Constraint Effect—How to Link Between Structural Integrity Assessment and Fracture Toughness Evaluation

[+] Author and Article Information
M. Toyoda

Department of Welding and Production Engineering, Osaka University, 2-1 Yamada Oka, Suita, Osaka 565, Japan

J. Offshore Mech. Arct. Eng 119(2), 125-133 (May 01, 1997) (9 pages) doi:10.1115/1.2829054 History: Received June 01, 1995; Revised August 20, 1996; Online December 17, 2007


The difference in the degree of plastic constraint in the vicinity of a pre-existing crack brings about difficulty in the evaluation of fracture performance of weldments when using fracture toughness obtained by conventional fracture toughness test results. The constraint controlling factors can be divided into two main areas, geometrical and material factors. The effect of both factors on the stress/strain behavior in the vicinity of a crack tip is discussed systematically based on previous research and numerical analyses. It is clarified that the common fracture parameters such as J and CTOD do not always represent material constants because of the change of stress/strain behavior as a result of the difference in plastic constraint. The possibility of evaluation based on the local approach is discussed in order to link between structural integrity assessment and fracture toughness evaluation.

Copyright © 1997 by The American Society of Mechanical Engineers
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