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<p>The failure mode of three-dimensional (3D) needle-punched C/C-SiC composites (NP-C/C-SiCs) is complex because they are heterogeneous and demonstrate multi-scale characteristics. It is generally difficult for macroscopic experiments to fully capture the fracture mechanism of the material at a small scale. This paper presents a multi-scale methodology to examine the flexural behavior of NP ceramic-matrix composites (CMCs) considering their real microstructure. The mechanical parameters of the NP-CMCs across different scales are evaluated based on the finite element method (FEM) combined with the progressive damage analysis. Bending properties of the composite material are acquired at the macro-scale, and the damage evolution law at the meso-scale is revealed through transferring the stress history back into the low-scale model. Finally, the flexural test is performed to verify the presented method. The result indicates that the stress–deflection curve and the fracture mode obtained through the FEM simulation agree well with the experimental outcome. The dominant failure mode of 3D NP-C/C-SiCs undergoing the bending load contains matrix cracking, interface debonding, fiber/fiber bundle pull-out, and fiber fracture. The fracture of 0° fiber bundles is the main reason that causes the material to lose its load-carrying capacity.</p>

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Bending Behavior and Failure Mode of 3D Needle-Punched C/C-SiC Composites: Multi-scale Analysis and Experimental Investigation

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Kejun Tang,
  • Peng Zhang,
  • Yonggang Tong,
  • Xiubing Liang,
  • Mingjun Zhang,
  • Yang Li,
  • Hao Lan,
  • Yongle Hu,
  • Yue Xing

摘要

The failure mode of three-dimensional (3D) needle-punched C/C-SiC composites (NP-C/C-SiCs) is complex because they are heterogeneous and demonstrate multi-scale characteristics. It is generally difficult for macroscopic experiments to fully capture the fracture mechanism of the material at a small scale. This paper presents a multi-scale methodology to examine the flexural behavior of NP ceramic-matrix composites (CMCs) considering their real microstructure. The mechanical parameters of the NP-CMCs across different scales are evaluated based on the finite element method (FEM) combined with the progressive damage analysis. Bending properties of the composite material are acquired at the macro-scale, and the damage evolution law at the meso-scale is revealed through transferring the stress history back into the low-scale model. Finally, the flexural test is performed to verify the presented method. The result indicates that the stress–deflection curve and the fracture mode obtained through the FEM simulation agree well with the experimental outcome. The dominant failure mode of 3D NP-C/C-SiCs undergoing the bending load contains matrix cracking, interface debonding, fiber/fiber bundle pull-out, and fiber fracture. The fracture of 0° fiber bundles is the main reason that causes the material to lose its load-carrying capacity.