复合材料板壳耦合结构高频动响应的试验与计算研究

项目名称： 复合材料板壳耦合结构高频动响应的试验与计算研究

项目编号： No.51305330

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 解妙霞

作者单位： 西安交通大学

项目金额： 27万元

中文摘要： 超音速飞行器中复合材料部件的高频动响应预示是飞行器结构设计的关键内容之一。能量有限元法在结构高频动响应预示方面具有能够预示局部细节响应信息的独特优势。针对目前能量有限元方法预示复合材料结构高频动响应时存在的两个瓶颈问题：介质各向异性导致的波群速度方向与波传播方向不一致和耦合接头处能量密度的不连续性问题，本研究采用试验和计算相结合的方法，以单层连续纤维增强复合材料板、壳基本构件及板-壳耦合结构为对象，研究各向异性结构中非均匀、非扩散弹性波引起的波数的空间角依赖性，建立复合材料板结构的能量密度控制方程；研究各向异性板壳耦合结构界面处的能量流动特征，揭示复合材料各向异性特征对耦合界面处能量分布和能量传递的影响规律；并开发可应用于复合材料板壳结构的能量有限元分析软件，以期获得复合材料结构高频动力学响应的精确预示。

中文关键词： 能量有限元；能量转移系数；正交各向异性；复合材料；高频动响应

英文摘要： The prediction of high-frequency dynamic response is one of important research content in the stage of structure design for supersonic aircraft . Energy finite element method (EFEM) is a very promising new approach to solve the high-frequency dynamic response of composite structure, because of it's ability of predicting the detail response information.The research work focus on the two key issues involved in predicting high-frequency dynamic response of anisotropic composite structures with EFEM: 1.the difference between the direction of group velocity and the direction of wave propagation direction 2.discontinuity of energy density at the conjunction. Aimed at the fiber reinforced composite material, by using of experimental and numerical method, the angle dependence of wavenumber caused by the non-uniform, non-diffuse elastic wave in anisotropic structure is studied, the rule of energy flow in composite plate and shell structures is surveyed, the governing equation which take the energy density as variable for these structures is formulated; further, the property of energy flow in built up structures composed of plate and shell is explored, the energy transfer characteristic at the junction is investigated, the effect of anisotropy in composite on energy distribution and energy transfer is revealed; in additio

英文关键词： Energy finite element analysis；Transmission coefficient；Orthotropic property；Composite materials；High-frequency dynamic response