Finite Element Analysis for Fracture Toughness Testing
Publication: Journal of Engineering Mechanics
Volume 109, Issue 3
Abstract
The physically important effects of material anisotropy and nonlinearity on a fracture toughness parameter, the J‐integral, are investigated numerically for some representative testing geometries. An anisotropic nonlinear model, calculating stress as a function of strain to second order, was computer coded for implementation in a finite element program. Analyses were then performed for two common testing geometries, namely the standard “compact tension” specimen and the internally pressurized radially‐cracked jacketed annulus. After obtaining the resulting states of stress and strain by finite element discretization, the J‐integral was calculated along several paths around the crack, to confirm path‐independence. For a linear transversely isotropic material it was discovered that crack orientation can strongly affect the toughness calculated for given loading conditions, and can even remove geometric domains of stable crack growth or relevance of conventional formulas; appreciable nonlinear effects are also found. The two chosen geometries, exemplifying stable vs. unstable crack growth, also provide an interesting contrast in their response to these various material characteristics.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 109 • Issue 3 • August 1983
Pages: 741 - 755
Copyright
Copyright © 1983 ASCE.
History
Published online: Aug 1, 1983
Published in print: Aug 1983
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