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<p>To enhance the performance of short-cut carbon fiber reinforced polymer (SCFRP) composites and address the ambiguity in existing research regarding the influence of process parameters—such as dispersion liquid dynamic viscosity, plateau velocity, and inlet pressure on carbon fiber orientation, this research employs extrusion-based 3D printing technology. By integrating Fluent-EDEM coupled simulation with experimental validation, the orientation mechanism of carbon fibers within the flow field is investigated, and process parameters are optimized. Through single-factor experiments, the effects of inlet pressure, suspension dynamic viscosity, and platform movement speed on the orientation function were analyzed. A response surface method was employed to establish a regression model for optimizing process parameters. The results indicate that the carbon fiber orientation process comprises three distinct stages: shear flow-dominated, shear-tension flow transition, and tension flow-dominated. Under optimal parameters, the experimentally measured average orientation function reached 0.941, exhibiting an error of only 1.06% compared to the predicted value. The high orientation function enhanced the composite material’s strength by 157% relative to low-orientation samples, validating the effectiveness of this optimization scheme.</p>

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Effect of Liquid Rheological Properties on Carbon Fiber Orientation by Varying Process Parameters

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Chen Wang,
  • JunLin Li,
  • Yunchao Chen,
  • Zhikang Cao,
  • Chunjing Zhao,
  • Jianguo Liang

摘要

To enhance the performance of short-cut carbon fiber reinforced polymer (SCFRP) composites and address the ambiguity in existing research regarding the influence of process parameters—such as dispersion liquid dynamic viscosity, plateau velocity, and inlet pressure on carbon fiber orientation, this research employs extrusion-based 3D printing technology. By integrating Fluent-EDEM coupled simulation with experimental validation, the orientation mechanism of carbon fibers within the flow field is investigated, and process parameters are optimized. Through single-factor experiments, the effects of inlet pressure, suspension dynamic viscosity, and platform movement speed on the orientation function were analyzed. A response surface method was employed to establish a regression model for optimizing process parameters. The results indicate that the carbon fiber orientation process comprises three distinct stages: shear flow-dominated, shear-tension flow transition, and tension flow-dominated. Under optimal parameters, the experimentally measured average orientation function reached 0.941, exhibiting an error of only 1.06% compared to the predicted value. The high orientation function enhanced the composite material’s strength by 157% relative to low-orientation samples, validating the effectiveness of this optimization scheme.