蜂窝夹层结构真空袋共固化工艺过程实验研究

针对蜂窝夹层板的共固化工艺 , 以玻纤/环氧 648复合材料为面板 , 以 Nomex蜂窝为夹芯材料 , 采用真空袋法研究了树脂流动对胶瘤面积和面板孔隙缺陷的影响 , 并通过平拉强度的测试考察了胶接强度与胶瘤面积之间的关系。结果表明: 胶瘤面积随加压时机的推迟先增大后减小 , 并且下面板/芯材胶瘤面积要大于上面板/芯材胶瘤面积 ; 在树脂黏度变化的不同阶段 , 面板中的孔隙消除机制不同 , 并与密封袋内抽气通路的分布有关。力学测试结果发现 , 胶瘤面积的增大有利于平拉强度的提高 , 但当胶接强度超过蜂窝抗拉强度时 , 平拉强度的测试方法存在局限性。 

Experimental study of the cocure process with the vacuum bag method for honeycomb sandwich structure

By using glass fiber/ epoxy 648 as panel and Nomex honeycomb as core , the effect s of resin flow behavior on the area of fillet and panel quality in the honeycomb sandwich st ructure were investigated with the vacuum bag cocure process , and the relationships between bonding st rength and fillet area were discussed by testingthe flatwise tensile st rength of samples. It is found that the fillet area first increases then decreases as the application time of vacuum is put off . The fillet area between bot tom panel and honeycomb core is larger than that between top panel and honeycomb core. As resin viscosity varies , the mechanisms of porosity elimination change , which can also be influenced by the dist ribution of gas passage in the sealed bag. Moreover , the result s of the mechanical test show that the improvement of flatwise tensile st rength can be achieved by increasing the fillet area. However , if the bonding st rength surpasses the tensile st rength of the honeycomb core , it has limitation to characterize the bonding property by the flatwise tensile st rength.