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<p>This study addresses the challenge of optimizing mechanical performance in aramid/carbon fiber hybrid-reinforced polymer (A/CFHRP) composites by investigating effects of hybrid ratio. Specimens with controlled aramid/carbon fiber ratios were fabricated via vacuum-assisted resin transfer molding (VARTM). The novelty lies in the integration of high-resolution in situ X-ray computed tomography (CT) tensile testing with three-dimensional (3D) damage analysis, enabling visualization of failure mechanisms under progressive loading. 3D reconstructions revealed intralaminar damage distribution patterns and crack propagation pathways. Low aramid content (26.7 wt%) exhibited brittle carbon fiber-dominated fracture with limited crack deflection. Excess aramid (80 wt%) induced ductile pull-out mechanisms but compromised strength. Additionally, in situ CT images show that carbon-aramid hybridization can improve stress transfer and energy dissipation. This study offers a key theoretical foundation for enhancing the performance of A/CFHRP composites and also broadens the application scope of in situ CT technology.</p>

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Effects of Hybrid Ratios on Damage Evolution in Aramid/Carbon Composites: In Situ X-ray CT Analysis under Tensile Loading

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • He Yu,
  • Ju Li,
  • Mingfan Ding,
  • Xintai Ding,
  • Shibo Yang,
  • Yifan Rong,
  • Yantao Gao,
  • Sanfa Xin

摘要

This study addresses the challenge of optimizing mechanical performance in aramid/carbon fiber hybrid-reinforced polymer (A/CFHRP) composites by investigating effects of hybrid ratio. Specimens with controlled aramid/carbon fiber ratios were fabricated via vacuum-assisted resin transfer molding (VARTM). The novelty lies in the integration of high-resolution in situ X-ray computed tomography (CT) tensile testing with three-dimensional (3D) damage analysis, enabling visualization of failure mechanisms under progressive loading. 3D reconstructions revealed intralaminar damage distribution patterns and crack propagation pathways. Low aramid content (26.7 wt%) exhibited brittle carbon fiber-dominated fracture with limited crack deflection. Excess aramid (80 wt%) induced ductile pull-out mechanisms but compromised strength. Additionally, in situ CT images show that carbon-aramid hybridization can improve stress transfer and energy dissipation. This study offers a key theoretical foundation for enhancing the performance of A/CFHRP composites and also broadens the application scope of in situ CT technology.