Effects of accelerated aging on mechanical, thermal and morphological behavior of polyurethane/epoxy/fiberglass composites

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• 作者：Alexandre de Souza Rios^a ; ^b ; ^{as.rios@alu.ufc.br" class="auth_mail" title="E-mail the corresponding author} ; ^{rios@lmt.ens-cachan.fr" class="auth_mail" title="E-mail the corresponding author} ; ^{eng.alexandrerios@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Wanderley Ferreira de Amorim Jú ; nior^c ; Elineudo Pinho de Moura^a ; Enio Pontes de Deus^a ; Judith Pessoa de Andrade Feitosa^a
• 关键词：Accelerated aging ; Acoustic emission ; Damage ; Wind turbine
• 刊名：Polymer Testing
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：50
• 期：Complete
• 页码：152-163
• 全文大小：3687 K

文摘

Wind blades, an important application of polymeric composite materials, are subject to natural weathering. This study aims to evaluate mechanical, thermal and morphological behavior during accelerated aging in three thicknesses of epoxy and fiberglass polyurethane-coated composite plates used in wind turbines, in addition to testing with two acoustic emission techniques. An accelerated aging chamber simulated natural weathering mechanisms for 45, 90, 135 and 180 days. This degradation primarily reduced the mechanical properties of the thinner composites, with some damaged specimens exhibiting fiber-matrix debonding. Thermal properties deteriorated. There were no morphological changes on the polyurethane–epoxy interface; however, degradation occurred in the fiber-matrix interface on the surface exposed to radiation. The degree of chalking indicated coating deterioration on the external surface of the polyurethane. The acoustic wave propagation speed and attenuation coefficient measured prior to mechanical testing indicated the presence of damage areas.