Abstract
An experimental investigation was performed to study the fatigue behavior of plain-weave fiber fabrics reinforced C/C-SiC composites (2D C/C-SiC composites) prepared by liquid silicon infiltration (LSI) under dynamic flexural stresses at room temperature. The results indicate that the fatigue limit (105 cycles) of 2D C/C-SiC composites subjected to flexural fatigue stresses is 95 MPa, corresponding to approximately 78% of flexural strength of virgin specimens. Moreover, as the fatigue loading/unloading proceeds, both strength enhancement and strength degradation are successively observed in the post-fatigue specimens under quasi-static flexural tests. Maximum residual flexural strength (RFS) of post-fatigue specimens increases to 135.7 MPa when the 2D C/C-SiC specimens are exposed to maximum fatigue stress of 95 MPa for 5000 cycles. The microstructures and fractured surfaces indicate that evolution of RFS is determined by the interaction of matrix cracking and interfacial degradation. The interfacial debonding and relief of residual thermal stresses induced by matrix cracking are mainly responsible for the enhanced strength in the post-fatigue specimens.
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