板芯脱黏损伤对复合材料蜂窝夹层结构振动特性的影响

Influence on Vibration Characteristics of Composite Honeycomb Sandwich Structure with Face/Core Debonding

板芯界面脱黏是复合材料蜂窝夹层结构最常见的损伤,对其开展振动分析具有科学价值和工程意义。基于蜂窝芯材的细观构造,利用有限元软件ANSYS建立了复合材料蜂窝夹层结构的有限元模型,研究脱黏损伤的尺寸和位置对振动特性的影响。结果表明:脱黏损伤使蜂窝夹层结构的固有频率降低;损伤尺寸越大,固有频率越低;损伤位于结构中部时4阶固有频率最低,其余各阶固有频率随着损伤越接近固支端而越低;损伤尺寸和损伤位置对不同阶振动模态的影响程度不同。研究方法和结论为此类结构的损伤检测以及损伤容限设计与分析提供了必要的参考依据。

The face/core debonding is the most common damage to composite honeycomb sandwich structure,and analysis of vibration is of scientific value and engineering significance worthy.Based on the mesostructure of honeycomb core,the finite element model of composite honeycomb sandwich structure is established by using ANSYS to study the influence of size and location of debonding on vibration characteristics.The results show that the debonding makes the natural frequency of honeycomb sandwich structure lower.The larger the damage size,the lower the natural frequency.The fourth-order natural frequency is the lowest when the damage is located in the middle,and the other natural frequencies become lower while the damage approaches the fixed end.The damage size and location change with difference of influence on the vibration modes of different orders.The research methods and conclusions provide a necessary reference for damage detection,damage tolerance design and analysis of composite honeycomb sandwich structure.