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.