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<p>Abrasive waterjet is emerging as a highly efficient trimming technology for carbon fiber-reinforced silicon carbide composite (C/SiC) used in aerospace industry. This study employs a full-factorial experimental design to systematically investigate the effects of different traverse speeds and hydraulic pressures on the kerf characteristics and surface integrity during the AWJ trimming process of 2.5D needled C/SiC composites. Various surface defects along the tangential direction were observed and their underlying mechanisms were elucidated. The experimental results reveal that, in comparison to the exit, the entrance exhibits smooth rounded corners and superior machining quality, whereas the exit is characterized by severe wavy-list phenomena resulting from continuous edge breakage. Within a specific range of parameters, there is a significant positive correlation between kerf taper and traverse speed. Embedded abrasives were identified as the most prevalent form of damage across all samples, with their occurrence varying according to the parameter settings. Delamination primarily occurs at the interface between the warp yarn and the SiC matrix, notably appearing consistently on the lower side of the warp yarn. Additionally, the SiC matrix and warp yarn primarily undergo brittle fracture, while the weft yarn fibers and needled fibers are removed through micro-cutting under shear forces. This study provides a comprehensive theoretical and technical foundation for enhancing the machining precision of AWJ in the cutting of 2.5D needled C/SiC composites.</p>

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Surface morphology and kerf characteristics during high-efficient abrasive waterjet trimming of 2.5D C/SiC ceramic matrix composites

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Maojun Li,
  • Juju Guo,
  • Xiaodong Zhang,
  • Xujing Yang

摘要

Abrasive waterjet is emerging as a highly efficient trimming technology for carbon fiber-reinforced silicon carbide composite (C/SiC) used in aerospace industry. This study employs a full-factorial experimental design to systematically investigate the effects of different traverse speeds and hydraulic pressures on the kerf characteristics and surface integrity during the AWJ trimming process of 2.5D needled C/SiC composites. Various surface defects along the tangential direction were observed and their underlying mechanisms were elucidated. The experimental results reveal that, in comparison to the exit, the entrance exhibits smooth rounded corners and superior machining quality, whereas the exit is characterized by severe wavy-list phenomena resulting from continuous edge breakage. Within a specific range of parameters, there is a significant positive correlation between kerf taper and traverse speed. Embedded abrasives were identified as the most prevalent form of damage across all samples, with their occurrence varying according to the parameter settings. Delamination primarily occurs at the interface between the warp yarn and the SiC matrix, notably appearing consistently on the lower side of the warp yarn. Additionally, the SiC matrix and warp yarn primarily undergo brittle fracture, while the weft yarn fibers and needled fibers are removed through micro-cutting under shear forces. This study provides a comprehensive theoretical and technical foundation for enhancing the machining precision of AWJ in the cutting of 2.5D needled C/SiC composites.