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Communication Dans Un Congrès Année : 2024

Integrated analysis of materials for offshore wind turbine blades: mechanical and acoustical coupling

Résumé

Offshore wind turbine blades, which are critical components of renewable energy systems, require materials that have been engineered to withstand harsh marine environments and dynamic operational conditions to generate sustainable electricity. Our project centres around a comprehensive integrated analysis that combines the study of acoustic and mechanical indicators of structural degradation caused by continuous exposure to the marine environment of representative offshore wind turbine blade materials. The combination of the two approaches, acoustic and mechanical, is carried out by comparing the results obtained by these two methods on similar samples under different conditions and configurations. Two laboratories are involved in this project: the LOMC UMR 6294 is managing the accelerated hydric ageing and the ultrasonic characterisation of its consequences on the material. CIMAP UMR 6252 is carrying out sample fabrication and mechanical testing. Samples comprise a unidirectional glass-fibre and polyester resin composite laminate, integrated with a SAN (Styrene Acrylo-Nitrile) foam core. Our ongoing research involves assessing the aging impact on both the laminate composite and sandwich plate, with a specific focus on the exterior skin, which bears the brunt of the most severe environmental factors. The specimens are immersed in seawater at temperatures of 40°C and 60°C to comprehensively investigate temperature aging effects, hypothesized to be nonlinear. Various ultrasonic non-destructive characterization methods for structural health monitoring have been employed at LOMC laboratory, including experimental setups for water-coupled wave transmission through materials, air-coupled wave transmission, acoustical microscopy, and laser velocimetry, aimed at enhancing precision and results. Conversely, at the CIMAP laboratory, mechanical testing is conducted through 3- and 4-point bending tests. This testing methodology yields properties such as Young's modulus, flexural strength, flexural modulus, flexural strain, modulus of rupture, load-deflection behaviour, and energy absorption. On the one hand, first works on UD Glass-polyester Composite of 4 and 6 ply in both aged and unaged states (28 weeks for 6 plies and 15 weeks for 4 plies), have shown a small loss in the compression velocity through the thickness direction. Indeed, ultrasound velocities (compression and transverse) are supposed to undergo a degradation due to the ageing process. This is similar to the results provided by our mechanical partners who measured a loss in Young modulus. On another hand, C-scans performed on the same samples have shown that the attenuation through the thickness [1] is increasing with the ageing process. Those first results are showing a matched conclusion between the mechanical and acoustical analysis. The next step will be the study of more aged samples, in the aim to carry out acoustical indicators corroborated by destructive mechanical tests. [1] N. T. Duong, J. Duclos, L. Bizet, et P. Pareige, « Relation between the Ultrasonic Attenuation and the Porosity of a RTM Composite Plate », Physics Procedia, vol. 70, p. 554 557, janv. 2015, doi:10.1016/j.phpro.2015.08.015.
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Dates et versions

hal-04460544 , version 1 (19-02-2024)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : hal-04460544 , version 1

Citer

Khalid Aoujdad, Elhadji Amadou Ba, Pierre Maréchal, Damien Leduc, Alexandre Vivet, et al.. Integrated analysis of materials for offshore wind turbine blades: mechanical and acoustical coupling. Anglo-French Physical Acoustics Conference 2024 (AFPAC), IOP Physical Acoustics Group; Groupe d’Acoustique Physique, Sous-marine et UltraSonore (GAPSUS) of the Société Française d’Acoustique (SFA), Jan 2024, Loch Lomond, United Kingdom. ⟨hal-04460544⟩
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