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IS THE COD TEST RELEVANT ON LOW CARBON AND CARBON-MANGANESE STRUCTURAL GRADE STEELS? ACMSM 9; THE NINTH AUSTRALASIAN CONFERENCE ON THE MECHANICS OF STRUCTURES AND MATERIALS, 29-31 AUGUST 1984, UNIVERSITY OF SYDNEY

The crack opening displacement (COD) test has been used to determine the fracture mode transition temperature in three structural grade steels. It has been shown in general terms, that the fracture toughness at temperatures below the transition temperature is too low for economic design. The important criterion of material performance is consequently its fracture mode transition temperature and not the specific fracture toughness at any temperature. This transition temperature of steels containing active nitrogen can be raised by ageing of the plastically deformed zone ahead of the fatigue crack used for notch extension in the COD specimens. It is suggested that this fatigue damage, even in the absence of ageing, will also alter the quasi static fracture mode transition temperature. The COD test did not show a difference in transition temperature between the three steels, whereas the Charpy test showed noticeable differences. The value of the COD test for structural grade steels is consequently questioned. (Author/TRRL)

  • Corporate Authors:

    University of Sydney

    School of Civil and Mining Engineering, Parramatta Road
    Sydney, New South Wales 2006,   Australia 
  • Authors:
    • Erasmus, L A
    • Chew, C N
  • Publication Date: 1984

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Filing Info

  • Accession Number: 00462628
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1987 12:00AM