2021 Fiscal Year Final Research Report
Fracture behavior of adhesive/fusion bonding in CFRP multi-material
| Project/Area Number |
19H02345
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 24010:Aerospace engineering-related
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
後藤 圭太 名古屋大学, ナショナルコンポジットセンター, 准教授 (00760935)
荒井 政大 名古屋大学, 工学研究科, 教授 (30260532)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 炭素繊維強化複合材料 / 接着構造 / 破壊靭性 |
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| Outline of Final Research Achievements |
This study investigated the fracture process, especially crack migration, of the adhesive/fusion bonding joint in the CFRP structure both experimentally and numerically, and revealed reasons and behavior of the crack migration. Since crack migration causes unstable fractuire of the joint, investigation of the reasons of crack migration is essential. The results of this study are therefore important knowledge for achieving the CFRP multi-material structure.
In the experimental part of this study, a number of mixed mode fracture tests (MMB tests) were performed. During the tests, in-situ crack micrography and strain analyses using digital image correlation (DIC) were performed to observe crack migration behavior. In the analytical part of this study, damage progress simulations were performed based on finite element method. The results of the simulations revealed that 1. stress triaxiality at crack tip and 2. normal stress at the adhesive/adherend interface caused the crack migration.
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| Free Research Field |
複合材料工学
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| Academic Significance and Societal Importance of the Research Achievements |
き裂偏向はCFRP接合構造の不安定破壊をもたらすため，このメカニズムの解明はCFRPマルチマテリアル構造の実現のためには不可欠であった．本研究はこのき裂偏向の原因を解明しており，CFRPマルチマテリアル構造の実現のために重要な知見が得られた．
また，学術的には，接着部の破壊進展を結合力モデル(Cohesive zone method)と連続体損傷力学(CDM)を組み合わせた有限要素モデルを提案し，これによってCFRP接合部の破壊シミュレーションを実施できるようにしたことは接着部の解析において非常に重要な成果であると考えている．
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