固化循环热历程对芳纶纸蜂窝芯材尺寸收缩的影响  

Effect of curing circulation thermal history on dimensional shrinkage of aramid paper honeycomb core materials

作　　者：骆严 刘宇婷 孔娇月 LUO Yan;LIU Yuting;KONG Jiaoyue(Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201314,China)

机构地区：[1]上海飞机制造有限公司,上海201314

出　　处：《工程塑料应用》2024年第10期84-90,共7页Engineering Plastics Application

摘　　要：在芳纶纸蜂窝夹芯结构的修理过程中,需对蜂窝零件进行多次加热固化,这可能会导致蜂窝芯材的尺寸收缩,从而导致零部件产生凹陷。因此,有必要研究固化循环热历程对芳纶纸蜂窝芯材尺寸收缩的影响规律,为飞机复合材料芳纶纸蜂窝夹芯结构的修理填补方案提供参考依据。研究了不同修理固化温度及固化循环次数对国产及国外几种芳纶纸蜂窝芯材尺寸收缩的影响。通过对每次固化后的蜂窝芯材尺寸进行测试,探究蜂窝芯材的收缩规律。结果表明,经中高温(121℃)和高温(177℃)下修理固化循环多次后,国产与国外的蜂窝芯材的尺寸收缩程度均明显高于经中低温(93℃)和低温(66℃)固化加热循环后的收缩程度;经5次修理加热循环后,几种蜂窝芯材的尺寸收缩程度均明显高于第1次修理固化后的收缩程度;对于相同厚度的国产和国外蜂窝芯材,经多次固化循环后,国产蜂窝芯材的收缩程度更低。总体而言,芳纶纸蜂窝芯材在常见修理温度下多次热历程循环后,蜂窝芯材加热后的收缩程度较小,具有良好的尺寸稳定性,能够较好地满足蜂窝夹芯结构多次修理填补的需求。In the process of repairing the aramid paper honeycomb core materials,the honeycomb parts need to be heated and cured many times,which may lead to the dimensional shrinkage of the honeycomb core,resulting in a dent in the parts.Therefore,it is necessary to study the influence of curing circulation thermal history on the dimensional shrinkage of aramid paper honeycomb corematerials,so as to provide reference for the repair and filling scheme of aircraft composite aramid paper honeycomb sandwich structure.The effects of various repaired curing temperature and recirculating heating frequency on dimensional shrinkage of domestic and foreign aramid paper honeycomb core materials were investigated.By measuring the size of honeycomb core materials after each solidification,the shrinkage rule of honeycomb core material was explored.The results indicate that the dimensional shrinkage degree of honeycomb core materials is significantly higher after repeated curing circulation under high(177℃)and middle-high(121℃)temperature conditions than that under low(66℃)and middle-low(93℃)temperature circumstances.After 5 times of repaired heating circulation,the dimensional shrinkage degrees of these honeycomb core materials are relatively higher than that of 1st heating.For domestic and foreign honeycomb core materials with the same thickness,the shrinkage degree of domestic honeycomb core materials is lower after multiple curing cycles.In general,the dimensional shrinkage degree of these aramid paper honeycomb core materials used is low after multiple thermal history circulation,has good dimensional stability,can better meet the need of honeycomb sandwich structure multiple repair and filling.

关 键 词：固化循环 芳纶纸蜂窝芯 尺寸收缩 航空应用 热历程 

分 类 号：TB332[一般工业技术—材料科学与工程]