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논문 기본 정보

자료유형
학술대회자료
저자정보
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2008년도 재료 및 파괴부문 춘계학술대회 강연 및 논문집
발행연도
2008.5
수록면
478 - 481 (4page)

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초록· 키워드

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An elastic waves like ultrasonic and acoustic emission were used to evaluate the propagating properties of the wave in pipe, and study on mode conversion of the elastic wave due to the defects on the pipe was performed. In this study an acoustic emission (AE) sensor was used to receive the propagated ultrasonic wave. AE technique has a advantage that it can identify the received ultrasonic wave by the analysis of the AE parameters such as count, energy, frequency, duration time and amplitude. For transmitting and receiving of the wave, an universial angle wedge was manufactured. The optimum angles for transmitting of ultrasonic wave and signal receiving at the attached AE sensor on the pipe were determined. Theoretical dispersion curve was compared with the results of the time-frequency analysis based on the wavelet transformation. The received modes showed a good agreement with theoretical one. The used ultrasonic sensor was 1㎒, and AE sensor was broadband. The artificial cracks were induced in the pipe to measure the propagation characteristics of the elastic wave for the cracks. AE parameters for the received signals were also varied with the crack types in the pipe. AE parameters of amplitude and duration time were more effective factors than the analysis of mode conversion for evaluation of the cracks in the pipe.

목차

Abstract
1. Introduction
2. Materials and Experimental Procedures
3. Results and Discussions
4. Conclusions
Acknowledgement
Reference

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