湿热环境对蜂窝夹层复合材料性能的影响

Effects of Hygrothermal Environment on Properties of Nomex Sandwich Composite

对不同类型的Nomex蜂窝夹层复合材料进行湿热处理,分别测定不同材料的吸湿曲线与材料处理前后的力学性能与介电性能。实验结果表明:不同材料具有不同的吸湿特性。湿热环境会对夹层复合材料试样的面板强度、芯材剪切与压缩强度造成不同程度的负面影响,通过比较,在力学性能方面,两种面板材料的耐湿热性能相似,而环氧/NH-1-72材料的芯材具有更好的耐湿热性能。同时,湿热环境会对不同材料的介电性能产生不同的影响,其中,环氧/NH-1-48材料因其具有的最低的芯材密度,而具有最好的介电性能耐湿热性。

After conditioning in the hygrothermal environment,the moisture absorbing plot was recorded and mechanical and dielectric properties of different kinds of Nomex sandwich structure composites were investigated in the dry and wet conditions.The results show that different samples had distinct moisture absorbing performance in the hygrothermal environment.And the hygrothermal circumstance will bring negative effects on the mechanical properties of the sandwich structure facing and core.After comparing among these materials,two kinds of facings have the similar moisture absorbing properties,and the epoxy/NH-1-72 composite has the relatively better conditioning resistance performances in the mechanical aspect.In addition,the hygrothermal environment will also decrease the dielectric properties of the sandwich structure,and the epoxy/NH-1-48 sample has the best dielectric properties conditioning resistance for its lowest core density.