酸性水と塩水中でのCFRP接着継手の強度低下

抄録

Influence of water on the shear strength of adhesive-bonded single lap joint of CFRP was investigated. A paste type of epoxy adhesive and a film type adhesive were used. The lap joints were immersed in an acidic water of pH 3, a salt water simulated seawater and a distilled water at temperatures from 30°C to 80°C for a period from 210 hours to 3000 hours. After the immersion, the adhesive shear strength was measured by tensile test. It has become clear that, the shear strength of the film-adhesive joint which had higher shear strength before the immersion decreased more than that of the paste-adhesive joint. When the adhesive was the same, the degree of deterioration in the shear strength of CFRP was not affected by the kind of water. The apparent activation energy (ΔEa) for 15, 25 and 50% deterioration of the shear strength by immersion in water was calculated. Its values were 28-36kJ/mol for the paste-adhesived joint and 45-65kJ/mol for the film-adhesived joint.