| Project/Area Number |
22K20400
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Aoki Ryoma 東京大学, 大学院工学系研究科(工学部), 助教 (60967868)
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| Project Period (FY) |
2022-08-31 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 炭素繊維強化複合材料 / 疲労負荷 / 微視的損傷進展 / 有限要素解析 / 残留強度評価 / 炭素繊維複合材料 / 疲労損傷進展 / 微視的損傷 / 疲労寿命 |
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| Outline of Research at the Start |
本研究では，CFRP（炭素繊維強化プラスチック）の長期使用時の健全性評価に向けて，繰り返し負荷（疲労負荷）によって生じる微視的損傷を考慮した疲労損傷進展解析モデルを確立することを目指す．本手法により，CFRP積層板の層内の巨視的なき裂が形成されるまでにどれだけ微視的損傷が発生・進展するかを定量的に評価し，微視的損傷の累積メカニズムを明らかにする．さらには，微視的損傷がCFRP積層板の残留剛性・強度に与える影響を評価し，疲労寿命の予測に繋げる．
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| Outline of Final Research Achievements |
This study aimed to evaluate the integrity of carbon fiber reinforced plastics (CFRP) during long-term operation by developing a fatigue damage model that considers microscopic damage. The cumulative mechanism of microscopic damage due to fatigue loading was clarified through numerical analysis, enabling the quantitative evaluation of microscopic damage up to the formation of cracks. Additionally, the analysis was extended to handle combined fatigue conditions with two different load levels. Furthermore, a method to predict the residual strength after fatigue was established as the durability evaluation. By comparing the predicted residual strength data with experimental data from several types of CFRP laminates, the accuracy of the predictions was validated, demonstrating the utility of the method in predicting the residual strength after fatigue.
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| Academic Significance and Societal Importance of the Research Achievements |
CFRPの微視的損傷を考慮した疲労解析手法を開発し、巨視的なき裂形成に至るまでの損傷累積メカニズムを明らかにし、その損傷を定量的に評価することが可能となった。さらに、耐久性評価にとって重要な疲労後の残留強度を予測することも可能となった。これにより本手法は、航空機などの航空宇宙構造物だけでなく、近年注目を集める高圧水素タンクなどに対しても、耐久性評価を含めた設計支援技術として期待できる。
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