蜂窝夹层结构自动铺丝工艺试验研究与优化

Experimental Study and Optimization of Automated Fiber Placement for Honeycomb Sandwich Structures

夹层结构的自动铺丝存在蜂窝塌陷、倒角处架桥、铺丝头与蜂窝干涉碰撞等问题。为了解决以上问题,对蜂窝夹层结构的自动铺丝工艺进行了研究,包括材料加热参数、压实力的选择,铺放路径的仿真规划,蜂窝芯材的台阶设计,以及蜂窝极限边角等。对蜂窝夹层结构的铺丝路径进行了设计并实际铺放,对铺放过程的缺陷及其产生原因进行了分析,并得到优化验证。研究发现加热参数会影响预浸料的铺贴性,温度过高会使预浸料灼伤。为保证铺贴质量,蜂窝倒角不宜超过30°,并且蜂窝与底面需平滑过渡,最后蜂窝的位置需与设计严格一致。

There are some phenomena happen for automated fiber placement of sandwich structures,such as the honeycomb is prone to crush due to the compression of head,the bridge at the interface between the honeycomb and the bottom,the head contact with the honeycomb,etc.To solve the above problems,the automated fiber placement for honeycomb structures were investigated,which included the heating parameters and the compression force,the simulation of the placement,the stage of the honeycomb core,and the limit angle of the honeycomb,etc.The fiber placement path of sandwich structures were designed and the sandwich structures were manufactured,meanwhile the defects during the process were classified and analyzed,and solved experimentally.The investigation shows that the heating parameter would affect the layup ability of the prepreg,overheating can burn the prepreg.To assure the layup quality,the angle of the honeycomb is better to be less than30degree,and the honeycomb has a smooth connection with the bottom,the last but not the least,the size and the position of the honeycomb is crucial for the process quality.