DEFINITION OF MUTUALLY OPTIMUM NDI AND PROOF TEST CRITERIA FOR 2219 ALUMINUM PRESSURE VESSELS. VOLUME 3: APPLICATIONS TO RAIL DEFECT EVALUATION

The technique for inspection of railroad rails containing transverse fissure defects was discussed. Both pulse-echo and pitch-catch inspection techniques were used. The pulse-echo technique results suggest that a multiple-scan approach using varying angles of inclination, three-surface scanning, and dual-direction traversing may offer promise of characterization of transverse defects. Because each scan is likely to produce a reflection indicating only a portion of the defect, summing of the individual reflections must be used to obtain a reasonably complete characterization of the defect. The ability of the collimated pitch-catch technique to detect relatively small amounts of flaw growth was shown. The method has a problem in characterizing the portions of the defect near the top surface or web intersection. The work performed was a preliminary evaluation of the prospects for automated mapping of rail flaws.

  • Corporate Authors:

    Martin Marietta Aerospace

    12250 South Highway 75
    Denver, CO  USA 
  • Authors:
    • Schwartzberg, F R
    • Toth, C J
    • King, R G
    • Todd, P H
  • Publication Date: 1979-2

Media Info

  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197954
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NASA-CR-135447
  • Contract Numbers: NAS3-17790
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM