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Thermal and mechanical performance of ultraviolet-curable thermosets for wind turbine blades repair


Title: Thermal and mechanical performance of ultraviolet-curable thermosets for wind turbine blades repair

Authors: Jeremi Bussieres, Bendaoud Nohair, Carl Bolduc, Eric Dugas

DOI: 10.33599/nasampe/c.23.0048

Abstract: Maintenance of wind turbine infrastructure is critical to maintain a high level of energetic efficiency and increase their lifespan. For example, wind turbine blades repairs are performed periodically to maintain performance despite the lightning storm damages, the single largest cause of unplanned downtimes [6][1] . Thermal curing thermoset use is challenging due to incomplete polymerization at lower temperature (below -10 °C). To expand the repair season in Nordic climates, the use of ultraviolet-curable thermosets is promising [7] as those can be cured at sub-ambient temperature and have faster kinetics to maintain high repair cadence. The cure kinetic of the ultraviolet-curable thermoset was first evaluated at different temperatures using Differential Scanning Calorimetry (DSC), coupled with a Photocalorimeter Accessory (PCA). After curing kinetic optimization of the UV parameters, the resin was used to prepare test laminates. The repair laminates were co-bonded under real environmental conditions with UV-LED on a typical wind turbine blade substrate for evaluation of the adhesion performance. Tensile properties of the stepped-joint repair were evaluated based on the test method ASTM D8131 [8] with coupons adapted to the cured ply thickness and stepped joints typical for the wind turbine blades construction. It was found that mechanical strength of the UV-cured repair joints was equal or better to the same joint repaired by thermal cure. To better assess the local deformation of the repair joint under tensile load, Digital Image Correlation (DIC) analysis was also used to estimate the local deformation. The results of this study will be used by the industrial partner to extend the repair season by a few months in Nordic climates.

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Conference: CAMX 2023

Publication Date: 2023/10/30

SKU: TP23-0000000048

Pages: 12

Price: $24.00

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