MTPS金属蜂窝夹芯结构尺寸效应的数值分析

Numerical Analysis on Size Effect of Metal Honeycomb Sandwich Structure in MTPS

金属蜂窝夹心结构是可重复使用金属热防护系统的主要子结构 ,优化其结构参数 ,是提高设计质量的重要环节。根据修正 Gibson公式与最小势能、余能原理推导出蜂窝夹芯层的 9个等效弹性参数。考虑金属蜂窝夹心结构总质量与沿厚度方向的挠度值多指标要求 ,采用有限元正交数值迭代模拟方法 ,对结构的尺寸效应进行分析 ,并优选出良好的结构参数。分析结果表明 :影响最大的结构参数依次为金属蜂窝的高度、蜂窝的壁厚、面板厚度及蜂窝内切圆直径。

Metal honeycomb sandwich structure is one of the major s ubstructures in the reusable metal thermal protection system (MTPS). Optimizing the structural parameter is the most important step to improve the design level of MTPS. According to the modified Gibson formula and the principle of minimum c omplementary energy and minimum potential energy, equivalent elastic parameters of the honeycomb sandwich are given. Considering the comprehensive requirements of the whole structure weight and the maximum deflection value along the thickne ss, FE numerical simulation is carried out to analyze the size effect of metal s andwich structure based on the orthogonal design method. The analysis results sh ow that the most important structure parameters are as follows: the metal honeyc omb height, the honeycomb ribbon thickness, the face sheet thickness, and the in -circle diameter of the honeycomb.