Characterization of sea water ageing effects on mechanical properties of carbon/epoxy composites for tidal turbine blades

Type Article
Date 2015-11
Language English
Author(s) Tual Nicolas1, 2, Carrere N.1, Davies PeterORCID2, Bonnemains T.3, Lolive E.3
Affiliation(s) 1 : ENSTA Bretagne, LBMS, F-29200 Brest, France.
2 : IFREMER, Marine Struct Lab, F-29280 Plouzane, France.
3 : IUT Brest, LBMS, Dep GMP, F-29200 Brest, France.
Source Composites Part A-applied Science And Manufacturing (1359-835X) (Elsevier Sci Ltd), 2015-11 , Vol. 78 , P. 380-389
DOI 10.1016/j.compositesa.2015.08.035
WOS© Times Cited 91
Keyword(s) Carbon, Seawater ageing, Diffusion, Mechanical testing
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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