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中文摘要：
采用有限元方法模拟了非牛顿流体在共挤出过程中的挤出胀大现象，分析了模具流道收敛角、模具内壁的表面质量以及平直段长度对共挤出聚合物挤出胀大的影响。结果表明：当流道收敛角α在0°～30°区间变化时，角度的大小对两种熔体的挤出胀大率均有一定的影响；当30°≤α≤90°时，角度的变化对熔体挤出胀大率几乎没有影响。模具内壁的表面质量对挤出胀大率影响较大，改善模具壁面质量可以有效地减小挤出胀大率。适当增加流道出口平直段长度可以显著减小挤出胀大率。
英文摘要：
The die swell phenomena of isothermal non-Newtonian polymeric sion processes were simulated by means of the finite element method. The effects of such variables as convergence angle, surface quality of die walls and length of straight zone at die exit on die swell and interlace shape were analyzed. The result shows that the die swell ratio of two fluids changes a little, as the convergence angle ranges between 0° and 30°. While the convergence angle ranges between 30° and 90°, the die swell ratios hardly have any difference. The surface quality of die walls affects the die swell obviously. Improving the surface quality of the die walls can reduce the die swell ratio efficiently. The straight zone at die exit is helpful for reducing the die swell. It is necessary to design an appropriate length of the straight zone.
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