Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 44, Issue 6B, Pages 4389-4393Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.44.4389
Keywords
closed cracks; ultrasonic testing; nonlinear ultrasonic; atomic force microscopy; subharmonics; force function; tail effect; potential energy diagram
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Subharmonics are generated at closed cracks by the nonlinear effect of large-amplitude ultrasound. This effect has the possibility of more accurate detection and evaluation of closed cracks. Also, it was reported that the tail part of the transmitted wave through the cracks has a peculiar wave, which is called the tail effect. Thus far, the mechanisms of the tail effect have not been revealed. In this paper, we introduced a realistic input wave into the previous model, which shows the interaction between closed cracks and large-amplitude ultrasound. As a result, we reproduced both the subharmonics and the tail effect for the first time. Furthermore, the mechanism was verified by comparing the input and output waveforms and using a potential energy diagram. Based on these findings, we proposed novel approaches for nondestructive evaluation of closed cracks.
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