TY - JOUR
T1 - In situ X-ray tomography characterisation of 3D deformation of C/C-SiC composites loaded under tension
AU - Chen, Yang
AU - Shi, Yuan
AU - Chateau, Camille
AU - Marrow, James
N1 - Funding Information:
The use of facilities funded by EPSRC Grant EP/M02833X/1 “University of Oxford: experimental equipment upgrade” is gratefully acknowledged.
PY - 2021/6/30
Y1 - 2021/6/30
N2 - 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.
AB - 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.
KW - A. Ceramic-matrix composites (CMCs)
KW - B. Mechanical properties
KW - C. Micro-mechanics
KW - D. CT analysis
UR - http://www.scopus.com/inward/record.url?scp=85103257153&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2021.106390
DO - 10.1016/j.compositesa.2021.106390
M3 - Article
AN - SCOPUS:85103257153
VL - 145
JO - Composites Part A - Applied Science and Manufacturing
JF - Composites Part A - Applied Science and Manufacturing
SN - 1359-835X
M1 - 106390
ER -