Simulating the effect of temperature elevation on clamping force requirements during rigid-tool Liquid Composite Moulding processes
Simulating the effect of temperature elevation on clamping force requirements during rigid-tool Liquid Composite Moulding processes
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DOI：
10.1016/j.compositesa.2012.08.003
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发表时间：
2012-12
影响因子：
8.7
通讯作者：
Abhishek Gupta;P. Kelly;S. Bickerton;W. Walbran
中科院分区：
文献类型：
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作者：
Abhishek Gupta;P. Kelly;S. Bickerton;W. Walbran
用于刚性工具液体复合成型（LCM）工艺的模具，即树脂传递成型（RTM）和压缩RTM，经常受到由于树脂注射和纤维增强物压实而产生的巨大内力。适当的夹紧设备（如压力机或周长夹）是必要的，以平衡这些力。这种夹紧设备的最佳选择（或设计）要求对所产生的工装力进行准确的预测。这项工作的目的是介绍一个全面的数值方案，解决这一问题，包括非等温模具填充的情况。采用有限元/有限差分（FE/FD）混合方法求解流动/能量/物种耦合方程。为了在保持求解精度的同时降低计算复杂度，在仿真算法中实现了一种新的纤维压缩模型。对平面轴对称零件的力预测表明，模具和树脂温度的选择组合以及其他工艺变量在保证快速填充时间的同时保持低成本方面起着至关重要的作用。
Moulds used for rigid-tool Liquid Composite Moulding (LCM) processes, namely Resin Transfer Moulding (RTM) and Compression RTM, are often subjected to large internal forces which originate due to resin injection and from the compaction of fibre reinforcements. Appropriate clamping equipment (e.g. press or perimeter clamps) is necessary to equilibrate these forces. An optimal selection (or design) of such clamping equipment calls for an accurate prediction of the tooling forces generated. This work aims to introduce a comprehensive numerical scheme which addresses this issue, including the case of non-isothermal mould filling. A hybrid Finite Element/Finite Difference (FE/FD) methodology is utilised for solving the coupled flow/energy/species equations. A new fibre compaction model, developed in order to reduce computational complexity while maintaining solution accuracy, is implemented into the simulation algorithm. The force predictions obtained for a planar axisymmetric part reveal that the chosen combination of mould and resin temperatures, together with other process variables, plays a crucial role in allowing fast fill times while keeping setup costs low.