In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension

Yang Chen, Yuan Shi, Camille Chateau, James Marrow

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

Abstract

C/C-SiC composites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with in situ X-ray computed tomography. The specimens had different fibre orientations with respect to the tensile direction, 0°/90° and ±45°, such that the tension accounted for in-axis and off-axis loads, respectively. The 3D XCT images provided explicit visualisations and quantitative measurements of the distributions of SiC-Si and the orientations of the C fibre bundles. The full-field displacement and strain fields were measured by Digital Volume Correlation, observing a difference in the local deformations in response to the in-axis and off-axis loading. In both specimens, the tensile load triggered significant strain localisations at low stress (<50 MPa). Strong local deformations, observed at both low and high applied stresses, were mostly in the through-thickness direction, indicating local delamination. These observations show the importance of residual stresses to damage development in C/C-SiC composites.

Original languageEnglish
Article number106390
JournalComposites Part A: Applied Science and Manufacturing
Volume145
Early online date24 Mar 2021
DOIs
Publication statusPublished - 30 Jun 2021

Keywords

  • A. Ceramic-matrix composites (CMCs)
  • B. Mechanical properties
  • C. Micro-mechanics
  • D. CT analysis

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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