Control of Stress Field at Bonding Interface by Three-Dimensional Nanospace Structures and its Application to Dissimilar Bonding Technology

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01219
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Waseda University
• Principal Investigator: Hosoi Atsushi 早稲田大学, 理工学術院, 教授 (60424800)
• Co-Investigator(Kenkyū-buntansha): 須賀 健雄 早稲田大学, 理工学術院, 准教授 (10409659) ; 岩瀬 英治 早稲田大学, 理工学術院, 教授 (70436559)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 異種接合 / 強度 / 靭性 / CFRP

Outline of Final Research Achievements

The microstructure of aluminum alloy surfaces was fabricated by laser machining, anodizing and etching treatment, and the surfaces were then coated with a silane coupling agent to develop a dissimilar bonding technology that provides high strength and high toughness to thermoplastic carbon fiber-reinforced plastics. The chemical bonding between the isocyanate silane coupling agent and the PEEK matrix resin was evaluated experimentally and by quantum chemical simulations, and it was clarified that hydrogen bonding and molecular entanglement contributed to the improved bonding properties. The microstructure of the interface also produced nano-bridging during crack propagation, and the mechanism by which this bridging suppressed the displacement opening at the crack tip and significantly improved the bond strength and fracture toughness was clarified.

Free Research Field

材料力学

Academic Significance and Societal Importance of the Research Achievements

本研究によって，トレードオフ関係にある強度と靭性の両方を向上可能な金属と繊維強化プラスチックの異種接合技術が開発された．界面の微細構造によってき裂進展時に繊維強化プラスチックの樹脂がナノスケールでブリッジングすることによって，き裂の開口を抑制し強度と靭性を両立させていることが明らかとなった．またブリッジングを生じさせるためには適切な界面強度が存在し，それらはシランカップリング剤の処理条件で制御可能なことが分かった．これらの原理を応用して幅広い接合技術に応用できる可能性がある．