A finite element analysis of fracture initiation in ductile/brittle periodically layered composites |
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Authors: | M Jha PG Charalambides |
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Affiliation: | (1) Department of Mechanical Engineering, The University of Maryland, Baltimore County, Baltimore, MD, 21250, U.S.A |
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Abstract: | A near-tip plane strain finite element analysis of a crack terminating at and normal to the interface in a laminate consisting
of alternate brittle and ductile layers is conducted under mode-I loading. The studies are carried out for a system representing
steel/alumina composite laminate. The Gurson constitutive model, which accounts for the ductile failure mechanisms of microvoid
nucleation, growth and coalescence, is employed within the framework of small deformation plasticity theory. Evolution of
plastic zone and damage in the ductile layer is monitored with increasing load. High plastic strain localization and microvoid
damage accumulation are found to occur along the brittle/ductile interface at the crack-tip. Fracture initiation in the ductile
phase is predicted and the conditions for crack renucleation in the brittle layer ahead of the crack are established for the
system under consideration. Ductile fracture initiation has been found to occur before plasticity spreads in multiple ductile
layers. Effects of material mismatch and yield strength on the plastic zone evolution are briefly discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Fracture initiation near-tip plastic zone microvoid nucleation mode-I loading laminate composite brittle ductile |
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