摘要
使用牛顿流体模型与微分黏弹模型分别对双层聚合物共挤出过程进行了流变模型建模与仿真,得到了两路熔体流动的流变趋势与二维有限元模型.模拟结果表明:共挤过程中两路熔体在交界面处保持连续稳定流动,所受剪切应力相等,最终达到流率平衡.利用微分黏弹Oldroyd-B模型分析了共挤出过程聚合物的挤出胀大效应,可知在两路熔体体积流率逐渐增加时,共挤物的挤出形态也发生了对应偏转变化.微分黏弹模型相比普通牛顿流体模型可更好地反映聚合物共挤出加工过程中熔体的流变特性.
In order to obtain the rheological trend and two dimensional finite element model of two way melt flow,rheological modeling and simulation for two layer polymer co-extrusion process using Newton fluid model and differential viscoelastic model respectively. Examining the simulation results,in the co-extrusion process the two melt flow path keep continuous and stable flow in the interface,the shear stress of two melt flow path are equal and ultimately the flow rate achieved balance. It can be known analyzing the die swell effect of polymer co-extrusion process by differential viscoelastic Oldroyd-B model,the melt volume flow rate of two melt flow path gradually increased,the co-extrusion material extrusion shape also gradually deflected changed. Compared with ordinary Newton fluid model,the rheological properties of polymer melt during extrusion process of polymer can be better reflected by differential viscoelastic model.
出处
《中南民族大学学报（自然科学版）》
CAS
北大核心
2015年第4期98-102,共5页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
国家自然科学基金资助项目(51403160)
