Analysis and structural evaluation of seawater-aged composite tidal turbine blades using multi-walled carbon nanotubes and acoustic emission

IF 2.3 3区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Journal of Reinforced Plastics and Composites Pub Date : 2024-08-22 DOI:10.1177/07316844241274608

Eduardo José-Trujillo, Carlos Rubio-González, Julio A. Rodríguez-González

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Abstract

The main objective of this research was to evaluate the piezoresistive response and mechanical performance of seawater-aged blades manufactured with glass fiber/epoxy resin incorporating multi-walled carbon nanotubes (MWCNTs). MWCNTs content was 0.75 wt. %, which was sufficient to form an electric percolation network. MWCNTs were dispersed in the fiber using the spray-coating method, allowing the entire blade outer surface to gain strain self-sensing capability. Exposure of the blades with and without MWCNT to seawater caused a moisture absorption of 1.67% and 1.56%, respectively. This caused damage such as matrix cracking, and fiber/matrix interfacial debonding. These effects were manifested by an increase in tip displacement of 13% and 1.43% in the blades with and without MWCNTs, also local deformations on the blade increased. The MWCNTs induced a positive effect on piezoresistive capability, resulting in the development of sensitivity to deformation. This showed that MWCNTs in the specified content is efficient for damage detection in complex structural components even after seawater aging while retaining maximum electrical resistance change of 0.45% and 0.26% on the tensile and compressive side, respectively. With acoustic emission (AE), it was confirmed that the presence of MWCNTs acts as toughening mechanisms reducing damage such as micro-cracks in the matrix.

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利用多壁碳纳米管和声发射对海水老化复合材料潮汐涡轮机叶片进行分析和结构评估

本研究的主要目的是评估使用含有多壁碳纳米管（MWCNTs）的玻璃纤维/环氧树脂制造的海水老化叶片的压阻响应和机械性能。MWCNTs 的含量为 0.75 wt.%，足以形成电渗网络。采用喷涂方法将 MWCNTs 分散在纤维中，使整个叶片外表面获得应变自感能力。将含有和未含有 MWCNT 的叶片暴露在海水中，吸湿率分别为 1.67% 和 1.56%。这导致了基质开裂和纤维/基质界面脱粘等损伤。这些影响表现为，有无 MWCNT 的叶片的叶尖位移分别增加了 13% 和 1.43%，叶片的局部变形也有所增加。MWCNT 对压阻能力产生了积极的影响，导致对变形的敏感性提高。这表明，即使在海水老化后，指定含量的 MWCNTs 仍能有效检测复杂结构部件的损坏，同时在拉伸和压缩侧分别保持 0.45% 和 0.26% 的最大电阻变化。声发射（AE）证实，MWCNTs 的存在可作为一种增韧机制，减少基体中的微裂纹等损伤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Reinforced Plastics and Composites 工程技术-材料科学：复合

CiteScore

5.40

自引率

6.50%

发文量

审稿时长

1.3 months

期刊介绍： The Journal of Reinforced Plastics and Composites is a fully peer-reviewed international journal that publishes original research and review articles on a broad range of today''s reinforced plastics and composites including areas in: Constituent materials: matrix materials, reinforcements and coatings. Properties and performance: The results of testing, predictive models, and in-service evaluation of a wide range of materials are published, providing the reader with extensive properties data for reference. Analysis and design: Frequency reports on these subjects inform the reader of analytical techniques, design processes and the many design options available in materials composition. Processing and fabrication: There is increased interest among materials engineers in cost-effective processing. Applications: Reports on new materials R&D are often related to the service requirements of specific application areas, such as automotive, marine, construction and aviation. Reports on special topics are regularly included such as recycling, environmental effects, novel materials, computer-aided design, predictive modelling, and "smart" composite materials. "The articles in the Journal of Reinforced Plastics and Products are must reading for engineers in industry and for researchers working on leading edge problems" Professor Emeritus Stephen W Tsai National Sun Yat-sen University, Taiwan This journal is a member of the Committee on Publication Ethics (COPE).