修复对含分层损伤复合材料层合板振动特性的影响

本文工作是通过对含不同大小分层层合板结构分析,讨论拉伸和剪切修复刚度对含层间分层损伤复合材料层合板振动特性的影响.基于修补分层损伤结构变形特点,将含损层合板的基板、上子板和下子板采用Mindlin板单元离散,而损伤区修复效应以虚拟连接单元模拟,建立相应的有限元分析模型和计算方法.通过对含损层合板的振动分析,讨论并验证本文提出的修复分层损伤模拟连接单元模型的可能性和正确性,依据拉抻和剪切修复刚度对含损层合板固有频率的分别影响与综合影响,得到对分层损伤复合材料层合板修补的指导性原则.

EFFECT OF REPAIR ON VIBRATION CHARACTERISTICS OF LAMINATED COMPOSITE PLATES WITH DELAMINATION

The stiched and bonede repair of delamination problem of laminated cmposite plates is investigated.Considering characteristics of repaired laminated plates, the delamination model and finite element analysis method by using the first-order shear deformation theory are performed. In the analysis, the sitching and bonding effects are taken into account separately or all together. The result shows that proposed method coincides with experiment .It is shown that composite structures designed in a variety of configurations and a wide range of load intensities can effectively be repaired almost to all their original dynamic strength.The conclusion provides evaluation foundation for the repairs of damaged laminated composite plate with delamination.