吸胶膜对复合材料构件固化过程中树脂流动行为的影响

热固性树脂基复合材料构件成型过程中的树脂流动行为决定了其最终成型后的纤维体积分布情况,严重影响构件的最终成型质量。而吸胶膜作为预浸料中的多余树脂流出构件后的吸收载体,其材料特性对树脂的流动过程起主导作用。以吸胶膜为关注重点,基于AS4/3501-6复合材料体系,建立了厚截面复合材料构件在热压罐中固化压实的仿真模型,模型包括了固化反应、热传导和紧密压实三个模块。模型与实验中构件的压实情况对比,验证模型的可行性。通过模型计算结果研究了吸胶膜的孔隙率、渗透率及厚度等关键参数在压力、温度等工艺条件的协同作用下对树脂流动行为的影响规律。结果表明:吸胶膜的孔隙率和厚度作为吸收树脂载体的空间度量,对构件的最终压实厚度起主要作用;吸胶膜的渗透率通过树脂流动速度影响固化压实过程,渗透率过小时,构件的压实厚度明显减小。

INFLUENCE OF THE BLEEDERS ON THE RESIN FLOW DURING THE CONSOLIDATION OF RESIN MATRIX COMPOSITE STRUCTURES

The flow behavior of resin in the process of forming thermoset resin composites determines the volume distribution of the fiber after the final forming,which seriously affects the final forming quality of the components.As the absorption carrier of the excess resin in the prepreg,the material properties of the bleeder play an important role in the flow of the resin.Focusing on the bleeder,a simulation model is established for the consolidation and compaction of thick section composites in autoclave based on the AS4/3501-6 composite system.It contains solidification reaction module,heat conduction module and compaction module.Compared with the experiment data,the feasibility of the model was verified.The influence of the key parameters including porosity,permeability,and thickness on the flow of the resin under the synergistic action of pressure and temperature was studied by the simulation model.The results show that as the spatial measurement of the absorption resin cartier,the porosity and the thickness of the bleeder play a major role in the final compaction thickness of the composite laminates.The permeability of the bleeder influences the compaction by changing the resin flow rate.And,if the permeability is too small,the compaction thickness of the composite laminates would be decreased obviously.