Residual normal force after cessation of squeezing flow of liquid crystalline polymers
Residual normal force after cessation of squeezing flow of liquid crystalline polymers
复制标题
液晶聚合物挤压流动停止后的残余法向力
DOI：
10.1122/1.550795
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
A. Rey
中科院分区：
文献类型：
--
作者：
A. Rey
利用经典液晶理论建立了一个计算液晶聚合物的法向力和剪切扭矩的模型。将该模型应用于平行圆盘几何结构，计算了三个具有代表性的平均分子取向的法向力。结果发现，当取向受到扭转变形时，总是存在一个倾向于分离平行圆盘的正法向力。对于典型的参数值和几何形状，该模型预测法向力比剪切扭矩大六个数量级。用Langelaan和Gotsis(1996)的实验数据对模型预测进行了验证。
Classical liquid crystal theories are used to develop a model to compute the normal forces and shear torques for liquid crystalline polymers. The model is applied to the parallel disk geometry and the normal forces from three representative average molecular orientations are computed. It is found that a positive normal force tending to separate the parallel disks will always be present whenever the orientation is subjected to a twisting deformation. For typical parameter values and geometries, the model predicts that normal forces are six orders of magnitude larger than shear torques. The model predictions are validated with the experimental data presented by Langelaan and Gotsis (1996).