Abstract
This paper contains details of mechanical testing of double cantilever beam composite specimens comprising a vacuum-assisted resin transfer molding–infused parent plate and a hand laid-up upper plate simulating a typical blade repair. The testing was carried out as part of an effort to optimize a new repair resin for a wind turbine blade manufacturing company. A number of commercial suppliers were contacted and nine resins with different formulations were selected for screening. Out of these, six were shortlisted for initial testing which was carried out in accordance with ASTM D 5528 (Test Method for Mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites) using double cantilever beam specimens. The fracture toughness values obtained from testing these repair resin candidates were compared to values obtained from the repair resin currently being used and also to those of the main blade resin. The top three repair resin candidates were identified from the double cantilever beam testing.
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