Modeling of heat transfer and unsaturated flow in woven fiber reinforcements during direct injection-pultrusion process of thermoplastic composites
Modeling of heat transfer and unsaturated flow in woven fiber reinforcements during direct injection-pultrusion process of thermoplastic composites
复制标题
DOI：
10.1016/j.compositesa.2015.04.017
复制
发表时间：
2015-10-01
影响因子：
8.7
通讯作者：
Orange, Gilles
中科院分区：
文献类型：
--
作者：
Babeau, Arthur;Comas-Cardona, Sebastien;Orange, Gilles
本文提供了一种热塑性塑料直接注射造粒过程中传热和聚合物流动的模拟方法。纸浆最初是用具有低粘度的热固性材料开发的。但是，对于表现出较高粘度的热塑性塑料，浸渍成为一个关键点。关于在模具内注射直接热塑性塑料浸渍的报道很少。此外，罕见的研究还没有充分解决编织纤维增强材料中的非饱和流动问题。这里提出的解决方案，模拟聚合物流经双尺度多孔介质。将热传递模型耦合到富含汇项的流动模型。进行变量的特定改变，以便沿着连续过程模拟不饱和度的稳态解。在连续性方程中加入吸收项，表示聚合物被纤维束吸收的速率。在纸浆生产线上测量数据，显微照片证实了采用不饱和流动方法的建模策略。耦合到热塑性塑浆工艺的热传递的流动建模旨在确定通过模具的饱和度演变，以便制造具有最低残余孔隙率的拉挤型材。(C)2015爱思唯尔有限公司版权所有。
This paper provides a methodology for the modeling of heat transfer and polymer flow during direct thermoplastic injection pultrusion process. Pultrusion was initially developed with thermosets which have low viscosity. But the impregnation becomes a critical point with thermoplastics which exhibit higher viscosity. There are very few reported works on direct thermoplastic impregnation with injection within the die. In addition, the rare studies have not adequately addressed the issue of unsaturated flow in woven fiber reinforcements. The solution proposed here, models the polymer flow through dual-scale porous media. A heat transfer model is coupled to a flow model enriched with a sink term. Specific changes of variables are made so as to model the steady state solution of unsaturation along a continuous process. The sink term, added to the continuity equation, represents the absorption rate of polymer by the bundles. Data were measured on a pultrusion line and micrographs confirmed the modeling strategy with an unsaturated flow approach. The flow modeling coupled to heat transfer of the thermoplastic pultrusion process aims at determining the saturation evolution through the die so as to manufacture pultruded profiles with the lowest residual porosity. (C) 2015 Elsevier Ltd. All rights reserved.