Abstract
2.5D woven SiCf/SiC composites are candidate materials for high-temperature components. This work presents the flexural progressive damage behaviors of 2.5D woven SiCf/SiC composites using the combination techniques of acoustic emission (AE), digital image correlation (DIC) and X-ray micro-computed tomography (Micro-CT). 2.5D woven samples with 0° (warp) and 90° (weft) directions and 2D woven laminated samples are experimentally tested via three points bending method. Also, in this process, AE and DIC are employed to monitor the progressive damage process. Subsequently, Micro-CT is utilized to identify the internal damage evolution. The results show that the preform structures and the tested directions both have a significant influence on the mechanical properties and failure mechanisms of 2.5D woven SiCf/SiC composites. Detailly, 2.5D warp samples present the pseudo-ductile fracture, whereas 2.5D weft samples indicate the brittle fracture. Furthermore, the dominant failure mechanisms of 2.5D warp samples are mainly influenced by the bulking warps, whereas those of 2.5D weft samples are controlled by the straight wefts.
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