Paper number 1118

MECHANICAL BEHAVIOR OF A 2D SIC/SIC COMPOSITE WITH A MULTILAYERED MATRIX

P. Forio, J. Lamon

Laboratoire des Composites Thermostructuraux
UMR 5801 (CNRS-SNECMA/SEP-UB1-CEA)
3, Allée de la Boétie, 33600 Pessac, France

Summary

The mechanical behavior of a new generation of 2D Nicalon/SiC composite with a multilayered matrix, made by chemical vapor infiltration (CVI), has been investigated under tensile loading at room temperature. Damage was observed on the specimens under load using an optical microscope. Acoustic emission was analysed in terms of number of counts, amplitude distribution, and number of events. The influence of the microstructure and of pre-existing cracks was determined. Comparison of damage observations with acoustic emission data and the mechanical behavior showed that matrix cracking is the preponderant damage mechanism, and allowed the contribution of crack families to be evaluated.

Keywords

2D SiC/SiC composite, multilayered matrix, damage, acoustic emission.