含分层损伤复合材料层合板频率响应函数分析

摘要

振动分析中含分层损伤复合材料层合板的动力特性是非常重要的，本文主要研究含分层损伤层合板的频率响应函数(FRFs)。首先，建立分层模型和基于FOSD理论的有限元层合板单元，为保证分析模型中避免出现上子板与下子板间的脱离或嵌入，引入了16节点虚拟界面罚单元；其次，根据Adams应变理论，由层合板SDC推导出相应结构振动的模态阻尼；最后，对0％－80％不同分层大小层合板的分析计算结果，讨论了不同分层大小对受损结构的固有频率、SDC和FRFs的影响。本研究不仅有助深入理解含分层复合材料层合板的动力特性，而且可发展用来预报复合材料层合板分层损伤的程度。%This paper deals with the frequency response functions of composite laminated plate with delamination.A virtual interface element is developed,which is inserted in the delaminated region for preventing overlap and penetration between the upper and lower sublaminates during vibration process.Based on Adams' strain energy method,a damping model is applied for predicting the specific damping capacity (SDC).A finite element method for calculating frequency response functions is established.Some numerical results are given.The method provided in this paper is not only to get better understanding of dynamic behavior,but also to be used for prediction of the damaged state in the composite plates.