Journal article
Technologies of Wind Turbine Blade Repair: Practical Comparison
Wind Energy Materials and Components Division, Department of Wind and Energy Systems, Technical University of Denmark1
Composites Analysis and Mechanics, Wind Energy Materials and Components Division, Department of Wind and Energy Systems, Technical University of Denmark2
Department of Wind and Energy Systems, Technical University of Denmark3
Composites Manufacturing and Testing, Wind Energy Materials and Components Division, Department of Wind and Energy Systems, Technical University of Denmark4
Danish Blade Service ApS5
Maintenance and repair of wind turbines contribute to the higher costs of wind energy. In this paper, various technologies of structural repair of damaged and broken wind turbine blades are compared. The composite plates, mimicking damaged blade parts, were damaged and repaired, using various available curing and bonding technologies.
Technologies of repair with hand layup lamination, vacuum repair with hand layup and infusion, ultraviolet repair and high temperature thermal curing were compared. The repaired samples were tested under tensile static and fatigue tests, and subject to microscopic X-ray investigations. It was observed that both the strength of the repaired structures and the porosity depend on the repair technology used.
Vacuum-based technologies lead to relatively stiff and lower-strength repaired plates, while ultraviolet-curing technologies lead to average stiffness and high strength. High-temperature vacuum curing leads to the highest maximum stress. Hand layup (both vacuum and without vacuum) leads to high post-repair porosity in the adhesive and scarf, while vacuum infusion leads to low porosity.
Fatigue lifetime generally follows the trend of porosity. There exist risks of micro-damaging the parent laminate and the formation of residual stresses in the repaired structure.
Language: | English |
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Publisher: | MDPI AG |
Year: | 2022 |
Pages: | 1767 |
ISSN: | 19961073 |
Types: | Journal article |
DOI: | 10.3390/en15051767 |
ORCIDs: | Mishnaevsky Jr., Leon , Johansen, Nicolai Frost-Jensen , Fraisse, Anthony and Fæster, Søren |
T Technology maintenance repair wind energy wind turbine blades