Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 13, Pages 4403-4418Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.04.060
Keywords
Ceramic matrix composites; In situ X-ray computed tomography; FFT simulation; Crack detection; Crack propagation scenario
Categories
Funding
- CEA/CNRS program Defi NEEDS Materiaux
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Crack initiation and propagation in three braided SiC/SiC composite tubes with different braiding angles are investigated by in situ tensile tests with synchrotron micro-computed tomography. Crack networks are precisely detected after an image subtraction procedure based on Digital Volume Correlation. FFT based simulations are performed on the full-resolution 3D images to assess elastic stress/strain fields. Quantitative measurements of the crack geometries are performed using a novel method based on grey levels. The results show that braiding angle has no obvious effect on the location of crack onsets (initiation always occurs at tow interfaces), whereas it significantly affects the paths of crack propagation. This work provides an explicit demonstration of the crack propagation scenarios with respect to the mesoscopic fibre architectures.
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