Interstrand void content evolution in compression moulding of randomly oriented strands (ROS) of thermoplastic composites
Interstrand void content evolution in compression moulding of randomly oriented strands (ROS) of thermoplastic composites
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DOI：
10.1016/j.compositesa.2014.11.017
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发表时间：
2015-03-01
影响因子：
8.7
通讯作者：
Hubert, Pascal
中科院分区：
文献类型：
--
作者：
Levy, Arthur;Hubert, Pascal
热塑性复合材料的无规取向股线（ROS）的压缩成型是一种能够形成复杂形状并保持最终性能接近连续纤维复合材料的工艺。在形成过程中，发生几种变形机制。在本文中，我们专注于股间空隙含量（ISVC）的减少：在压缩过程中，每个单股的挤压，使股之间的间隙填充。这种变形机制的建模。压实是由一个常微分方程，数值求解。该模型进行了实验验证，使用仪器热压与碳PEEK预浸料股。该模型准确地预测ISVC在四个特征的情况下。使用该模型，几个工艺和材料参数的影响进行了研究。最后，给出了一个设计图表，给出了在压力、铸坯几何形状和零件厚度范围内的最终ISVC。(C)2014爱思唯尔有限公司版权所有。
Compression moulding of randomly oriented strands (ROS) of thermoplastic composite is a process that enables the forming of complex shapes with keeping final properties close to that of continuous fibre composites. During forming several deformation mechanisms occur. In this paper we focus on the interstrand void content (ISVC) reduction: the squeezing of each single strand during compression enables filling of the gaps between strands. A modelling of this deformation mechanism was developed. The compaction is ruled by an ordinary differential equation that was solved numerically. The model was validated experimentally using an instrumented hot press with Carbon-PEEK prepreg strands. The model accurately predicted ISVC in four characteristic cases. Using the proposed model, the influence of several process and material parameters were investigated. Finally, a design chart giving the final ISVC for a wide range of pressure, strand geometry and part thickness, was constructed. (C) 2014 Elsevier Ltd. All rights reserved.