Evaluation of Closed Cracks by Model Analysis of Subharmonic Ultrasound
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概要
- 論文の詳細を見る
Cracks in solids can be detected by ultrasound if they are open. However, their detection is not easy when they are closed with a closure stress, and thus it is a fundamental problem in ultrasonic testing. Subharmonics with half the input frequency is potentially useful in the detection and evaluation of such cracks, although quantitative analysis has not been established. In this work, we develop analytical and numerical theories accounting for the crack parameters, such as closure stress and crack surface conditions, for the first time. We proved their validity by comparison with experiments on a well-defined fatigue crack in aluminum alloy, finding reasonable agreements. Based on these theories, it will be possible to estimate important parameters of partially closed cracks by fitting measured waveforms to theoretical predictions, which solves the fundamental problem in ultrasonic testing of cracks.
- 2004-05-15
著者
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Mihara Tsuyoshi
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Tsuji Toshihiro
Department Of Environmental Technology And Urban Planning Nagoya Institute Of Technology
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Yamanaka Kazushi
Department Of Applied Physics Faculty Of Engineering University Of Tokyo:(present Address)mechanical
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Yamanaka Kazushi
Department of Materials Processing, Tohoku University, Aoba 02, Sendai, Japan
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Mihara Tsuyoshi
Department of Materials Processing, Tohoku University, Aoba 02, Sendai, Japan
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