This item is a reballot of revisions to Annex A11 originally proposed in Ballot E08(14-01). This latest revision addresses concerns expressed by a persuasive negative vote on the prior ballot. This revision adds a requirement that for the case of unstable crack extension during the test, at least one data point must lie between the 0.2 mm and 0.5 mm offset lines when determining Q. Under the original proposal, it was permissible to have all four data points lie between the 0.15 and 0.2 mm offset lines and the power law fit could be extrapolated to the intersection with the 0.2mm offset line. This is no longer the case.
Keywordscrack initiation; crack-tip opening displacement; CTOD; ductile fracture; elastic-plastic fracture toughness; fracture instability; J-integral; J