Brittle Weld Selection for Optimum Performance in Crack Toughness Tests

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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
In crack arrest tests fast running cracks are usually initiated from either weld bead deposits or strain age embrittled notches. In previously reported work, tests were carried out on 15 mm thick 350WT grade steel plate using full thickness compact crack arrest (CCA) specimens with strain aged chevron notches. Crack arrest toughness (Kv) varied between 95 to 155 MPa radical m over the temperature range -40 to -15C. The steel's NDTT was -40C. The results also indicated that for optimum performance the crack starter needed to have different degrees of embrittlement depending on the specimen size and/or test material toughness. For a successful test, the higher the material crack arrest toughness leve the larger the required specimen size, and the higher the stored energy needed before crack initiation. As a result, in this case the crack starter material needs to be capable of delaying the triggering of the crack run event. Similarly, smaller specimens designed to determine lower toughness need a lower stored energy prior to crack initiation. The suitability of several weld electrodes with different hardness and toughness levels has been assessed in terms of their ability to initiate running cracks at various temperatures.
Keywords
350WT steel;Crack arrest;Crack initiation
Report Number
DREA-CR-1999-018 — Contractor Report
Date of publication
01 Mar 1999
Number of Pages
23
DSTKIM No
99-01732
CANDIS No
511649
Format(s):
Hardcopy;Document Image stored on Optical Disk

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