STEEL TRANSITION FRACTURE TOUGHNESS REFERENCE TEMPERTURE DETERMINATION

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Authors
  1. Hull, D.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Engineering Material Research, Downsview ONT (CAN)
Abstract
Quantitative measurements of cracking resistnace are needed to assess the risk of brittle fracture under service conditions in warships. This requires laboratory toughness testing at the minimum service temperature and at loading rates equivalent to hull impact events such as wave slamming and minor collisions. Material specifications for ship steels have traditionally relied on tensile strength and Charpy impact energy for quality assessments and as an indicator of structural performance. Unfortunately the data from Charpy tests cannot be used rigorously to describe the fracture of larger components or in structural calculations, and is thus not able to demonstrate adequate damage tolerance in the welded hull. A technique has recently been standardized by ASTM for determining the fracture toughness of ferritic marine construction steels and welds in the brittle-ductile transition range. Kjc toughness transition curves are generated statistically from the analysis of toughness data populations using a master curve concept. This report describes a preliminary series of tests to evaluate CSA G21 350WT steel plate using this approach, and has established that such a procedure will provide useful data for structural integrity analyses. This work is being extended to include rate effects, plate orientation, and the study of welds.
Keywords
Cleavage;350WT steel;Weibull distribution;Fracture transition
Report Number
DREA-CR-98-439 — Contract Report
Date of publication
01 Oct 1998
Number of Pages
48
DSTKIM No
99-00056
CANDIS No
509918
Format(s):
Hardcopy;Document Image stored on Optical Disk

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