Development of the long-term reliability evaluation technique of Steel/CFRP structural adhesive joint consisting of millimeters order thickness of adhesive layer for shipbuilding

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06629
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: IWATA TOSHIAKI 国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所 構造基盤技術系, 基盤技術研究グループ長 (50358397)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 構造用接着剤 / 異種材接合 / 造船 / ミリオーダー接着層厚 / 耐久性評価 / 引張せん断強度 / CFRP / 鋼

Outline of Final Research Achievements

In shipbuilding, there are advantages such as the strength improvement by the adopting of the reinforcement members made of the CFRP by replacing the welded joint with the structural adhesive joint. However, it is demanded that the dimensional accuracy management of the members is at the same level as current welding, namely structural adhesive can fill the gap of the millimeter order. The lack of the knowledge for the long-term reliability of thick adhesive layer is obstacles to the practical use.
In this study, accelerated deterioration test by high temperature high humidity, recovering test by the drying after water absorption, xenon exposure weatherability test, and salt water mist resistant test were carried out for evaluation using the deterioration estimate curve about the design adhesive strength in shipbuilding. As a result, it was revealed that the design strength where coefficient of dispersion is more than 0.4 and strength retention rate is more than 0.5 is appropriate.

Free Research Field

溶接・接着等の接合部の疲労・環境耐久性・静的に関する強度評価