基于Layerwise理论的共固化粘弹阻尼复合材料动特性分析

共固化粘弹性复合材料兼具结构承载和阻尼减振功能。针对传统的混合单元法在应用于粘弹性夹层复合材料结构阻尼性能分析时存在着前处理困难、计算规模大、精度低以及难以考虑正交各向异性铺层自身损耗能力的缺点，推导了一种基于Layerwise离散层理论的四节点四边形复合材料层合板单元，并利用直接复特征值解法建立了共固化粘弹性复合材料结构的阻尼性能分析方法。将该方法应用于不同的阻尼结构，分析结果与文献中已公开结果和混合单元法的计算结果进行了对比验证。结果表明，基于离散层理论的层合板单元具有计算精度高、前处理建模简单和计算规模小的优点，可有效应用于复杂共固化粘弹性复合材料结构的阻尼性能分析和设计。

Layerwise dynamic analysis of composite laminates with co-cured viscoelastic damping layers

The Co-curing of thin viscoelastic damping materials in the composite laminates can improve their structural damping with less loss of stiffness and strength. However, classic numerical simulation of the damped structures by hybrid finite element method demands a cumbersome computational work, especially for complicated layered structures. A new 4-node quadrangular plate finite element based on the discrete layerwise plate theory is developed in this paper for dynamics analysis of composite laminates with co-cured viscoelastic layers. The natural frequency and modal loss factors of different viscoelastic damped laminated beam, cylindrical shell and stiffened plate are computed. Results show that the proposed model can correctly describe the high shear pattern developed inside the thin viscoelastic layers and providing results with less computational work.