Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 145, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106390
Keywords
A; Ceramic-matrix composites (CMCs); B; Mechanical properties; C; Micro-mechanics; D; CT analysis
Funding
- EPSRC [EP/M02833X/1]
- EPSRC [EP/M02833X/1] Funding Source: UKRI
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C/C-SiC composites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with in situ X-ray computed tomography. The 3D XCT images provided explicit visualisations and quantitative measurements of the distributions of SiC-Si and the orientations of the C fibre bundles. Strong local deformations, observed at both low and high applied stresses, were mostly in the through-thickness direction, indicating local delamination, highlighting the importance of residual stresses to damage development in C/C-SiC composites.
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.
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