Published Online: 1 September 2012
Page Count: 8
Wallin, Kim R. W.
VTT Technical Research Centre of Finland,
(Received 26 July 2011; accepted 17 April 2012)
The master curve brittle fracture toughness estimation method described in the ASTM E1921-11 test standard is based on a theoretical scatter and size effect assumption and makes use of a maximum likelihood estimation method to determine the fracture toughness transition temperature T0. The estimation method in E1921-11 is valid only for macroscopically homogeneous steels. If the steel is inhomogeneous, the maximum likelihood method applied in E1921-11 becomes unreliable. Here, a simple screening criterion, based on the SINTAP lower-tail estimation method, is proposed, and the efficiency and limitations of the criterion are shown for a variety of different types of inhomogeneity.
Paper ID: JTE104241