Multi-scale electric impedance modeling of CFRP laminates with interlayers

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K06057
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Ehime University
• Principal Investigator: Ogi Keiji 愛媛大学, 理工学研究科(工学系), 教授 (70281194)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: CFRP / インピーダンス / モデリング

Outline of Final Research Achievements

Since CFRP (carbon fiber reinforced plastic) laminates toughened with interlayers have been used as aircraft structure, it is essential to predict electric impedance characteristics for lightening resistance. In this study, we developed a mathematical model to predict impedance of the laminate from experiment on the basis of an equivalent circuit model. As a result, it is proved that through-the-thickness resistivity depends on the size of the laminate and obeys a log-normal distribution, and that the gage factor is positive although its piezo-impedance (impedance change against load) exhibits complex behavior.

Free Research Field

複合材料工学

Academic Significance and Societal Importance of the Research Achievements

航空機の機体や風力発電のブレードにCFRP（炭素繊維強化プラスチック）が使用されているが，特に，耐衝撃性を向上させたCFRPでは層間樹脂層のおかげで導電率が低下している可能性がある。そこで層間強化型CFRP積層板の導電率（インピーダンス）特性を実験と数理モデルによって明らかにした。これにより，耐雷撃性を向上させるためのCFRPの材料設計に貢献できる。