RESEARCH PAPERS: Offshore Mechanics

An Analysis of a Crack in Weld by Using Near-Field as Well as Far-Field Crack Parameters

[+] Author and Article Information
M. Nakagaki

Department of Mechanical System Engineering, Kyushu Institute of Technology, Iizuka-City, Japan

C. W. Marschall, F. W. Brust

Battelle, Columbus Division, Columbus, OH 43201

J. Offshore Mech. Arct. Eng 112(4), 304-312 (Nov 01, 1990) (9 pages) doi:10.1115/1.2919871 History: Received October 15, 1987; Revised November 20, 1989


A study of ductile crack growth characteristics in stainless steel welds is reported in this paper. A hybrid-type analysis of combined experimental, analytical, and predictive procedures on the subject is addressed. The study focuses on the effects of a stress/strain interaction phenomenon occurring between the crack tip and the weld-base material interface. Clear dependence of the crack initiation fracture characteristics on the weld size relative to the specimen size was found. Also, fracture toughness of a tungsten inert gas weld is shown to be comparable to that for the base stainless steel metal, whereas that of a submerged arc weld is shown to be significantly lower than the base metal. Because of the stress/strain nonproportionality associated with a local unloading due to crack growth in a ductile material, the use of a crack-tip parameter such as ΔTP * or Ĵ -integral was emphasized. On the other hand, prediction of a crack instability was attempted using a less rigorous J -estimation scheme procedure.

Copyright © 1990 by The American Society of Mechanical Engineers
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