PSI - Issue 52

Jun Koyanagi et al. / Procedia Structural Integrity 52 (2024) 187–194 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

193 7

Damage onset index

Total of s 22 + s 33

Fig. 9 Model and boundary conditions of FEM

Fig. 10 Fatigue damage accumulation and its governing stress

5. Conclusions In this paper, we introduce our activity regarding durability of CFRP based on entropy-damage criterion in nanoscale, microscale, and mesoscale numerical simulations. For the next step we establish quantitative link between these three scales. When we fully establish this multi scale analysis, we can skip all of the experiments for parameter identifications and predict the durability of any composite materials. Thus, numerical simulations are proceeded well but the study regarding measurement of entropy is not proceeded well. In near future, we consume plenty of our effort for the establishment of entropy measurement. It would be great if we could identify the degree of degradation of CFRP by thermal measurement even at the early stage at which the any visible failure has not occurred yet. Acknowledgements Parts of this study were financially supported by JST MIRAI grant number 221036344 and KAKENHI grant number 21KK0063. References Deng, H., A. Mochizuki, M. Fikry, S. Abe, S. Ogihara & J. Koyanagi (2023) Numerical and Experimental Studies for Fatigue Damage Accumulation of CFRP Cross-Ply Laminates Based on Entropy Failure Criterion. Materials, 16.