Journal
ACTA MATERIALIA
Volume 124, Issue -, Pages 579-587Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.11.036
Keywords
Ceramic matrix composites (CMCs); Electrical resistivity; Mechanical behavior; Matrix multi-cracking
Funding
- SAFRAN Ceramics
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The introduction of Ceramic Matrix Composites parts in civil aeronautical engines requires a thorough understanding of their mechanical behavior. In this respect, a SiCf/PyC/[Si-B-C]m composite was submitted to room temperature tensile tests with electrical resistance monitoring and acoustic emission recording. The evolution of the electrical resistance as a function of strains was modeled using a network of resistances in series and parallel, with the introduction of locally higher resistances representing potential discontinuities in the material due to matrix microcracks. The evolution of the effective matrix crack density was deduced from the interposed unloading-reloading cycles. A high-quality correlation was found between the measured and predicted evolution of (i) the electrical resistance as a function of strains and (ii) their residual behavior observed upon unloading. A relationship is therefore established between the electrical resistance of the sample and the density of matrix cracks leading to a hindering of mechanical properties. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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