Compression moulding of Carbon/PEEK Randomly-Oriented Strands composites: A 2D Finite Element model to predict the squeeze flow behaviour
Compression moulding of Carbon/PEEK Randomly-Oriented Strands composites: A 2D Finite Element model to predict the squeeze flow behaviour
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DOI：
10.1016/j.compositesa.2015.11.006
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发表时间：
2016-02-01
影响因子：
8.7
通讯作者：
Hubert, Pascal
中科院分区：
文献类型：
--
作者：
Picher-Martel, Gilles-Philippe;Levy, Arthur;Hubert, Pascal
预浸渍热塑性复合材料的随机取向股线（ROS）的压缩成型是一种能够在一个单一成型步骤中形成具有肋、厚度变化和孔等特征的复杂部件的工艺。本文着重于宏观挤压流动行为，在成形过程中发生。这种机制规则的复杂功能的模具最初空的填充。建立了ROS复合材料挤压流动的二维有限元模型。该材料被建模为宾汉流体和等效粘度和屈服应力的三个不同的股线尺寸使用逆方法确定。粘度和屈服应力被发现随着股线长度增加。使用碳/PEEK ROS扁平样品进行模型的实验验证，并且对于所有情况，实验测量和预测的最终应变之间的平均差异低于5%。(C)2015爱思唯尔有限公司版权所有。
Compression moulding of Randomly-Oriented Strands (ROS) of pre-impregnated thermoplastic composites is a process that enables the forming of complex parts with features such as ribs, thickness variations and holes in one single moulding step. This paper focuses on the macroscopic squeeze flow behaviour that occurs during forming. This mechanism rules the filling of intricate features of the mould initially empty. A 2D Finite Element model was developed to predict the squeeze flow of ROS composites. The material was modelled as a Bingham fluid and the equivalent viscosity and yield stress of three different strand sizes were determined using an inverse method. The viscosity and yield stress were found to increase with strand length. Experimental validation of the model was performed using Carbon/PEEK ROS flat samples and the average difference between experimentally measured and predicted final strain was below 5% for all cases. (C) 2015 Elsevier Ltd. All rights reserved.