Imaging of closed cracks using nonlinear response of elastic waves at subharmonic frequency

Yoshikazu Ohara, Tsuyoshi Mihara, Ryouta Sasaki, Toshihiro Ogata, Setsu Yamamoto, Yuuki Kishimoto, Kazushi Yamanaka

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)

Abstract

The authors constructed a novel apparatus based on subharmonic ultrasound for the accurate imaging of closed cracks. Linear and nonlinear responses not only from the tip but also from other parts of cracks were observed in fundamental and subharmonic images, which were changed with varying closure stress. The subharmonic images always gave an accurate length of partially closed cracks, in contrast to the fundamental images in which the crack length was underestimated. Significant similarities in generation and resonance phenomena of subharmonic waves, acoustic emission, and the vibration of microbubbles are discussed.

Original languageEnglish
Article number011902
JournalApplied Physics Letters
Volume90
Issue number1
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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