Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)
- 2002.05a
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- Pages.173-178
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- 2002
Strength Characteristics and Non-Destructive Evaluation of Composites with Heat Damage
국부열손상을 받은 복합재료의 강도특성 및 비파괴평가
- Nam, Ki-Woo (Division of Material Science and Engineering College of Engineering, Pukyong National University) ;
- Kim, Young-Un (Dept. of Material Science and Engineering College of Engineering, Pukyong National University)
- Published : 2002.05.17
Abstract
Fourier transform has been one of the most common tools to study the frequency characteristics of signals. With the Fourier transform alone, it is difficult to tell whether signal's frequency contents evolve in time or not. Except for a few special cases, the frequency contents of most signals encountered in the real world change with time. Time-frequency methods are developed recently to overcome the drawbacks of Fourier transform, which can represent the information of signals in time and frequency at the same time. In this study, heat damage process of a carbon fiber reinforced plastic(CFRP) and glass fiber reinforced plastic(GFRP) under monotonic tensile loading was characterized by acoustic emission. Different kinds of specimens were used to determine the characteristics of Strength and AE signals. Time-frequency analysis methods were employed for the analysis of fracture mechanism in CFRP such as matrix cracking, debonding and fiber fracture.
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