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Crack-Tip Shielding in Metal-Matrix Composites: Modelling Of Crack Bridging by Uncracked Ligaments

Published online by Cambridge University Press:  22 February 2011

Jian Ku Shang  and
R. O. Ritchie
Jian Ku Shang
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
R. O. Ritchie
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
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Abstract

As part of an investigation into the micro-mechanisms of crack-tip shielding associated with the growth of fatigue cracks in metal-matrix composites, simple models are developed for the role of crack bridging in high-strength aluminum alloys reinforced with SiC particulate (AI/SiCp). Based on experimental observations of crack growth, crack-tip shielding and crack-path morphology in these alloys, the bridges are found to be associated with uncracked ligaments in the wake of the crack tip, and are modelled in terms of approaches based on a critical crack-opening displacement or critical tensile strain in the ligament.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 81
Copyright
Copyright © Materials Research Society 1988

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