共固化复合材料粘弹阻尼结构的损耗因子研究

Damping Analysis of Cocured Composites with Interleaved Viscoelastic Layers

应用基于有限元的模态应变能法研究了共固化复合材料粘弹阻尼结构的损耗因子,同时考虑了粘弹性阻尼材料的频率依赖性和复合材料本身对振动能量的损耗,提出了该类型结构的有限元模型,并通过算例分析验证了该模型;考察了纤维增强复合材料本身的阻尼因素、柔性层的引入以及阻尼层的位置对复合材料粘弹阻尼结构损耗因子的影响,并给出了提高此类结构损耗因子的途径。

The modal loss factor of cocured laminated composites with embedded viscoelastic layers is predicted using the finite element based modal strain energy method with consideration of frequency dependency of viscoelastic materials. The contribution of energy dissipation of fiber-reinforced composites to the loss of whole system is taken into account in numerical analysis for more accurate results. Good agreements between the present results and those published have suggested the validity of the proposed approach. The effects of damping of fiber-reinforced composites, compliant layering and location of damping layers on the loss factor of damped composite beams have also been studied. Some ways to improve damping properties of cocured laminated composites are presented.