Study on detection and quantitative evaluation of fatigue cracks using surface SH waves

Yasuo Ochi, Hironori Tohmyoh, Takashi Matsumura

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The surface SH waves technique has been used to evaluate the fatigue cracks at the surface of mild steel specimens. I5y adjusting incident angle of SH wave transducer, surface SH waves passing through the surface region of materials are received. In this study, the diffraction of surface SH waves received by double-probe technique was used. Firstly, the specimens introduced surface slit were inspected. With the results that the amplitude decreased and the propagation time increased with the slit depth. Secondly, the shapes of the fatigue cracks, which initiated at a small drill hole by rotating-bending fatigue, were evaluated with the difference between the propagation time of the inspected plate with crack. Obtained results showed that the evaluated values of crack length and crack depth were good agreement with the measured values. Furthermore, this technique was applied to evaluating the crack growth behavior.The surface SH waves technique has been used to evaluate the fatigue cracks at the surface of mild steel specimens. I5y adjusting incident angle of SH wave transducer, surface SH waves passing through the surface region of materials are received. In this study, the diffraction of surface SH waves received by double-probe technique was used. Firstly, the specimens introduced surface slit were inspected. With the results that the amplitude decreased and the propagation time increased with the slit depth. Secondly, the shapes of the fatigue cracks, which initiated at a small drill hole by rotating-bending fatigue, were evaluated with the difference between the propagation time of the inspected plate with crack. Obtained results showed that the evaluated values of crack length and crack depth were good agreement with the measured values. Furthermore, this technique was applied to evaluating the crack growth behavior.

Original languageEnglish
Pages (from-to)1508-1513
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume67
Issue number661
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Crack closure
  • Crack propagation
  • Fatigue
  • Nondestructive inspection
  • Surface SH waves
  • Surface slit
  • Ultrasonic inspection

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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