Effect of Sea Water on Mechanical Properties of Composite Adhesive Joints Under Different Temperature Environments

Abstract

Glass fiber reinforced polymers (GFRP) are widely used in various industrial and structural applications because of their high strength-to-weight ratio, design flexibility, and better insulating properties. Adhesive bonding has emerged as a popular joining process for GFRP structures, offering advantages such as economical fabrication cost, reduced structural weight, and enhanced damage resistance. However, the long-term performance and durability of adhesive bonded joints under static and cyclic loads remain a concern. This study aims to investigate the effect of sea water exposure on the mechanical properties of adhesive joints in glass fiber reinforced polymer structures. The degradation of adhesive joints over time and under different environmental conditions, particularly temperature variations, is also examined. The study focuses on epoxy and polyester adhesives, which are commonly used in GFRP applications. Glass fiber reinforced polymer specimens are prepared using the hand layup method, with glass fibers as reinforcement and epoxy or polyester as the resin. The adhesive materials are blended with the appropriate ratios of resin and hardener, and the curing process is carried out under specific loading conditions at room temperature. Unidirectional glass fiber sheets are used to prepare laminates, and a lower viscosity epoxy curing agent is employed. The mechanical properties of the adhesive joints are evaluated and compared over time and under different temperature environments. The study aims to contribute to a better understanding of the degradation mechanisms and long-term behavior of adhesive joints in GFRP structures exposed to sea water.