An ultrasonic technique is described for detecting and sizing of two-dimensional defects. The technique is particularly suitable for detecting two-dimensional defects in certain butt-weldments which cannot be fully inspected by conventional radiographic and ultrasonic methods. Use is made of noncontact, electromagnetic-acoustic transducers to excite and detect shear horizontal (SH) wave probing signals where wavelength is long compared to the defect depth dimensions. The new technique is demonstrated in conjunction with a weld fatigue testing investigation in which it is used to detect natural weld defects and to monitor crack initiation and growth under tension-tension fatigue loading. An experimental calibration curve is given for sizing two-dimensional surface defects, and the experimental results are explained in terms of a reciprocity relationship evaluated in the elastostatic limit.

  • Supplemental Notes:
    • Sponsored in part by Department of Transportation, Washington, DC. Materials Transportation Bureau. Pub. in Applied Physics Letters 38, n12 p980-982, 15 Jun 81.
  • Corporate Authors:

    National Bureau of Standards

    Gaithersburg, MD  United States 

    Department of Transportation

    Materials Transportation Bureau, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Fortunko, C M
  • Publication Date: 1981

Media Info

  • Pagination: 3 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00346687
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Final Rpt.
  • Files: NTIS, TRIS, USDOT
  • Created Date: Jan 29 1982 12:00AM