Acoustic emission during fatigue crack propagation in SiC particle reinforced Al matrix composites |
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Authors: | A Niklas L Froyen M Wevers L Delaey |
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Affiliation: | (1) Department of Metallurgy and Materials Engineering, K.U. Leuven, B-3001, Leuven, Belgium |
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Abstract: | The acoustic emission (AE) behavior during fatigue propagation in aluminum 6061 and aluminum 6061 matrix composites containing
5, 10, and 20 wt pct SiC particle reinforcement was investigated under tension-tension fatigue loading. The purpose of this
investigation was to monitor fatigue crack propagation by the AE technique and to identify the source(s) of AE. Most of the
AEs detected were observed at the top of the load cycles. The cumulative number of AE events was found to correspond closely
to the fatigue crack growth and to increase with increasing SiC content. Fractographic studies revealed an increasing number
of fractured particles and to a lesser extent decohered particles on the fatigue fracture surface as the crack propagation
rate(e.g., †K) or the SiC content was increased.
This article is based on a presentation made in the symposium entitled “Creep and Fatigue in Metal Matrix Composites” at the
1994 TMS/ASM Spring meeting, held February 28–March 3, 1994, in San Francisco, California, under the auspices of the Joint
TMS-SMD/ ASM-MSD Composite Materials Committee. |
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