Effect of adhesion force between crack planes on subharmonic and DC responses in nonlinear ultrasound

Yoshikazu Ohara, Tsuyoshi Mihara, Kazushi Yamanaka

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)

Abstract

Subharmonic and DC responses in nonlinear ultrasound have been expected as a possible means of detecting closed cracks. Recently, it has been reported that subharmonics in a closed crack markedly increases above a certain input wave amplitude. Such a phenomenon is called "threshold behavior". However, the mechanism of threshold behavior has yet to be elucidated. To clarify this, we introduced adhesion force as a short-range force into the previous analytical model, which expresses the nonlinear contact vibrations of crack planes with intense ultrasound and provides a DC displacement as an approximation of the subharmonic response. Consequently, upward convex curves of displacement against input wave amplitude above the threshold were reproduced for the first time. The validity of the derived analytical solution is discussed by comparison with experimentally observed subharmonics.

Original languageEnglish
Pages (from-to)194-199
Number of pages6
JournalUltrasonics
Volume44
Issue number2
DOIs
Publication statusPublished - 2006 Feb

Keywords

  • Adhesion force
  • Closed cracks
  • Nonlinear ultrasound
  • Threshold behavior of subharmonics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Fingerprint Dive into the research topics of 'Effect of adhesion force between crack planes on subharmonic and DC responses in nonlinear ultrasound'. Together they form a unique fingerprint.

Cite this