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.
- Sponsored in part by Department of Transportation, Washington, DC. Materials Transportation Bureau. Pub. in Applied Physics Letters 38, n12 p980-982, 15 Jun 81.
National Bureau of StandardsGaithersburg, MD United States
Department of TransportationMaterials Transportation Bureau, 1200 New Jersey Avenue, SE
Washington, DC United States 20590
- Fortunko, C M
- Publication Date: 1981
- Pagination: 3 p.
- 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;
- 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