SYMPOSIA PAPER Published: 01 January 1997

3-D Constraint Effects on Models for Transferability of Cleavage Fracture Toughness


Since the late 1980s there has been renewed interest and progress in understanding the effects of constraint on transgranular cleavage in ferritic steels. Research efforts to characterize the complex interaction of crack tip separation processes with geometry, loading mode and material flow properties proceed along essentially two major lines of investigation: (1) multi-parameter descriptions of stationary crack-tip fields under large-scale yielding conditions, and (2) rational micromechanics models for the description of cleavage fracture which also reflect the observed scatter in the ductile-to-brittle transition (DBT) region. This article reviews the essential features of a specific example representing each approach: the J-Q extension to correlative fracture mechanics and a local approach based on the Weibull stress. Discussions focus on the growing body of 3-D numerical solutions for common fracture specimens which, in certain cases, prove significantly different from long-established plane-strain results.

Author Information

Dodds, RH
University of Illinois, Urbana, IL
Ruggieri, C
University of Illinois, Urbana, IL
Koppenhoefer, KC
University of Illinois, Urbana, IL
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Developed by Committee: E08
Pages: 179–197
DOI: 10.1520/STP12308S
ISBN-EB: 978-0-8031-5374-5
ISBN-13: 978-0-8031-2410-3