Impact resistance performance of a new cell sandwich Structure

Compared with traditional structures, the sandwich structures have higher strength, lighter weight, better impact resistance, and also higher earthquake resistance, better heat insulation, and strong plasticity. Sandwich structures are widely used in many fields including aerospace, shipping, construction, and transportation. Inspired by the elytra structure and concave hexagonal honeycomb structure of the unicorn beetle, a new cell structure is proposed. The periodic structure of this cell is used as the core of the sandwich panel, and the impact simulation of the sandwich structure is carried out with the software ABAQUS. The effects of the parameters of the sandwich structure on the buffering and energy absorption characteristics are studied. It is found that as the diameter of the corner cylinder of the cell structure of the core structure increases, the specific energy absorption value of the structure increases, while the concave angle of the cell structure has little effect on the impact characteristics of the structure. And the buffering and energy absorption characteristics of the structure with multiple impacts and different impact speeds are studied. As the impact velocity increases, the specific energy absorption value of the structure increases accordingly. Among multiple impact processes, the specific energy absorption is the largest in the second impact, and then the specific energy absorption value decreases as the number of impacts increases. Multiple impacts cause changes in the stress distribution of the upper plate, which affects the overall strength and stability of the structure.