Abstract
ABSTRACTThere are advantages to replacing weld joints with structural adhesive joints in shipbuilding, including reduction of labor associated with hot work and straightening work. However, the dimensional accuracy of the structural members must be the same for structural adhesive and welding, so the structural adhesive must fill gaps of the millimeter order. The lack of knowledge about the long-term reliability of thick adhesive layers is an obstacle to its practical use. Therefore, accelerated deterioration tests under high temperature and high humidity, recovery tests by drying after water absorption, xenon exposure weatherability tests, and salt water mist resistance tests were conducted to obtain relationships between each deterioration factor and decreasing time of strength retention rate. The durability evaluation was carried out for SGA structural adhesives from two different manufacturers. In this study, the substrate of the structural adhesives joint was A5052. It is assumed that the aluminum substrate shear joints are used for the installation of the aluminum equipment of a ship product to the aluminum ship where distortion is easy to generate because the wall surface is a thin plate. Evaluation of the acceptable design adhesive strength in shipbuilding was carried out using the deterioration estimate curve, where each deterioration factor was combined. According to the test results of this study, the use of adhesives satisfies the acceptance criteria in the guidelines of ClassNK, which is one a global ship classification society. It is concluded that the coefficients of the design reference strength in the guidelines of ClassNK are most appropriate. Additionally, a surface flammability evaluation was carried out in accordance with the International Maritime Organization Resolution MSC.307 (88). When the substrate was changed to A5052, it was confirmed that SGA satisfied the requirements.
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