Characterization of sea water ageing effects on mechanical properties of carbon/epoxy composites for tidal turbine blades |
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| Affiliation: | 1. LBMS/ENSTA-Bretagne, 29200 Brest, France;2. Ifremer, Marine Structures Laboratory, 29280 Plouzané, France;3. LBMS/IUT Brest Dept., GMP, rue de Kergoat, 29200 Brest, France;1. Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand;2. Department of Naval Architecture and Marine Engineering, University of Strathclyde, Henry Dyer Building, 100 Montrose Street, Glasgow G4 0LZ, UK;1. Airworthiness Certification Team, Defense Agency for Technology and Quality, Seoul 130-650, Republic of Korea;2. Department of Mechanical Engineering, Kyung Hee University, Yongin 446-701, Republic of Korea;3. Department of Chemistry, Inha University, Incheon 402-751, Republic of Korea;4. Department of Mechanical Engineering, University of New Orleans, LA 70148, USA;1. IFREMER, Marine Structures Laboratory, Centre de Bretagne, F-29280, France;2. Ecole Centrale de Nantes, Institut de Recherche en Génie Civil et Mécanique (GeM), F-44321 Nantes, France;3. CETIM, Technocampus EMC2, F-44340 Bouguenais, France;1. Department of Mechanical Engineering, Saginaw Valley State University, University Center, MI, USA;2. Department of Mechanical Engineering, Stony Brook University, Stony Brook, NY, USA;3. Department of Engineering, University of Mount Union, Alliance, OH, USA |
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| Abstract: | In recent years, many tidal turbine projects have been developed using composites blades. Tidal turbine blades are subject to ocean forces and sea water aggressions, and the reliability of these components is crucial to the profitability of ocean energy recovery systems. The majority of tidal turbine developers have preferred carbon/epoxy blades, so there is a need to understand how prolonged immersion in the ocean affects these composites. In this study the long term behaviour of different carbon/epoxy composites has been studied using accelerated ageing tests. A significant reduction of composite strengths has been observed after saturation of water in the material. For longer immersions only small further changes in these properties occur. No significant changes have been observed for moduli nor for composite toughness. The effect of sea water ageing on damage thresholds and kinetics has been studied and modelled. After saturation, the damage threshold is modified while kinetics of damage development remain the same. |
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| Keywords: | A. Carbon B. Seawater ageing C. Diffusion D. Mechanical testing |
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