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Abstract
Underwater adhesive is used to bond carbon fiber reinforced polymer (CFRP) composites to offshore or underwater structures. However, the long-term moisture exposure poses a challenge to the reliability and service life of the underwater adhesives. Therefore, the present article aims to provide a deep understanding of the durability of the underwater adhesive and the long-term bond performance between the CFRP and steel. The hygrothermal resistances of an underwater adhesive and CFRP-adhesive-steel double cantilever beam (DCB) immersed in deionized water and seawater at 25 °C, 40 °C, and 60 °C were investigated. The degradation mechanism was determined by the chemical characterization of the adhesive. Dynamic thermomechanical properties and tensile strength degraded significantly (≥62 %) before water uptake saturation due to adhesive plasticization. A high temperature (60 °C) can improve Mode I fracture toughness by at least 68 % due to an increase in the toughness of the adhesive.
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