ULTRASONIC DETECTION AND SIZING OF TWO-DIMENSIONAL DEFECTS AT LONG WAVELENGTHS. REPRINT

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

• TRT Terms: Cracking; Defects; Detection and identification; Detectors; Fatigue tests; Measurement; Nondestructive tests; Reprints; Ultrasonic tests; Wavelength; Welds
• Uncontrolled Terms: Two dimensional; Weld defects
• Subject Areas: Geotechnology; Highways; Materials; I34: Steels and Metals;

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