基于实验模态分析的点阵夹层结构动态性能预测  

DYNAMIC PERFORMANCE OF TRUSS CORE SANDWICH STRUCTURES BASED ON MODAL ANALYSIS EXPERIMENTS

作　　者：李斌潮[1] 张钱城[2] 卢天健[1] 

机构地区：[1]西安交通大学强度与振动教育部重点实验室,西安710049 [2]西安交通大学材料科学与工程系,西安710049

出　　处：《固体力学学报》2008年第4期373-378,共6页Chinese Journal of Solid Mechanics

基　　金：国家重大基础研究计划项目(2006CB601202;2006CB601204);国家高技术研究发展计划项目(2006AA03Z519);国家自然科学基金项目(10572111;10632060);国家"111"引智计划项目(B06024)资助

摘　　要：引入均一化等效理论,对金字塔型结构芯体夹层材料的芯体弹性常数进行均一化等效处理,并将其用于研究该夹层材料结构的动态性能.同时采用三维(3D)离散有限元模型计算了结构的动态性能.为验证了理论预测的正确性,设计并制备了金字塔点阵悬臂梁,进行了实验模态分析,将实验结果与理论计算的各阶自振频率进行了比较.结果表明:该模型对低阶自振频率的计算结果与实验结果、3D离散有限元模型计算结果吻合得都比较好,一阶自振频率误差不到5%,其它误差在10%左右.The homogenization technique is introduced for three-dimensional （3D） pyramidal trusscore sandwich panels,which is then used to establish a two-dimensional （2D） single-layer sandwich model so that the effective elastic constants as well as the dynamic characteristics of the sandwich can be deter- mined. Full finite element simulations on 3D truss-core sandwiches are subsequently carried out. The validity of the analytical and numerical predictions is checked against experimental measurements on pyramidal truss-core sandwich cantilevers. Satisfactory overall agreement is achieved between test data and theoretical predications.

关 键 词：点阵材料 均一化 有限元 夹层板 模态分析 

分 类 号：O342[理学—固体力学]