轻质高强类蜂窝夹层结构轴向压缩屈曲失效分析

Failure analysis of axial compression buckling of lightweight and high strength quasi-honeycomb sandwich structure

基于传统力学理论和Engesser法,建立类蜂窝夹层结构受压载荷模型,推导轴向压缩载荷作用下的临界屈曲载荷计算公式,通过实验与数值模拟相结合的方式验证了该理论公式准确性。同时,运用理论分析和数值模拟相结合的方法研究了类蜂窝芯胞元个数、面板厚度以及胞元参数等对结构稳定性的影响,进而得到等效密度与屈曲载荷对胞元参数响应关系。研究结果表明,在不考虑结构轻质时,增大上、下面板厚度和胞元壁厚可提高屈曲载荷,增强结构可靠性;在考虑结构轻质时,增大斜边边长在有效减小等效密度的同时,可有效增大整体屈曲载荷。

Based on traditional mechanics theory and Engesser method,a compression load model of quasi-honeycomb sandwich structure was established,the calculation formula of critical buckling load under axial compression load was derived,and the accuracy of the theoretical formula was verified combining experiment and numerical simulation.Using the combination method of theoretical analysis and numerical simulation,the influence of the number of quasi-honeycomb core cells,panel thickness and cell parameters on the structural stability was studied,and then the relationship between the equivalent density and the buckling load to the response of cell parameters was obtained.The research results show that without considering the structure lightweight,increasing the thickness of the upper and lower panels and the cell wall thickness can increase the buckling load and enhance the structural reliability;considering the structure lightweight,increasing the length of the hypotenuse can effectively reduce the equivalent density and increase the whole buckling fore.