Monitoring growth of closed fatigue crack using subharmonic phased array

Yoshikazu Ohara, H. Endo, M. Hashimoto, Y. Shintaku, K. Yamanaka

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

9 Citations (Scopus)

Abstract

To ensure the safety and reliability of atomic power plants and airplanes, the technique of monitoring closed fatigue cracks is requisite. Here we monitored the distribution of the crack depths and closure behavior in the length direction after 48000 and 87000 fatigue cycles using subharmonic phased array for crack evaluation (SPACE). The crack depths in the subharmonic images were larger than those in the fundamental images. Specifically, the difference was larger at near the side surface than at the center. The percentage of the closed part varied with the crack growth in the specimen. In addition, we fabricated shoe for SPACE to facilitate mechanical scanning. Thus, it was demonstrated that SPACE is useful in monitoring closed fatigue crack growth.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Pages903-909
Number of pages7
Volume1211
DOIs
Publication statusPublished - 2010 Apr 1
Event36th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE - Kingston, RI, United States
Duration: 2009 Jul 262009 Jul 31

Other

Other36th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
CountryUnited States
CityKingston, RI
Period09/7/2609/7/31

Keywords

  • Closed cracks
  • Crack growth monitoring
  • Nonlinear ultrasound
  • SPACE
  • Subharmonic waves

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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