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Journal of Composite Materials
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On the Applicability of Elastic-plastic Fracture Mechanics to Discontinuously Reinforced Aluminum Composites

J. E. Perez Ipina

Grupo Mecánica de Fractura, U. N. Comahue/CONICET Buenos Aires 1400, 8300 Neuquén, Argentina

A. Yawny

Institut für Werkstoffe, Ruhr-Universität Bochum 44801 Bochum, Germanyyawny{at}ruhr-uni-bochum.de

C. Gonzalez Oliver

Centro Atómico Bariloche/CONICET 8400 San Carlos de Bariloche, Argentina

Fracture toughness of AA6061/Al2O3/15p and A359/SiC/15p discontinuously reinforced aluminum alloys was evaluated using an elastic-plastic methodology (JIC). KJC values derived from JIC resulted higher than critical K values obtained by the ‘straight’ application of procedures proper to linear elastic methodology. The discrepancy between both procedures is demonstrated by means of analyzing the incidence of an arbitrary annealing heat treatment on the material fracture toughness. The results indicate that elastic-plastic fracture mechanics rather than linear elastic fracture mechanics is the appropriate approach for fracture toughness evaluation of reinforced aluminum alloys.

Key Words: aluminum • composites • particle reinforced • fracture toughness.

Journal of Composite Materials, Vol. 37, No. 22, 2001-2010 (2003)
DOI: 10.1177/0021998303036269
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