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<p>Highly oriented carbon fiber/epoxy resin (HO–CE) composites exhibit three-dimensional anisotropic heat transfer behavior, posing significant challenges for comprehensive thermophysical property characterization of the composite and its constituents. To address this challenge, a thermal property testing system for fibers and films was developed based on the T-type probe method, the 2ω method, and the laser-spot-periodic-heating (LPH) method. The system was validated using a platinum wire and an isotropic SUS304 stainless steel film as reference materials, yielding a relative measurement uncertainty below 7.8&#xa0;% for thermophysical characterization. An HO–CE composite was fabricated using pitch-based carbon fibers and epoxy resin films. According to the measured thermal properties of the components, the thermal conductivity of the composite was successfully characterized using a sub-region fitting approach. The results reveal that the thermal conductivity along the fiber direction is approximately 300 times higher than that in the transverse direction. Overall, this work provides a comprehensive and reliable experimental foundation for investigating thermal transport behavior in anisotropic composite materials.</p>

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Comprehensive Testing System of Thermophysical Properties for Highly Oriented Carbon Fiber/Epoxy Resin Composites

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Yanhui Zhang,
  • Dongchao Zhao,
  • Rui Xu,
  • Yingjun Liu,
  • Minsu Liu,
  • Jianli Wang

摘要

Highly oriented carbon fiber/epoxy resin (HO–CE) composites exhibit three-dimensional anisotropic heat transfer behavior, posing significant challenges for comprehensive thermophysical property characterization of the composite and its constituents. To address this challenge, a thermal property testing system for fibers and films was developed based on the T-type probe method, the 2ω method, and the laser-spot-periodic-heating (LPH) method. The system was validated using a platinum wire and an isotropic SUS304 stainless steel film as reference materials, yielding a relative measurement uncertainty below 7.8 % for thermophysical characterization. An HO–CE composite was fabricated using pitch-based carbon fibers and epoxy resin films. According to the measured thermal properties of the components, the thermal conductivity of the composite was successfully characterized using a sub-region fitting approach. The results reveal that the thermal conductivity along the fiber direction is approximately 300 times higher than that in the transverse direction. Overall, this work provides a comprehensive and reliable experimental foundation for investigating thermal transport behavior in anisotropic composite materials.