T型长桁边缘倒角对蒙皮纤维屈曲的影响研究

文 摘 通常在复合材料加筋壁板结构先固化长桁,再将未固化的蒙皮与固化长桁进行共胶接过程中,由于辅助材料的架桥造成长桁边缘处蒙皮局部纤维屈曲。针对此类问题,研究了长桁边缘倒角角度、蒙皮厚度和蒙皮铺层角度3个因素对长桁边缘处蒙皮局部纤维屈曲程度的影响,并对纤维屈曲的原因和机理进行了分析。结果表明：减小倒角角度有利于减小蒙皮局部纤维屈曲的程度,同时纤维屈曲程度与蒙皮厚度呈正相关,与蒙皮铺层中90°铺层比例呈负相关。工程应用中,对长桁边缘适当倒角,在不使用工艺软模的条件下有利于提高复合材料加筋壁板的成型质量。

Study on the Effects of Edge Chamfering of T-type Stringer on Skin Fiber Buckling

Usually, in the process of cured stringer co-bonding with uncured skin for composite stiffened panel, the fiber of the skin at the edge of the stringer flange will be buckling due to the bridging of auxiliary materials. According for these, this article studied that how the angle of chamfering at the edge of the stringer, skin thickness and skin ply angle influence the buckling of fiber in the skin nearing the edge of the stringer flange. The reason and mechanism of fiber buckling also were analyzed. The results show that decreasing the angle of chamfering at the edge of the stringer is beneficial to reduce the buckling degree of skin fiber. At the same time, the fiber buckling degree is positively correlated with the skin thickness, and negatively correlated with the 90 ° ply ratio in the skin ply. In engineering application, proper chamfering of stringer edge is beneficial to improve the forming quality for composite stiffened panel without using the craft soft cover.