Volume 27, Issue 3 (May 1999)

    On the Determination of JIC Using the Stretch Zone Width Method

    (Received 15 July 1998; accepted 16 February 1999)

    CODEN: JTEOAD

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    Abstract

    The stretch zone width (SZW=12CTOD, the crack tip opening displacement) method for determining JIC involves fewer specimens and lesser size restrictions compared to the con ventional J-R curve method. However, the accuracy of the SZW-based procedure depends on each term of the J-CTOD relationship, i.e., JIC=mσCTODC. This paper presents a numerical investigation of the J-CTOD relationship, which has been carried out using a large-deformation finite element method (FEM). The slope of the blunting line (m) is computed for various combinations of yield strength-to-elastic modulus ratio (σoE), power law strain-hardening exponent (n), and different measures of stress (σ in the J-CTOD relationship). This work brings out the importance of the correct choice of the stress measure, and the one suggested here is the integral average of the flow stress [σ*=0ε*σdε/0ε*dε]. Also, an effective CTOD approach is numerically validated where a sharp fatigue precrack of fracture specimens can be substituted by one with a finite notch root radius without loss of accuracy in JIC.


    Author Information:

    Suresh, RKV
    Osmania University, Hyderabad,

    Ramakrishnan, N
    Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

    Srinivas, M
    Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad,

    Ramarao, P
    Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore,


    Stock #: JTE12161J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12161J

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    Author
    Title On the Determination of JIC Using the Stretch Zone Width Method
    Symposium , 0000-00-00
    Committee E08