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RESEARCH PAPERS: Offshore Mechanics

CTOD Testing of HAZ and Analysis of Pop-In Behavior

[+] Author and Article Information
M. Koçak, K.-H. Schwalbe

GKSS-Forschungszentrum Geesthacht, Geesthacht, Federal Republic of Germany

L. Chen

Shanghai Jiao Tong University, Shanghai, Peoples Republic of China

G. Terlinde

FUCHS Metallwerke, Meinerzhagen, Federal Republic of Germany

G. Gnirss

TÜV-Essen, Federal Republic of Germany

J. Offshore Mech. Arct. Eng 112(3), 214-222 (Aug 01, 1990) (9 pages) doi:10.1115/1.2919859 History: Received June 21, 1989; Revised October 24, 1989

Abstract

HAZ CTOD tests were carried out on nonmatching bead on plate SAW weldments at room temperature. The effects of the notch position and weld metal matching on the HAZ toughness were studied by taking weld metals with three strength levels (austenitic, ferritic and martensitic weld metals). The notches were located parallel (L-type) and perpendicular (T-type) to the straight fusion line and across the beveled fusion line (cross-bond type). The results indicate the T-type CTOD specimens may be used for screening the most brittle zone of the HAZ and may to a certain extent ease the experimental difficulties of the HAZ CTOD testing. The CTOD crack initiation (pop-in) values are controlled by the microstructure of the crack tip zone and the strength of the adjacent material. The recently proposed pop-in assessment procedure was used for the evaluation of the pop-ins and results were discussed in terms of the measurements of the load drop, crack extension and the CTODjump values.

Copyright © 1990 by The American Society of Mechanical Engineers
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