborg University, Fibigerstraede 16, 9220 Aalborg Oest, Denmark;3. LM Wind Power Blades, Composite Mechanics, Jupitervej 6, 6000 Kolding, Denmark;4. Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;1. Saab AB, SE-581 88 Linköping, Sweden;2. Swedish Defence Research Agency, FOI, SE-172 90 Stockholm, Sweden;3. Division of Solid Mechanics, Linköping University, SE-581 83 Linköping, Sweden;1. Department of Astronautics Science and Mechanics, Harbin Institute of Technology, Harbin, PR China;2. School of Aeronautics and Astronautics, Purdue University, USA;3. School of Aeronautics, Northwestern Polytechnical University, Xi’an, PR China;4. AVIC The First Aircraft Institute, Xi’an, PR China;5. Structural Integrity and Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, The Netherlands |
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| Abstract: | This paper presents a study of delamination growth in HTA/6376C carbon fibre/epoxy laminates. Tests were conducted under Mode I, Mode II and mixed-mode static and fatigue loading at both ambient conditions and elevated temperature. The results show that the strain energy release rate threshold values for delamination growth under fatigue loading are significantly lower than the critical energy release rates in static tests. At elevated temperature, the threshold values in the fatigue loading were only about 10% of the critical values in the static tests. A fractographic analysis of the delamination growth revealed that the fracture surfaces generated at elevated temperature generally were similar to the fracture surfaces generated at room temperature. Nevertheless, some differences in morphology of the fracture surfaces were observed, and their effect on the static and fatigue delamination growth is discussed in detail. |
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