@inproceedings{9afe1553d54943b9abbcf3ff46cbd1b4,
title = "Generation of low-frequency components in ultrasonic waves penetrating the interface between contacting solids",
abstract = "It is difficult to detect a closed crack by conventional ultrasonic testing. However, nonlinear ultrasonics may be useful for detection of a closed crack in structures. This study experimentally examined propagation of ultrasonic waves through the interface between contacting solids. We simulated a closed crack by compressing two aluminum blocks. The input frequency was changed in the range of 1.0-2.0MHz and two different types of surface roughness of specimens were used. As a result, generation of low-frequency components at about 600 kHz was found regardless of the input frequency. Such a feature of low-frequency components is different from that of subharmonics. Additionally, this phenomenon was not confirmed in specimens with smoother surface. Therefore, surface roughness can be one of important factors of generating low-frequency components. The results suggest that these low-frequency components can be useful for detecting a closed crack.",
keywords = "Closed Crack, Interface, Low-frequency Components, Ultrasonic",
author = "H. Tanaka and T. Okamoto and K. Kurihara and T. Sugiura",
year = "2014",
month = jan,
day = "1",
doi = "10.1063/1.4865034",
language = "English",
isbn = "9780735412118",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
pages = "1745--1749",
booktitle = "40th Annual Review of Progress in Quantitative Nondestructive Evaluation - Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing",
note = "40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013 ; Conference date: 21-07-2013 Through 26-07-2013",
}