Adhesive joints connecting the outer shells of wind turbine blades can reach up to several cm in thickness. This leads to particular requirements in terms of processing and assessment of the mechanical properties and resistance to damage of these joints. In this paper, a commercial epoxy adhesive designed for wind turbine blades, Sikapower®-830, was characterized. Rheological and mechanical properties were assessed on the bulk resin, which were obtained during this study. The yield stress of the uncured adhesive is about 400 Pa, which is required by the manufacturing process. The fracture toughness of the cured resin, KIC, is 2.79 MPa√m. Its Young's modulus is about 2.5 GPa and tensile strength is about 40 MPa. Based on its rheological properties, double cantilever beam (DCB) specimens were produced with thick adhesive layers by adding and removing spacers during production. During the DCB tests, stick-slip and crack-kinking occurred, changing from stable to unstable crack propagation. Defined sample manufacturing methods and commercial epoxy adhesive results are shown in this paper and will be used for the development of novel adhesive formulations.
|Titel||20th European conference on composite materials|
|Redacteuren||Anastasios P. Vassilopoulos, Veronique Michaud|
|ISBN van elektronische versie||9782970161400|
|Status||Published - 2022|
|Evenement||20th European Conference on Composite Materials - |
Duur: 26 jun 2022 → 30 jun 2022
|Naam||ECCM 2022 - Proceedings of the 20th European Conference on Composite Materials: Composites Meet Sustainability|
|Conference||20th European Conference on Composite Materials|
|Periode||26/06/22 → 30/06/22|
Bibliografische notaFunding Information:
The authors acknowledge funding under the Lead Agency scheme from the Research Foundation -Flanders (FWO Vlaanderen) through the project grant G031020N and the Swiss National Science Foundation (SNF) through the project grant 200021E_18944/1 with the title "Combined numerical and experimental approach for the development, testing and analysis of thick adhesive joints in large wind turbine blades”. The authors also acknowledge Sika Technology AG for providing materials and support.
©2022 Fan et al.
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