RSC模型中相互作用系数和标量因子对短纤维取向的影响

Influence of Interaction Coefficient and Scalar Factor in RSC Model on Orientation of Short Fiber

为预测注塑成型中短纤维取向分布,提出了在模拟分析中采用RSC纤维取向预测模型对纤维取向分布进行预测的方法。基于RSC取向模型,通过第二顺序张量aij对三维取向分辨率进行描述,采用Orthotropic闭合近似模型对RSC模型进行求解。采用MoldFlow软件对RSC模型的纤维取向分布进行了模拟,分析了相互作用系数Ci及标量因子k对纤维取向的影响。并获得了纤维取向随空间、时间的取向规律——沿宽度方向,两端面的取向要大于中心层,并且端面在开始阶段就能达到很高的纤维取向;沿流动方向,在浇口及充填末端,纤维取向都呈下降趋势,而中间部分则有所增加。

In order to predict the orientation distribution of short fiber in injection molding, a simulation by using reduce strain closure （RSC ）model to predict fiber orientation was proposed. Based on RSC model, the three dimensional orientation resolution was described by a second order orientation tensor aij, and the fourth order orientation tensor was replaced by Orthotropic closure approximation. After that, the Moldflow software was used to simulate fiber orientation distribution. The effect of interaction coefficient Ci and scalar factor k on fiber orientation was investigated, and the orientation distribution with the time and space was discussed. The results indicate that along the width direction, the degree of orientation in end surface is higher than that in center, and a large fiber orientation is achieved at the beginning of filling; along the flow direction, the fiber orientation shows a trend of decline at the location of gate and end of filling.