LAMELLAR TEARING: CAUSES AND PREVENTION

A lamellar tear takes place in three stages. In initiates by separation and void formation at inclusions in the base metal. The second stage of tearing is the formation of crack "terraces" by the linking together of individual separations. When lamellar tearing reaches stage three, the propagation process involves the joining of terraces through shear failure. The tear itself exhibits a characteristic terraced profile, and it is this step-like terrace look that distinguishes a lamellar tear from an ordinary discontinuity. Although most lamellar tears are of the order of millimeters or centimeters long, some have been encountered with lengths of several feet. Most of the time, a lamellar tear occurs beneath the surface of the base metal, where it is best detected by ultrasonics. If the crack extends to the surface, then visual, dye penetrant or magnetic particle inspection methods can be used. (TRRL)

  • Corporate Authors:

    Canadian Engineering Publications Limited

    32 Front Street, West, Suite 501
    Toronto, ONo M5J 2H9,   Canada 
  • Publication Date: 1981-6

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 40
  • Serial:
    • Engineering Digest
    • Volume: 27
    • Issue Number: 6
    • Publisher: Canadian Engineering Publications Limited

Subject/Index Terms

Filing Info

  • Accession Number: 00345795
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1982 12:00AM