閉口き裂を映像化する非線形超音波フェーズドアレイの基礎的検討
英字タイトル:
Nonlinear Ultrasonic Imaging Method for Closed Cracks
著者:
Kazushi YAMANAKA Setsu YAMAMOTO Yoshikazu OHARA Tsuyoshi MIHARA
発刊日:
公開日:
crack size measurementfatigue cracknonlinear ultrasound
Nonlinear Ultrasonic Imaging Method for Closed Cracks
著者:
Kazushi YAMANAKA Setsu YAMAMOTO Yoshikazu OHARA Tsuyoshi MIHARA
発刊日:
公開日:
カテゴリ: 第3回
キーワードタグ:crack size measurementfatigue cracknonlinear ultrasound
概要
A new method for detection and sizing of closed crack is described which uses transient waveform of subharmonics with half input frequency i n ultrasonic nondestructive evaluation. In analogy to the resonant characteristics of vibration of bubbles in liquids, we formulate an equat ion for resonant excitation of subharmonics at partially closed cracks. The equation has been partially verified by comparison between exper imental and calculated waveforms. An apparatus for imaging closed cracks in critical components such as in atomic power plant is described.
