SYMPOSIA PAPER Published: 01 January 1983
STP37290S

The J -Integral Based on the Concept of Effective Energy Release Rate

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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.

Author Information

Miyamoto, H
Science University of Tokyo, Noda, Chiba, Japan
Kageyama, K
Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI, Ibaraki, Japan
Kikuchi, M
Science University of Tokyo, Noda, Chiba, Japan
Machida, K
Science University of Tokyo, Noda, Chiba, Japan
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Details
Developed by Committee: E08
Pages: I-116–I-129
DOI: 10.1520/STP37290S
ISBN-EB: 978-0-8031-4869-7
ISBN-13: 978-0-8031-0727-4