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<p>To explore the influence of SiC coating thickness on the tensile mechanical properties of Cf/SiC composites, a molecular dynamics tensile mechanical model of Cf/SiC composites is constructed, and the tensile damage of Cf/SiC composites under different SiC coating thicknesses is analyzed in depth. Analyze the relationship between the coating thickness gradient and the tensile mechanical properties, fit the multi-scale potential function of the Cf/SiC molecular dynamics, and establish the coupling model of the mechanical response of the composite material; optimize the adaptability of the simulation environment, construct the molecular dynamics differential system environment of the Cf/SiC nano-tensile, and realize the constant temperature and constant pressure simulation environment of the molecular dynamics tensile evolution of the Cf/SiC composite material. The results show that as the coating becomes thicker, crack initiation is delayed, there is a phenomenon of fiber pull-out, the interface failure strain increases, resulting in an improvement in ductility, and the elastic modulus decreases. The 0.5&#xa0;nm interface fracture is a brittle failure. As the coating thickness increases, a transition from brittle to ductile failure occurs at 1.0&#xa0;nm. The fracture mechanism no longer depends on the thickness and always remains as a ductile fracture. The 1.5&#xa0;nm interface layer enhances fracture toughness by nearly threefold by maintaining the integrity of C-C bonds and reinforcing the intermediate structure, sacrificing 8% of stiffness to increase the critical strain by 50%.</p>

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Analysis of the Tensile Mechanical Properties of Cf/SiC Composites with Different SiC Coating Thicknesses

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Yi Jiang,
  • Shiyang Zheng,
  • Jiani Yang,
  • Chunjing Xu,
  • Zengguang Lai,
  • Fei Cheng

摘要

To explore the influence of SiC coating thickness on the tensile mechanical properties of Cf/SiC composites, a molecular dynamics tensile mechanical model of Cf/SiC composites is constructed, and the tensile damage of Cf/SiC composites under different SiC coating thicknesses is analyzed in depth. Analyze the relationship between the coating thickness gradient and the tensile mechanical properties, fit the multi-scale potential function of the Cf/SiC molecular dynamics, and establish the coupling model of the mechanical response of the composite material; optimize the adaptability of the simulation environment, construct the molecular dynamics differential system environment of the Cf/SiC nano-tensile, and realize the constant temperature and constant pressure simulation environment of the molecular dynamics tensile evolution of the Cf/SiC composite material. The results show that as the coating becomes thicker, crack initiation is delayed, there is a phenomenon of fiber pull-out, the interface failure strain increases, resulting in an improvement in ductility, and the elastic modulus decreases. The 0.5 nm interface fracture is a brittle failure. As the coating thickness increases, a transition from brittle to ductile failure occurs at 1.0 nm. The fracture mechanism no longer depends on the thickness and always remains as a ductile fracture. The 1.5 nm interface layer enhances fracture toughness by nearly threefold by maintaining the integrity of C-C bonds and reinforcing the intermediate structure, sacrificing 8% of stiffness to increase the critical strain by 50%.