Master curve description of crack arrest toughness of 350WT steel


  1. Morrison, J.
  2. Pussegoda, L.N.
  3. Nethercott, R.B.
  4. Sumpter, J.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
The measurement of crack arrest fracture toughness is difficult and expensive, particularly if a representative structural element is to be tested, and the underlying theory is controversial. Small specimen test methods have been developed, but applying these to ship plate presents special challenges, primarily because the limited thickness precludes plane strain conditions in the specimen. A collaborative Operating Assignment under TTCP MAT Group Panel 1 (Metallic Materials and Processes) has recently assessed a small specimen crack arrest test method for ship plate. As part of this assignment the crack arrest toughness of 15 mm thick CSA 350WT plate has been determined using a full thickness compact specimen test procedure. A crack arrest master curve has been calculated from this data, and provided a good description of the data scatter. Comparisons were made between the crack arrest reference temperature TKa, and the crack arrest temperature estimated from NDTT. The data have also been analyzed using expected service loading for a simple structural detail. The results suggest that the proposed procedures can be used to generate useful data from ship plate for structural integrity assessment, although the technique will always require careful optimization of specimen design and testing conditions.
350WT steel;Fracture transition;Master curve;Reference temperature;Ship plate
Report Number
DREA-SR-2001-094-SES-VII-PAP-34 — Special Report
Date of publication
01 Oct 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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