Nonlinear ultrasonic phased array imaging of closed cracks using global preheating and local cooling

Yoshikazu Ohara, Koji Takahashi, Yoshihiro Ino, Kazushi Yamanaka

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

1 Citation (Scopus)

Abstract

Closed cracks are the main cause of underestimation in ultrasonic inspection, because the ultrasound transmits through the crack. Specifically, the measurement of closed-crack depth in coarse-grained materials, which are highly attenuative due to linear scatterings at the grains, is the most difficult issue. To solve this problem, we have developed a temporary crack opening method, global preheating and local cooling (GPLC), using tensile thermal stress, and a high-selectivity imaging method, load difference phased array (LDPA), based on the subtraction of phased array images between different stresses. To demonstrate our developed method, we formed a closed fatigue crack in coarse-grained stainless steel (SUS316L) specimen. As a result of applying it to the specimen, the high-selectivity imaging performance was successfully demonstrated. This will be useful in improving the measurement accuracy of closed-crack depths in coarse-grained material.

Original languageEnglish
Title of host publicationRecent Developments in Nonlinear Acoustics
Subtitle of host publication20th International Symposium on Nonlinear Acoustics including the 2nd International Sonic Boom Forum
EditorsVictor W. Sparrow, Didier Dragna, Philippe Blanc-Benon
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413320
DOIs
Publication statusPublished - 2015 Oct 28
Event20th International Symposium on Nonlinear Acoustics, ISNA 2015, including the 2nd International Sonic Boom Forum, ISBF 2015 - Ecully, Lyon, France
Duration: 2015 Jun 292015 Jul 3

Publication series

NameAIP Conference Proceedings
Volume1685
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other20th International Symposium on Nonlinear Acoustics, ISNA 2015, including the 2nd International Sonic Boom Forum, ISBF 2015
CountryFrance
CityEcully, Lyon
Period15/6/2915/7/3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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