黏弹阻尼层共固化复合材料不同温度下的阻尼性能

采用共固化工艺制备了以丁腈橡胶为黏弹性阻尼层的复合材料 , 应用动态机械分析仪(DMA)测定了该材料损耗因子的温度谱 , 并对不同温度环境下该材料的阻尼性能和阻尼机制进行了分析。结果表明 : 当温度处于阻尼层玻璃态和高弹态区时 , 共固化复合材料损耗因子较小且随温度变化不大 ; 当温度处于阻尼层黏流态区时 ,共固化复合材料的损耗因子迅速增加到最大值后变小 , 最大损耗因子为 19. 2 % , 约为未插入黏弹阻尼层复合材料的 13倍; 共固化过程中阻尼层损耗因子的减小 , 使共固化复合材料的阻尼性能降低 , 并在阻尼层的黏流态区其损耗因子明显小于预报结果 ; 界面阻尼的影响提高了共固化复合材料的阻尼性能 , 并在阻尼层的玻璃态区其损耗因子大于预报结果。 

Damping properties of cocured composites with interleaved viscoelastic damping layers at different temperatures

The composite with interleaved acrylonit rile butadiene rubber (NBR) layer was fabricated by the co2 curing process. The temperature spect rum of loss factor for the composite were tested using dynamic mechanical analysis (DMA) equipment . The damping properties and damping mechanism of the composite were investigated at different temperatures. The result indicates that the loss factor of the composite is small and almost invariant with temperature when the temperature is within an elastomeric state and glassy state of the damping layer . The loss factor increases to the peak value and then decreases rapidly when the temperature is within a viscous state of the damping layer . The max loss factor of composites with interleaved damping layer is 19. 2 % and is about 13 times of the composite without interleaved damping layer . The damping properties of the cocured composite decrease with the decrease of the loss factor of the damping layer during the cocurig process , and the loss factor by DMA is less than that by prediction in the viscous state of the damping layer remarkably. The damping properties of the cocured composite increase owing to the damping of the interface , and the loss factor by DMA is higher than that by prediction when the damping layer is in the glassy state.