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建立了织物预成型体单胞内纱线间细观流动和纱线内部微观流动的统一的数学模型。基于最小势能原理建立了织物松弛状态下的单胞几何模型,同时对在模具压缩下的单胞变形进行了分析,并建立了不同压缩状态下的单胞几何模型。通过对单胞内树脂流动数学模型的数值求解,获得了流动速度场及压力场,进而预测了预成型体的渗透率。预测1组不同压缩状态下的单胞渗透率,研究了预成型体压缩变形对渗透率的影响。结果显示:随着压缩量的增加,其渗透率逐渐降低。通过实验测量及数据分析,验证了建模和预测方法的正确性。
A unified mathematical model was established for the microscopic flow in the unicellular fabric and the microscopic flow in the yarn. Based on the principle of minimum potential energy, the cell geometry model in the relaxed state of the fabric was established, and the cell deformation under the compression of the die was analyzed. The cell geometry model under different compression states was also established. Through the numerical solution of the intramolecular resin flow mathematical model, the flow velocity field and pressure field are obtained, and then the permeability of the preform is predicted. The single cell permeability under different compression states was predicted, and the effect of preform compression deformation on permeability was studied. The results show that as the amount of compression increases, the permeability decreases. Through the experimental measurement and data analysis, the correctness of the modeling and forecasting methods is verified.