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Silicon carbide (SiC) fiber-reinforced SiC matrix composites have gained global recognition as promising thermostructural materials. A comprehensive understanding of their mechanical properties, particularly strength characteristics and complex failure mechanisms, is essential for elucidating their mechanical behavior. In this study, three distinct types of SiC fibers were combined with four different weaving architectures to fabricate eight preform variants. The composites were subsequently synthesized through chemical vapor infiltration processing. Microstructural characterization was performed using X-ray computed tomography coupled with advanced image recognition algorithms, with particular emphasis on textile architectures and porosity distribution. The investigation revealed that crack propagation within the multilayered SiC matrix demonstrates distinct periodicity, facilitating theoretical determination of in situ strength in fiber bundle units. An empirical strength model was developed, incorporating critical parameters including fiber curvature, orientation distribution, longitudinal fiber fraction, and porosity level. The model demonstrated predictive accuracy with deviations ranging from 0.78% to 29.51% compared to experimental data. Furthermore, this study proposes a unified fiber bundle curvature framework for interpreting the influence of fiber preform architecture on the tensile properties of SiC fiber-reinforced SiC matrix composites.

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Mechanical Behaviors and Failure Mechanisms of Continuous Fiber-Reinforced Silicon Carbide Matrix Composites Prepared by Chemical Vapor Infiltration

  • 动态工具书词条

  • 发表日期：

    2025年

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  • Yi Zhang

摘要

Silicon carbide (SiC) fiber-reinforced SiC matrix composites have gained global recognition as promising thermostructural materials. A comprehensive understanding of their mechanical properties, particularly strength characteristics and complex failure mechanisms, is essential for elucidating their mechanical behavior. In this study, three distinct types of SiC fibers were combined with four different weaving architectures to fabricate eight preform variants. The composites were subsequently synthesized through chemical vapor infiltration processing. Microstructural characterization was performed using X-ray computed tomography coupled with advanced image recognition algorithms, with particular emphasis on textile architectures and porosity distribution. The investigation revealed that crack propagation within the multilayered SiC matrix demonstrates distinct periodicity, facilitating theoretical determination of in situ strength in fiber bundle units. An empirical strength model was developed, incorporating critical parameters including fiber curvature, orientation distribution, longitudinal fiber fraction, and porosity level. The model demonstrated predictive accuracy with deviations ranging from 0.78% to 29.51% compared to experimental data. Furthermore, this study proposes a unified fiber bundle curvature framework for interpreting the influence of fiber preform architecture on the tensile properties of SiC fiber-reinforced SiC matrix composites.