复合蛋盒型夹层结构动态压缩的力学性能研究

蛋盒型结构是一种新型的周期性单胞轻质结构，该结构具有低密度、高比强度和吸能能力强等特性。本文通过有限元法建立了平面蛋盒型夹芯板与曲面蛋盒型夹心板的落锤冲击模型，对比分析了其抗冲击特性，并且对不同条件下的蛋盒型结构的动态压缩力学性能进行对比分析。结果表明：受到冲击时的夹芯板会经历三个阶段，其中压缩阶段为主要的吸能阶段，通过将冲击动能转变为夹芯板的塑性耗散能来达到缓冲吸能的目的，同时这些特性依赖于成型高度以及上下面板厚度等结构参数，单胞结构成型高度为6mm、单胞周期为20mm、上下面板板厚为0.5mm、曲率半径为400mm时，复合蛋盒型夹芯板具有更好地力学性能。

Study on dynamic compression properties of egg-box sandwich structure

Egg-box structure is a new type of periodic single cell lightweight structure, which has the characteristics of low density, high specific strength and high energy absorption capacity.Was established based on finite element method in this paper, surface with a plane egg box type sandwich board egg carton drop hammer impact model of sandwich panels, a comparative analysis of its impact resistant properties, and the different egg box type structure under the condition of dynamic compression mechanical properties were analyzed, the results show that the impact of sandwich board goes through three stages, including the compression stage as the main stage of energy absorption, through the impact kinetic energy is transformed into the sandwich board plastic dissipation can to achieve the goal of buffer energy absorption.At the same time, these characteristics depend on the forming height and the thickness of upper and lower panels and other structural parameters. When the forming height of single-cell structure is 6mm,the period of single cell is 20mm ,the thickness of upper and lower panels is 0.5mm, and the radius of curvature is 400mm, the composite egg-box sandwich panel has better mechanical properties.