Fundamental study on nonlinear ultrasonic imaging method for closed cracks using subtraction of responses at different external loads

Yoshikazu Ohara, Yohei Shintaku, Makoto Hashimoto, Satoshi Horinouchi, Kazushi Yamanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To improve the selectivity of closed cracks with respect to linear scatterers or artifacts, we propose an extension of a novel imaging method, namely, SPACE (subharmonic phased array for crack evaluation) as well as another approach using subtraction of responses at different external loads. By applying external static or dynamic loads to closed cracks, the contact state in the cracks varies, resulting in the change in the responses at the cracks. In contrast, the linear scatterers other than cracks are independent of the external loads. Therefore, only the cracks can be extracted by subtraction of responses at different loads. In this study, we performed its fundamental experiments in a closed fatigue crack formed in an aluminum alloy A7075 specimen. Here we examined static-load dependence of SPACE images and dynamic-load dependence of linear phased array (PA) images by simulating the external loads by a servohydraulic fatigue testing machine. By subtracting the images at different external loads, we show that this method is useful in extracting only the variance in the responses related to closed cracks, with canceling the responses of other than cracks. Copyright

Original languageEnglish
Title of host publication20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society
Pages869-873
Number of pages5
Publication statusPublished - 2010 Dec 1
Event20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society - Sydney, NSW, Australia
Duration: 2010 Aug 232010 Aug 27

Publication series

Name20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society
Volume2

Other

Other20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society
CountryAustralia
CitySydney, NSW
Period10/8/2310/8/27

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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    Ohara, Y., Shintaku, Y., Hashimoto, M., Horinouchi, S., & Yamanaka, K. (2010). Fundamental study on nonlinear ultrasonic imaging method for closed cracks using subtraction of responses at different external loads. In 20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society (pp. 869-873). (20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society; Vol. 2).