Abstract
Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC composites. Hoop strain varied significantly through the composite thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC composite.
Original language | English |
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Pages (from-to) | 238-241 |
Number of pages | 4 |
Journal | Scripta Materialia |
Volume | 130 |
DOIs | |
State | Published - Mar 15 2017 |
Externally published | Yes |
Keywords
- Ceramic matrix composites (CMC)
- Digital image correlation
- Fracture
- Three-dimensional tomography