"Sustainable Society" mission area: Full-scale R&D Project

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Elucidation of fatigue deterioration mechanism and establishment of evaluation method to estimate the remaining life of CFRP laminates

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Objective:
In the present research, we aim to construct a model that uniformly describes the structural and characteristic changes of Carbon Fiber Resigned Plastics (CFRP) deterioration accumulated due to fatigue deterioration from the micro-level to the macro-level damages. The ultimate goal is to establish a method to predict the remaining life of CFRP by evaluating the damage in the micro and macro structures of the material by measuring entropy, electron spin, thermal conductivity.

Summary:
CFRP is expected to be significantly lighter in airplanes and automobiles, and as a result, it is expected to be a material that can effectively reduce carbon dioxide emissions. To reduce CO2 emissions by extending the service life of the aircraft, it is important to evaluate the damage and remaining life of these devices during long-term use. In this study, we will elucidate the mechanism of damage occurrence and progression of the CFRPs, and construct a model of damage and destruction. By establishing CFRP fatigue deterioration diagnosis technology and combining it with a fatigue/fracture evaluation model, highly accurate remaining life evaluation will be realized. By effectively combining the fatigue/fracture model and physical property evaluation methods such as entropy, electron spin, and thermal conductivity, the damage progress of CFRP and its remaining life are appropriately evaluated, and finally the total life of the CFRP structures is doubled in the present approach.

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Fig.1 Concept of the present research.

R&D Team

[Leading Institution]
Department of Aerospace Engineering, Graduate School of Engineering, Nagoya University

[Collaborators]
High Energy Accelerator Research Organization, University of Tsukuba, Tokyo University of Science,
Nagoya University, Hokkaido University


* This project is launched by integrating the following feasibility studies;
"Quantification of Lifetime for Thermoplastic CFRP Based on Entropy Damage" (KOYANAGI Jun) , "Realization of non-destructive observation techniques of defects & cracks triggering fatigue and degradation" (KIMURA Masao), "Evaluation of Microscale Degradation based on High Sensitivity Measurement of Thermal Wave Propagation Behavior" (NAGANO Hosei), "Operando micro-measurement analysis method for CFRP composite degradation and a model for remaining life estimation" (MARUMOTO Kazuhiro) and "Development of material design and evaluation system improving long-term reliability of CFRP laminates" (ARAI Masahiro)

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