配套材料和环境条件对玻纤预浸料/Nomex蜂窝夹层板力学性能的影响

Effects of Supporting Materials and Environmental Conditions on Mechanical Properties of Glass Fiber Prepreg/Nomex Honeycomb Sandwich Panels

通过热压罐成型的工艺方法,将SW100A/AC319环氧树脂基玻璃纤维复合材料预浸料与Nomex芳纶纸蜂窝、J-95中温固化改性环氧膜状结构胶和SY-24C中温固化环氧胶膜及J-47D2改性环氧粉状发泡胶等配套材料制备了4种夹层板。分析了J-95膜状结构胶、SY-24C胶膜和Nomex蜂窝格内填充J-47D2发泡胶对夹层板力学性能的影响,并重点研究了夹层板在常温干态(RTD)、低温干态(CTD)、高温干态(ETD)和高温湿态(ETW)试验环境条件下力学性能的变化。结果表明,分别采用J-95膜状结构胶和SY-24C胶膜胶接制备的夹层板S1和S2,在RTD条件下,各项力学性能无明显差异,在ETD条件下,两者的平压强度、剪切强度和弯曲性能呈现下降趋势。Nomex蜂窝格内填充J-47D2发泡胶可显著提高夹层板力学性能,在ETD条件下,填充J-47D2发泡胶的夹层板各项力学性能较RTD条件下显著下降,在ETW条件下,试样经湿热处理,其力学性能进一步下降。

Four sandwich plates were prepared from SW100A/AC319 epoxy resin based glass fiber composite prepreg,Nomex aramid paper honeycomb,J-95 medium temperature curing epoxy film structural adhesive,SY-24C medium temperature curing epoxy film and J-47D2 modified epoxy foam adhesive by autoclaving process.The effects of J-95 epoxy film structural adhesive,SY-24C film and Nomex honeycomb lattice filled J-47D2 foam adhesive on the mechanical properties of sandwich plate were analyzed,and the mechanical properties of sandwich panels were studied under four experimental conditions:room temperature dry state(RTD),cold temperature dry state(CTD),elevated temperature dry state(ETD)and elevated temperature wet state(ETW).The results show that the mechanical properties of S1 and S2 sandwich plates prepared by using J-95 epoxy film structural adhesive and SY24C modified epoxy film are not significantly different under RTD test condition,but the flatwise compression strength,shear strength and flexural properties of S1 and S2 sandwich panels show a downward trend under ETD test condition.The mechanical properties of sandwich panel filled J-47D2 foam adhesive can be significantly improved.Compared with the RTD condition,the mechanical properties of the sandwich plate filled with J-47D2 foam adhesive decrease significantly under the ETD test condition,and under the ETW test condition,the mechanical properties of the sample further decrease after wet heat treatment.