Change and extent of deterioration in the mechanical characteristics of glass/polyester composite for maritime structural applications under effects of seawater and transportation fuel: A comparative study

Abstract

This study aims to understand how aggressive environments like salt water and gasoline interact with the composite and which is more aggressive. For this purpose, a new type of composite was used, reinforced with short and woven mixed glass fibres and composed of 8 plies (Mat 350 g/m², Taffeta 450 g/m², Mat 450 g/m²) of symmetrical and unsaturated polyester resin. It was obtained by infusion moulding and cut with a diamond disc into different specimens, according to the appropriate standards. This composite was tested under two different conditions: absorption tests at room temperature (23°C) and a resilience study to determine the resistance of this material after ageing. The results obtained show that the glass/polyester composite is more sensitive to immersion in gasoline than in seawater, which results in greater, faster, and more aggressive gasoline absorption. Analysis of all the impact test results indicates that the duration and nature of the ageing environment have a significant influence on the impact resistance of the composites. Scanning electron microscopy confirmed the impact of both liquids on the composite material. There is evidence of resin failures caused by seawater and delamination caused by gasoline. These different surface failures of composites are proof of the aggressiveness of these two environments and the interest in adapting the material to them by seeking a more suitable resin and additives. This adaptation can be the subject of new studies.