微-细双尺度单胞下织物预成型体渗透率预测

建立了描述双尺度单胞内树脂流动的数学模型,基于最小势能原理建立了织物单胞逼近真实的几何模型。研究了由纱线卷曲和相互挤压引起的微观渗透率分布的不均匀性及其在流动求解上的处理方法; 基于有限差分法建立了树脂流动控制方程数值求解方法,并开发了相应软件包,求得了单胞内树脂流动压力和速度场,进而获得了渗透率预测值; 通过与文献预测数据和实验值对比,证明了本文中预测模型和求解方法的正确性。

Permeability prediction for textile preform with micro-meso dual-scale unit cell

A mathematical model for resin flow was established, the geometry model close to the real unit cell structure was built based on the principle of minimum potential energy. The influence of yarn crimp and extrusion on micro-permeability was studied and the numerical method for solving the resin flow control equations based on finite difference method was built, the pressure and velocity distribution of the flow were computed to predict the permeability of preform. The prediction results were compared with literature and experimental values to verify the prediction model and the solving method mentioned above.