Accelerated seawater ageing and fatigue performance of glass fibre reinforced thermoplastic composites for marine and tidal energy applications

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES Composites Part C Open Access Pub Date : 2024-05-19 DOI:10.1016/j.jcomc.2024.100470

Danijela Stankovic , Winifred Obande , Machar Devine , Ankur Bajpai , Conchúr M. Ó Brádaigh , Dipa Ray

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Abstract

The use of thermoplastic composites as a sustainable alternative to thermosets is gaining increasing popularity due to their improved recyclability at the end of life. The fatigue performance of glass fibre/acrylic, glass fibre/acrylic- polyphenylene ether, and glass fibre/epoxy specimens, under three distinct upper stress levels (R-ratio = 0.1; f = 5 Hz) was studied. S–N curves were established for these specimens both before and after immersing them for three months in seawater (temperature: 50 °C). The dry thermoplastic composites exhibited similar fatigue performance to the thermoset counterpart at higher stress levels, with thermosets showing greater endurance at lower stress levels. Interestingly, the aged specimens showed comparable fatigue endurance, with a slight advantage in favour of the thermoplastic composites and less variability in their data. This study offers important insights into the fatigue performance of thermoplastic composites, emphasising their potential as sustainable alternatives to conventional thermoset composites for various marine applications.

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用于海洋和潮汐能应用的玻璃纤维增强热塑性复合材料的加速海水老化和疲劳性能

热塑性复合材料作为热固性材料的可持续替代品，因其在报废时可回收性更强而越来越受欢迎。研究了玻璃纤维/丙烯酸、玻璃纤维/丙烯酸-聚苯醚和玻璃纤维/环氧树脂试样在三种不同的上应力水平（R 比 = 0.1；f = 5 Hz）下的疲劳性能。对这些试样在海水中浸泡三个月（温度：50 °C）前后的 S-N 曲线进行了测定。在较高应力水平下，干热塑性复合材料的疲劳性能与热固性复合材料相似，而在较低应力水平下，热固性复合材料的耐久性更强。有趣的是，老化试样的疲劳耐久性与热塑性复合材料相当，热塑性复合材料略胜一筹，其数据的可变性较小。这项研究为了解热塑性复合材料的疲劳性能提供了重要依据，强调了它们作为传统热固性复合材料的可持续替代品在各种海洋应用中的潜力。

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