Journal
APPLIED COMPOSITE MATERIALS
Volume 18, Issue 2, Pages 165-174Publisher
SPRINGER
DOI: 10.1007/s10443-010-9144-0
Keywords
Ceramic matrix composites; Acoustic emission; Damage evolution; Yarn sizes
Categories
Funding
- Natural Science Foundation, China [90405015]
- Scientific Research Foundation of Civil Aviation University of China [09QD01X]
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The damage evolutions of C/SiC composites fabricated by chemical vapor infiltration with two different sizes of yarns were compared by cyclic tensile load/unload tests accompanied with the acoustic emission (AE) monitoring. The results show that an inflexion was observed in both the evolution of hysteresis characteristics and the corresponding AE curve for composite with fine yarns, which is, however, absent for composite with coarse yarns, suggesting that the former is much closer to the tough material than the latter one. Felicity effect was observed for both composites, which is more pronounced for the composite with coarse yarns due to the large yarn sizes leading to more matrix debris inside the yarns.
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