Investigation of the effect of engine fuels on fibre-matrix adhesion in glass fibre reinforced polyamide

Yang, Liu and Thomason, James and Nagel, Ulf and Minty, Ross and Cruz, Camilo and De Monte, Matthias (2016) Investigation of the effect of engine fuels on fibre-matrix adhesion in glass fibre reinforced polyamide. In: 17th European Conference on Composite Materials, 2016-06-26 - 2016-06-30.

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Abstract

Glass fibre reinforced polyamides are composite materials exhibiting high levels of toughness, heat resistance and oil resistance in comparison with other reinforced thermoplastics. There has been a rapid increase in the number of moulded composites exposed to engine-related fluids (e.g. coolants and fuels) at high temperatures and/or pressure and this has led to a need for an improvement in our understanding of the performance of glass-reinforced polyamide under such conditions. The mechanical performance of these composites results from a combination of the fibre and matrix properties and the ability to transfer stresses across the fibre-matrix interface. In this work, we investigated glass fibre-polyamide adhesion during fuel conditioning with two engine fluids, ethanol-based fuel and biodiesel. Both single fibres and composite were conditioned respectively in a mini-autoclave filled with each type of fuel at elevated temperature and pressure. The fibre-matrix adhesion was then characterised by interfacial shear strength (IFSS) measured by using a self-built microbond technique. The results showed that both fuels induce significant reduction in the IFSS and the ethanol-based fuel at 130°C caused a much more detrimental effect compared to the conditioning in biodiesel at 180°C.