CRACK ARREST TOUGNNESS OF A 350WT PLATE AND ITS HEAT AFFECTED ZONE

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Authors
  1. Pussegoda, L.N.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Fleet Technology Ltd, Kanata ONT (CAN)
Abstract
Two types of full thickness compact crack arrest (CCA) specimen have been used to characterise the crack arrest toughness of a 15 mm thick ship plate in both the L-T and T-L orientations. One was a modified version of the plane strain technique used in ASTM Standard E1221. The other was based on a proposed procedure for non-plane strain testing with a strain age embrittled chevron notch used as the crack starter. The testing was performed over the temperature range from -40 degrees (the nil-ductility transition temperature of the steel) up to -5C. None of the results from the ASTM E1221 type specimens met the validity requirements of the procedure. The specimens had the largest dimensions allowed in the test specification, but their limited thickness made them too small for valid plane strain testing. In contrast, for the non-plane strain test procedure, the specimen dimensions are scaled to the expected crack arrest toughness at the test temperature, and the main qualifying requirement is for the crack to be arrested at a point in the specimen lying within certain defined positions. Although difficulties were encountered with variability in run/arrest behaviour, this specimen gave some useful crack arrest toughness data for this steel, particularly when testing near the tope of the test temperature range. The effectiveness of the crack starter technique is also discussed, as well as possible modifications for future tests.
Keywords
350WT steel;High strain rate;Stretch zone;HAZ
Report Number
DREA-CR-98-416 — Contractor Report
Date of publication
01 Jan 1998
Number of Pages
50
DSTKIM No
98-01436
CANDIS No
508282
Format(s):
Hardcopy;Document Image stored on Optical Disk

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