共固化缝合阻尼复合材料的动力学性能

Dynamic Property of Co-cured Stitched Damping Composite Structure

为了研究共固化缝合阻尼复合材料(co-cured stitched damping composite,简称CSDC)动力学性能,建立了CSDC方形板的有限元模型,用有限元数值模拟方法研究了CSDC的动力学性能,通过试验与模拟数据的对比验证了模拟方法的有效性。在验证有限元模拟模型基础上,得出结论:随着针距或行距的增大CSDC方形板的1阶模态频率减小,一阶损耗因子增大;阻尼层厚度增加,CSDC方形板的1阶模态频率与模态损耗因子增大;CSDC方形板中的总阻尼层厚度相同,增加结构中的阻尼层数目,可以有效增大结构的模态损耗因子。该结果的实际意义在于可以通过改变共固化缝合阻尼复合材料结构的参数来避免共振现象,为CSDC广泛应用奠定基础。

The finite element model of co-cured stitched damping composite(CSDC) square plates is established. The dynamic properties of CSDC are studied by finite element numerical simulation method. The validity of the simulation method is verified by comparing the experimental results with the simulated data. Through the verification of the finite element simulation model,it can be obtained that the first-order modal frequency of the CSDC square plates decrease and the first-order loss factor increase with the increase of the stitch length or the line spacing. The first-order modal frequency and the modal loss factor of the CSDC square plates increase as the damping layer thickness increases. When the total damping layer thickness is constant and the number of damping layers is increased,the modal loss factor of the structure can be improved effectively. The practical significance of this result is that the resonance phenomenon can be avoided by changing the parameters of the CSDC,which lays a foundation for the wide application of CSDC.