落錘試験によるC/C複合材料の衝撃損傷評価（C/C複合材料における吸収エネルギ－と剛性低下）

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  • Estimation of Impact Damage in C/C Composites by Drop Weight Tests (Absorbed Energy and Stiffness Reduction in C/C Composites)

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C/C composite materials have many advantages in the characteristic and the weakness of the low impact strength. Therefore, it is important to evaluate impact damage properties and the details of the impact damage mechanism. In this study, the properties and the damage process under the low-speed range is evaluated by using a drop weight impact test. The impact load-deflection diagram and the absorbed energy change for stiffness of specimen is used for evaluating the impact damage. The measured impact load signal is decomposed in approximation components and detail components, and is reduced higher mode of vibration by multiple resolution analysis in wavelet transform. The results are as follows. In impact damage evaluation of C/C composite materials, it is effective for evaluating the damage properties by using the impact load-deflection diagram and the relationship between absorbed energy and the stiffness reduction ratio.

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