ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 1 September 2012
Page Count: 8

Inhomogeneity Screening Criterion for the ASTM E1921 T₀ Estimate Based on the SINTAP Lower-Tail Methodology

Wallin, Kim R. W.
VTT Technical Research Centre of Finland,

(Received 26 July 2011; accepted 17 April 2012)

Abstract

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.

Keywords:
master curve, inhomogeneity, screening criteria, SINTAP lower-tail method

Paper ID: JTE104241
DOI: 10.1520/JTE104241
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