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. Drop hammer impact model of egg box type sandwich panels with a plane and curved surface was established based on finite element method in this research. A comparative analysis of its impact resistant properties, and the dynamic compression mechanical properties of different egg box type structure under different conditions 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 transforming into the sandwich board plastic dissipation to achieve the goal of buffer and 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 6 mm, the period of single cell is 20 mm, the thickness of upper and lower panels is 0.5 mm, and the radius of curvature is 400 mm, the composite egg-box sandwich panel has better mechanical properties.

Automated summary

This research established the drop hammer impact model of egg-box type sandwich panels and analyzed their impact resistant properties and dynamic compression mechanical properties under different conditions. The results showed that the sandwich board goes through three stages during impact absorption, with characteristics depending on specific structural parameters.