Engineering Fracture Mechanics, Vol. 68, No. 12, pp.1417-1432, 2001
G.H. Paulino,
Department of Civil and Environmental Engineering, University of Illinois
at Urbana-Champaign, Newmark Laboratory, 205 North Mathews Avenue, IL 61801,
U.S.A.
J. C. Gibeling, R. D. Carpenter, W. W.
Liang and Z. A. Munir
Department of Chemical Engineering, University of California, Davis, CA 95616-5294,
U.S.A.
Abstract
This paper presents the results of fracture experiments and corresponding finite element
analyses (FEA) of pure titanium. This investigation was motivated by the desire to
develop a J-R testing protocol and numerical procedures which are applicable to a Ti/TiB
layered functionally graded material system. Tensile tests and a two-dimensional
axisymmetric finite element model were used to determine the plasticity data for the
titanium. Crack growth experiments were conducted in three-point bending using
single edge notched bend specimens. Three-dimensional FEA of crack growth initiation
and two-dimensional FEA with automatic crack propagation were performed to model fracture
properties of the material. Two crack propagation criteria were used: (a)
crack length versus (pseudo-)time and (b) crack length versus crack mouth opening
displacement. Essentially, these criteria were used to calibrate the finite element
models to the experimental data. The subsequent predictions of the nonlinear finite
element models are in reasonable agreement with the measured value of J at initiation and
with the rising J-R data during crack propagation.
Key words: titanium, elastoplastic fracture mechanics, crack resistance curves, J-R, d-R, crack mouth opening displacement, finite element analysis.
Representative Results:
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Testing / Analysis of a CP Ti |