基于有限元法的蜂窝夹层结构稳定性研究

蜂窝夹层结构随面板厚度的逐渐变化会出现不同的屈曲现象。针对连续芯层有限元模型, 求出不同面板厚度时结构的屈曲因子, 并与经验失稳公式预测值进行对比, 两种方法的结果基本吻合。建立考虑芯层几何特征的有限元模型, 进行屈曲分析并研究芯层几何参数对结构稳定性的影响。介绍了一种局部屈曲现象——蜂窝壁屈曲, 提出了相应的失稳预测分析方法, 并与三维有限元分析结果进行比较, 验证该方法的正确性。对承受多轴惯性载荷的蜂窝夹层承力筒结构进行稳定性分析, 通过改变面板厚度和纵横惯性载荷比, 得到一系列有限元解, 给出了相关的多轴惯性载荷相关方程。

Stability problem of honeycomb sandwich structures based on finite element method

A research method of stability problem of honeycomb sandwich structures based on the finite element analysis is presented. The buckling factors of honeycomb sandwich structures with fixed size core were obtained with different faceplate thicknesses using homogenization core models. The solutions obtained with the finite element analysis approach were compared with the results from the conventional analytical formulas. The results obtained by two kinds of methods are basically consistent. The finite element models were used in the progress of structural stability analysis, considering the geometry characteristics of the core. And the effect of the core’s geometry characteristics on the stability problem was discussed. A local instability phenomenon, called cell-wall buckling, was introduced. A prediction analytical approach for the phenomenon is presented. And the results were compared with that of the finite element analysis to validate the proposed approach. The stability problem of satellite sandwich bearing cylinder under the multi-axis inertial loads was researched by the finite element method. The results were obtained with different faceplate thicknesses and different ratios of vertical and horizontal inertial load. The related analysis equation for the multi-axis inertial loads is given.