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An Analysis of Die Swell with Rolie-Poly Model

机译:罗伊 - 聚模型的模具膨胀分析

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摘要

Previous efforts on die swell issues mainly focus on linear models such as Oldroyd-B, Linear PTT. However, the characteristic of Rouse Linear Entangled Polymers (Rolie-Poly) model, as a simple model derived from tube-based molecular theory, is rarely discussed before. Compared with other constitutive models, the Rolie-Poly model did a better job in predicting the dynamics of entangled polymer melts problems. In this paper, we analyzed the role of parameters in Rolie-Poly model when determining the behavior of die swell in 2D cases. Results show that the velocity in the die and the shape of the free surface are both totally different from Oldroyd-B model. It seems that the reptation relaxation time plays a dominant role in determining the final result of the extrusion. Moreover, the input velocity might have different influences under different conditions.
机译:以前的模具膨胀问题主要侧重于旧的线性模型,如oldroyd-B,线性PTT。 然而,以前讨论了唤醒线性缠结聚合物(Rolie-Poly)模型的特征,作为一种基于管的分子理论的简单模型。 与其他本构模型相比,Rolie-Poly模型在预测缠结聚合物熔体问题的动态方面做得更好。 在本文中,我们在确定2D案例中的模具膨胀行为时分析了参数在Rolie-Poly模型中的作用。 结果表明,模具中的速度和自由表面的形状完全不同于oldroyd-B型号。 似乎重新放松时间在确定挤出的最终结果时起着主导作用。 此外,输入速度可能在不同条件下具有不同的影响。

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