STP803V1: The Jext-Integral Based on the Concept of Effective Energy Release Rate

    Miyamoto, H
    Professor of Mechanical Engineering, Faculty of Science & Technology, and assistant professor and research assistant, Mechanical Engineering, Science University of Tokyo, Noda, Chiba,

    Kageyama, K
    Researcher, Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI, Ibaraki,

    Kikuchi, M
    Professor of Mechanical Engineering, Faculty of Science & Technology, and assistant professor and research assistant, Mechanical Engineering, Science University of Tokyo, Noda, Chiba,

    Machida, K
    Professor of Mechanical Engineering, Faculty of Science & Technology, and assistant professor and research assistant, Mechanical Engineering, Science University of Tokyo, Noda, Chiba,

    Pages: 14    Published: Jan 1983


    Abstract

    The Jext-integral is introduced as the measure of the effective energy release rate in the process zone, and the expression of the two- and three-dimensional Jext-integrals are obtained. The Jext-integral is the measure of the inhomogeneities caused by the large deformation at the crack tip. The path-independent expression of the Jext-integral is also introduced, which is useful when there are the body force and the eigen stress fields. For the two-dimensional case, some properties of the Jext-integral are discussed and the relation to GΔ is shown. It is pointed out that by considering a finite region like the process zone, Jext can overcome the shortages of the energy concept as the fracture criterion. The Jext-integral is evaluated for some basic problems.

    Keywords:

    J, ext, -integral, effective energy release rate, process zone, fracture criterion, inhomogeneities, elastic-plastic fracture


    Paper ID: STP37290S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37290S


    CrossRef ASTM International is a member of CrossRef.