干铺丝预制体的液体成型工艺研究

为解决RTM类成型工艺中的预制体制备及定型问题,在国内率先开展对干铺丝-液体成型工艺的研究,主要研究内容为液体成型过程工艺参数影响机制及制件的力学性能。采用单因素法确定液体成型时预制体粘结剂含量、注胶温度、充模时间的影响机制,再通过正交法确定了最佳工艺组合,最后就层间剪切与弯曲性能与模压工艺进行比较。实验结果表明,液体成型过程中,树脂的流动充模会受到工艺参数不同程度的影响,注胶温度的影响最大,充模时间影响甚微,通过正确的工艺组合可以减少孔隙等缺陷,保证复合材料的内部质量。力学性能测试表明,干铺丝-液体成型工艺的力学性能水准与模压工艺持平,其中弯曲强度略有降低。

STUDY ON THE LIQUID FORMING PROCESS OF DRY-FIBER PREFORM

In order to solve the problem of preparation and setting of preform in RTM process,the dry fiber-liquid forming process was first studied domestically in this article.The main content was the influence mechanism of process parameters and the mechanical properties of liquid-forming process.Method of single factor was used to determine the influence of binder content,injection temperature and filling time on liquid forming.Then,the combination of optimum process was determined by orthogonal method.Finally,the inter-laminar shear and bending properties were compared with molding process.The experimental results show the flow filling of resin will be affected by the process parameter.The influence of injection temperature is the greatest,and the filling time has little effect.The correct combination of process can reduce defects such as pores to ensure the internal quality of composite.The mechanical tests show that the mechanical properties of the dry fiber-liquid forming process were equal to molding process,and the bending strength is slightly reduced.