APPLICATION OF J AND CTOD ESTIMATION FORMULAS TO NAVAL CONSTRUCTION STEELS

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Authors
  1. Morrison, J.
  2. Zhai, Z.
  3. KarisAllen, K.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Over the past two decades standardized experimental procedures for laboratory elastic-plastic toughness determination using JIc, J-R Curves, and Crack Tip Opening Displacement have all been developed and widely employed (e.g. ASTM Standards E813, E1152, and E1290), and British Standard BS 5762). These standards include the most commonly used specimen types, namely compact and three point bend geometries. Depending on the parameter being measured, for example J, there may be a requirement for measurement during the test of both specimen crack mouth opening and load-line displacement. If required, compact fracture specimens can fairly easily be modified to make the two suitably coincident. When single edge notched bend specimens are employed, however, the required instrumentation tends to become more complex, and in the case of small specimens, difficult to accommodate. It would therefore be useful if estimates of J and CTOD could be made from either mouth opening or laod line displacement. At the same time estimation formulas applicable to wider ranges of crack length would also be useful, particularly for evaluating specimens containing shorter cracks than are currently permitted in the standard procedures (1, 2). TRUNCATED
Report Number
DREA-NAMT-93-2-PAP-8 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
16
DSTKIM No
99-00586
CANDIS No
510313
Format(s):
Hardcopy;Document Image stored on Optical Disk

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