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    A Fracture-Toughness Correlation Based on Charpy Initiation Energy

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    An upper-shelf correlation between fracture toughness and the energy required to initiate cracking (CVNi) in the Charpy V-notch specimen is presented. The correlation is obtained using data on 23 steels with variations in yield strength of 447 to 1696 MPa, fracture toughness of 40 to 353 kN/m, and Charpy toughness (CVN) of 22 to 192. The toughness correlation based on all the data using either CVNi or CVN is about the same and is also about equal to that of the Rolfe-Novak-Barsom (RNB) correlation. If only those data with fracture toughness less than 200 kN (1140 psi-in.) are used, the CVNi correlation is better than that obtained by RNB or one based on CVN data alone.


    fracture toughness, Charpy correlation

    Author Information:

    Norris, DM
    Technical manager, Electric Power Research Institute, Palo Alto, Calif.

    Reaugh, JE
    Division manager, Science Applications, Inc., Albuquerque, N. Mex.

    Server, WL
    Vice president, Fracture Control Corp., Goleta, Calif.

    Committee/Subcommittee: E08.07

    DOI: 10.1520/STP28798S