Affiliation:
1. University of Bordeaux
2. Laboratoire des Composites Thermostructuraux (LCTS)
Abstract
Previous works have shown that ceramic matrix composites are sensitive to
delayed failure during fatigue in oxidizing environments. The phenomenon of slow crack
growth has been deeply investigated on single fibers and multifilament tows in previous
papers. The present paper proposes a multiscale model of failure driven by slow crack growth
in fibers, for 2D woven composites under a constant load. The model is based on the delayed
failure of longitudinal tows. Additional phenomena involved in the failure of tows have been
identified using fractographic examination of 2D woven SiC/SiC composite testspecimens
after fatigue tests at high temperatures. Stochastic features including random load sharing,
fiber overloading, fiber characteristics and fiber arrangement within the tows have been
introduced using appropriate density functions. Rupture time predictions are compared to
experimental data.
Publisher
Trans Tech Publications, Ltd.
Cited by
15 articles.
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