摘要
以微管为研究对象,采用Bird-Carreau黏度模型,运用有限元分析软件Polyflow,对传统微管挤出和气辅微管挤出成型过程进行了三维等温数值模拟,研究分析了传统微管挤出和气辅微管挤出时的挤出胀大率、速度场、压力场以及剪切速率场。对模拟结果进行了分析和对比,研究结果表明,气辅微管挤出时,挤出胀大基本被消除;口模出口处熔体的速度场均匀一致,剪切速率基本为零;熔体压力比传统微管挤出降低一半。
Taking the microtube as research object, a three-dimensional isothermal numerical simulation of conventional and gas-assisted extrusion processes of microtube was separately performed with Bird-Carreau constitutive equation and the finite element software Polyflow. The die swell ratio, velocity field, stress field and shear rate distribution were analyzed. The simulation results were analyzed and compared. The results showed that for gas-assisted microtube extrusion, the die swell could be almost eliminated; at the die exit, the velocity field of melt was uniform and the shear rate was near zero; the melt pressure decreased by a half compared with that of conventional microtube extrusion.
出处
《塑料工业》
CAS
CSCD
北大核心
2015年第10期44-47,共4页
China Plastics Industry
基金
国家自然科学基金(51163011)
关键词
微管
气辅挤出
挤出胀大
数值模拟
Microtube
Gas-assisted Extrusion
Die Swell
Numerical Simulation
