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On the Influence of Viscoelastic Modeling in Fluid Flow Simulations of Gum Acrylonitrile Butadiene Rubber

机译：粘弹性型胶水模拟粘弹性模拟对胶丙烯腈丁二烯橡胶的影响

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Computational fluid dynamics (CFD) simulation is an important tool as it enables engineers to study different design options without a time-consuming experimental workload. However, the prediction accuracy of any CFD simulation depends upon the set boundary conditions and upon the applied rheological constitutive equation. In the present study the viscoelastic nature of an unfilled gum acrylonitrile butadiene rubber (NBR) is considered by applying the integral and time-dependent Kaye–Bernstein–Kearsley–Zapas (K-BKZ) rheological model. First, exhaustive testing is carried out in the linear viscoelastic (LVE) and non-LVE deformation range including small amplitude oscillatory shear (SAOS) as well as high pressure capillary rheometer (HPCR) tests. Next, three abrupt capillary dies and one tapered orifice die are modeled in Ansys POLYFLOW. The pressure prediction accuracy of the K-BKZ/Wagner model was found to be excellent and insensitive to the applied normal force in SAOS testing as well as to the relation of first and second normal stress differences, provided that damping parameters are fitted to steady-state rheological data. Moreover, the crucial importance of viscoelastic modeling is proven for rubber materials, as two generalized Newtonian fluid (GNF) flow models severely underestimate measured pressure data, especially in contraction flow-dominated geometries.
机译：计算流体动力学（CFD）仿真是一个重要的工具，使工程师能够在没有耗时的实验工作量的情况下研究不同的设计选项。然而，任何CFD模拟的预测准确性取决于设定边界条件和所施加的流变结构术方程。在本研究中，通过施加积分和时间依赖的Kaye-Bernstein-Kearsley-Zapas（K-BKZ）流变模型，考虑未填充的口香糖丙烯腈丁二烯橡胶（NBR）的粘弹性。首先，在线性粘弹性（LVE）和非LVE变形范围内进行详尽的测试，包括小振幅振荡剪切（SAOS）以及高压毛细管流变仪（HPCR）测试。接下来，在ANSYS Polyflow中建模了三个突然的毛细管模具和一个锥形孔模具。发现K-BKZ / WAGNER模型的压力预测精度对SAOS测试中的施加的法向力以及第一和第二正常应力差异的关系非常敏感，并且只要阻尼参数安装在稳定 - 状态流变数据。此外，橡胶材料证明了粘弹性建模的关键重要性，因为两个广义牛顿液（GNF）流体模型严重低估了测量的压力数据，尤其是在收缩束缚的几何形状中。

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