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THE DETERMINATION AND APPLICABILITY OF COD (CRACK OPENING DISPLACEMENT) TEST DATA

The continuity exhibited between the linear elastic and general yielding fracture mechanics approaches has led to the adoption of a unified procedure for fracture toughness testing, in which respectively the applied force at fracture is determined and the K sub Ic calculated, or the crack tip COD is derived from clip gauge displacement measurements, using an experimental calibration procedure. Experimental results are presented to illustrate the limits to which the COD approach is confined, in an attempt to define the areas where COD can be unambiguously used. Direct photographic records of the notch profile, during loading, facilitate measurement of the effective COD at any location along the crack length, while the use of an electrical potential technique indicates the onset and extent of macroscopic fibrous crack extension. The practical implications of these results are discussed both with respect to the current definition of COD, and in terms of defect significance. (Author)

  • Corporate Authors:

    British Iron and Steel Research Association

    24 Buckingham Gate
    London SW1,   England 
  • Authors:
    • ELLIOTT, D
    • Walker, E F
    • May, M J
  • Publication Date: 1971-6

Media Info

  • Pagination: 15 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00024775
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: MG/S/7/71
  • Files: TRIS
  • Created Date: Jan 14 1974 12:00AM