摘要
近几年在树脂膜渗透成型工艺(RFI)的基础上开发出了一种新型的航空复合材料制造工艺:液体树脂灌注成型工艺(LRI,Liquid Resin Infusion)。由于LRI是在一个真空膜下进行的,它不需要特殊的模具,所以大大降低了制造成本,并且用这种工艺可以制出大而厚的复杂部件,但是这也使得我们很难了解到整个工艺过程中内部参数的变化情况。为了指导实际的制造工艺,优化制造方案和参数,并减少制造缺陷,开发和运用有效的数值计算模型就变的非常的必要。最近Celle等人利用有限元方法(FEM)开发出了一种有关LRI的基础数值模型[4,5],本文将要介绍在这种基础模型上开发出的对LRI的数值建模计算方法和它的应用,并与实验结果进行对比和讨论。结果表明:本文所做的数值建模计算结果与实验结果有着较好的一致性,能较为有效地对LRI成型工艺进行模拟计算。
The advanced manufacturing techniques like resin injection （RTM： Resin Transfer Moulding） or infusion （RFI： Resin Film Infusion） which have been intensively studied. In the recent years, another resin infusion processes （LRI： Liquid Resin Infusion） have become more popular for the manufacturing of structural polymer - based composites for aerospace, automotive and others mihtary apphcations. LRI has been identified as a cost- effective alternative to conventional autoclave manufacturing technique. It can produce complex and thick parts with very good mechanical properties and with less waste than traditional methods. However, the process is difficult to control because it is enclosed in a vacuum bag and we haven＇t much inside information, so the numerical simulations of this process should be perfonned to optimize the design and manufaeturing parameters and reduce the defects. A complete model of infusion - based processes has been recently developed with finite element method by Celle et al . It gives the opportunity to develop simulation of real infusion process, so this paper will present a numerical model about the LRI process on this base model of infusion and some numerical validations of it. At last, we will make the first comparison with the experiment results and give our conclusions. The results have shown that the numerical simulation is in good accordance with the experiment. It can be considered that tiffs numerical model is able to simulate the LRI filling stage efficiently in the industrial condition.
出处
《纤维复合材料》
CAS
2008年第4期19-23,39,共6页
Fiber Composites
