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

International audienceC/C-SiC composites fabricated through Liquid Silicon Infiltration were tested under monotonic tension with insitu 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 XCTimages provided explicit visualisations and quantitative measurements of the distributions of SiC-Si and theorientations of the C fibre bundles. The full-field displacement and strain fields were measured by Digital VolumeCorrelation, observing a difference in the local deformations in response to the in-axis and off-axis loading. Inboth specimens, the tensile load triggered significant strain localisations at low stress (