Quantifying the three-dimensional damage and stress redistribution mechanisms of braided SiC/SiC composites by in situ volumetric digital image correlation

Brendan P. Croom, Peng Xu, Edward J. Lahoda, Christian P. Deck, Xiaodong Li

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

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 languageEnglish
Pages (from-to)238-241
Number of pages4
JournalScripta Materialia
Volume130
DOIs
StatePublished - Mar 15 2017
Externally publishedYes

Keywords

  • Ceramic matrix composites (CMC)
  • Digital image correlation
  • Fracture
  • Three-dimensional tomography

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