| 复合共挤成型中挤出胀大的三维粘弹数值模拟 |
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| 引用本文： | 黄益宾,柳和生,黄兴元,赖家美.复合共挤成型中挤出胀大的三维粘弹数值模拟[J].高分子材料科学与工程,2010(3):160-163. |
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| 作者姓名： | 黄益宾 柳和生 黄兴元 赖家美 |
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| 作者单位： | 南昌大学聚合物成型研究室; |
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| 基金项目： | 国家自然科学基金资助项目(20664002,50273012);;2007年度教育部科学技术研究重点项目;;江西省自然科学基金资助项目(0620033);;2006江西省教育厅科技项目 |
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| 摘 要： | 采用Phan-Thien and Tanner(PTT)本构方程,建立了矩形截面共挤口模内外两种聚合物熔体流动的三维粘弹数值模型,有限元模拟了聚丙烯/聚苯乙烯(PP/PS)共挤过程中的挤出胀大现象,并用实验验证了模拟结果。研究表明:当入口体积流量相同时,两熔体挤出口模后会朝向黏度较高的PS熔体一侧偏转,型材截面呈非对称畸变。两熔体在垂直挤出方向上的速度分布导致了挤出胀大过程中熔体的偏转流动,而口模出口处的剪切速率分布基本决定了共挤型材截面的形状。实验结果与模拟结果基本相符,模拟所得挤出胀大率比实际值大8.6%。等温假设是影响共挤出胀大数值模拟准确度的主要因素。
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| 关 键 词： | 共挤成型 挤出胀大 有限元 三维粘弹模拟 PTT本构方程 |
Three-Dimensional Viscoelastic Simulation of the Die Swell in Coextrusion Process |
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| HUANG Yi-bin,LIU He-sheng,HUANG Xing-yuan,LAI Jia-mei.Three-Dimensional Viscoelastic Simulation of the Die Swell in Coextrusion Process[J].Polymer Materials Science & Engineering,2010(3):160-163. |
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| Authors: | HUANG Yi-bin LIU He-sheng HUANG Xing-yuan LAI Jia-mei |
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| Affiliation: | Polymer Processing Research Laboratory;Nanchang University;Nanchang 330031;China |
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| Abstract: | A three-dimensional viscoelastic numerical model with Phan-Thien and Tanner(PTT)constitutive equation was established for the flow of two polymer melts inside and outside a coextrusion die with rectangular shaped cross-section,the die swell of the polypropylene/polystyrene(PP/PS)melts were simulated through finite element method,and the results were verified by experiments.The study shows that the melts with same inlet volume flow rates flow with a deflection towards the PS side and the cross-section presen... |
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| Keywords: | coextrusion die swell finite element three-dimensional viscoelastic simulation PTT constitutive equation |
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