Abstract
In this study, we conducted oxyacetylene ablation, followed by bending tests and comprehensive microstructural characterization, to investigate the mechanical behavior of C/HfC-SiC composites. The findings indicate a marked reduction in the flexural strength and fracture energy of ablated C/HfC-SiC composites, which decreased from 286.09 ± 17.56 MPa and 5.04 ± 0.27 mJ/mm2 to 190.97 ± 16.69 MPa and 3.80 ± 0.29 mJ/mm2, respectively. Notably, the fracture energy retention rate (75.40 %) of the composites exceeds the flexural strength retention rate (66.75 %). Based on the microstructure of cracks and energy release rate criterion, the failure process and crack propagation mechanism were analyzed. The ablation process was found to diminish the shear strength of the fiber-matrix interface, facilitating mechanical behaviors such as fiber debonding, slipping, and pull-out. Additionally, oxidative damage induces the simultaneous propagation of multiple cracks, thereby increasing energy consumption during the bending. These plastic mechanical behaviors not only increase the failure displacement but also enhance the plastic characteristics of the composites, allowing it to maintain higher flexural strength (from 69.3 MPa to 108.3 MPa) and fracture energy (from approximately 2.71 mJ/mm2 to 4.26 mJ/mm2) after failure (at the double failure displacement).
Published Version
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