ISSN: 0090-3973
Published Online: 14 May 2009
Page Count: 4

Crack Mouth Opening Displacement-Based η Factors for SE(B) Specimens

Petti, J. P.
Sandia National Laboratories,NM,

Dodds, Jr., R. H.
University of Illinois at Urbana-Champaign,IL,

Link, R. E.
U.S. Naval Academy,MD,

(Received 12 September 2008; accepted 11 April 2009)

Abstract

Three-dimensional finite element analysis of SE(B) fracture toughness specimens with crack sizes ranging from a/W=0.1–0.6 were performed to develop η^CMOD values for estimating J^pl in fracture toughness tests. The analyses included specimens with smooth sides and 20 % sidegrooves. The results for η^CMOD were 4–9 % lower than previously published results based on two-dimensional plane strain analysis. A simple linear expression for η^CMOD(a/W) was proposed for introduction into ASTM E1820 for calculating J^pl in SE(B) specimens with 0.05≤a/W≤0.7.

Keywords:
elastic-plastic fracture toughness, J-R curve, η factor, fracture toughness testing

Paper ID: JTE102116
DOI: 10.1520/JTE102116
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