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Numerical investigation of 3-D constraint effects on brittle fracture in SE(B) and C(T) specimens

By M. Nevalainen and R.H. Jr. Dodds

Abstract

This investigation employs 3-D nonlinear finite element analyses to conduct an extensive parametric evaluation of crack front stress triaxiality for deep notch SE(B) and C(T) specimens and shallow notch SE(B) specimens, with and without side grooves. Crack front conditions are characterized in terms of J-Q trajectories and the constraint scaling model for cleavage fracture toughness proposed previously by Dodds and Anderson. The 3-D computational results imply that a significantly less strict size/deformation limit, relative to the limits indicated by previous plane-strain computations, is needed to maintain small-scale yielding conditions at fracture by a stress- controlled, cleavage mechanism in deep notch SE(B) and C(T) specimens. Additional new results made available from the 3-D analyses also include revised {eta}-plastic factors for use in experimental studies to convert measured work quantities to thickness average and maximum (local) J-values over the crack front

Topics: Stresses, Crack Propagation, Numerical Analysis, Fracture Mechanics, Statistical Mechanics, 36 Materials Science, 99 Mathematics, Computers, Information Science, Management, Law, Miscellaneous, Mathematical Models, 22 Nuclear Reactor Technology, Reactor Materials, Three-Dimensional Calculations, Cleavage, Steels, Fracture Properties
Publisher: Illinois Univ., Urbana, IL (United States). Dept. of Civil Engineering
Year: 1996
DOI identifier: 10.2172/367248
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Provided by: UNT Digital Library
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