夹层结构斜削区蜂窝滑移机理及改善研究

Research on the mechanism and improvement methods of honeycomb slide in the chamfer of sandwich structure

基于蜂窝夹层结构固化原理分析和蜂窝在180℃高温下的力学性能分析,构建了蜂窝滑移受力模型,确定了影响蜂窝滑移的4个关键因素,分别为蜂窝侧向抗压能力、层间摩擦系数、蜂窝芯边缘倒角和固化压差。针对关键因素进一步分析,表明分别影响4个关键因素的子因素及其影响作用。同时提出了抑制蜂窝滑移的有效措施:1)最靠近蜂窝芯的铺层(推荐0/90°织物)延伸至零件边缘以便进行外力(防滑带、玻璃纤维等)拴系;2)工艺手段(浸胶法、胶膜法、隔膜法等稳定化方法)提高蜂窝侧向抗压能力。

Based on the analysis of cocuring principle of honeycomb sandwich structure and mechanical properties of honeycomb at 180℃,a force model for honeycomb slide is established,and four key factors affecting honeycomb slide are determined,namely the lateral compressive capacity of honeycomb,inter-layer friction coefficient,angle of core chamfer,and cocuring pressure difference.Further analysis of these key factors reveals the sub factors that affect the four key factors and represent their respective roles.At the same time,the effective measures to restrain the slide of honeycomb are put forward as follows:1)the layer closest to the honeycomb core(0/90°fabric is better)is recommended to extended to the edge of the part so as to use grit strip,fiberglass tiedown,etc.;2)improving the lateral stiffness of honeycomb by the core stabilization methods such as impregnation method,adhesive film method,and septum method.