T形加筋板热压罐成型过程压力分布与树脂流动实验研究

Experimental research on pressure distribution and resin flow of T-stiffened skins in autoclave process

针对飞行器复合材料常用加筋板结构,采用胶接共固化整体工艺成型T形加筋板。采用自行建立的压力测试方法测试了T形加筋板在热压罐成型过程的压力分布,通过吸胶量、筋条厚度的检测,分析了树脂在筋条内的流动形式,研究了树脂流动的影响因素及影响规律。结果表明:筋条不同部位明显存在压力分布不均,在压力差作用下树脂发生明显的面内流动,易产生富脂、厚度不均等缺陷,导致筋条拐角较厚,约是突缘和腹板厚度的1.11.4倍,模具组合方案、曲率半径、填充料含量明显影响树脂面内流动和纤维密实程度。

T-stiffened skins widely used in aircraft industry nowadays were fabricated by integral molding technology of co-bonding in autoclave.A method of self-designed solid pressure testing was introduced to measure the pressure distribution in the T-stiffeners during fabrication.The resin flow and fiber compaction of T-stiffened skins were investigated by analyzing the bleeding quantity and stiffener thickness.The results indicate that the presence of significant resin flow in plane is induced by pressure difference distributing in the various zones of the stiffeners,which results in some manufacturing defects of rich resin and non-uniform thickness in the corner section of stiffeners.The ratios of the thickness of the corner to the web and to the flange are almost in the range of 1.1-1.4.Moreover,the resin flow and fiber compaction are remarkably influenced by tool assembly schemes,curvature radii and fillers.