变形可控内凹蜂窝结构抗冲击性能研究

The concave honeycomb structure has broad application prospects in the automotive industry, aerospace,biomedical and other fields due to their unique deformation mode,excellent impact resistance and energy absorption properties, and lightweight characteristics. Based on the traditional Concave hexagonal honeycomb structure,a deformation-controllable concave honeycomb structure based on rounded corners enhancement is proposed by introducing a rounded corner design and changing the arrangement of the rounded corners,and a deformation-controllable honeycomb structure with deformation modes of Z and Y shapes is designed and prepared using metal 3D printing technology. In order to explore its impact resistance,its deformation mode and energy absorption properties are analyzed through the quasi-static compression and drop weight impact experiments and the finite element numerical simulation. The research results show that the proposed honeycomb structure achieves controllable deformation mode and has higher crushing stability,and the energy absorption performance of the structure is significantly improved through customized Z and Y deformation modes. For the same structure,the energy absorption performance gradually improves as the fillet radius increases. As the speed increases,the structural deformation mode gradually evolves into an I type collapse,the platform force generally shows an increasing trend,and the energy absorption efficiency gradually decreases. Due to the asymmetric arrangement of the rounded corners,the Z shape structure has better impact resistance than the Y shape structure in most cases. The research results can provide reference for the crashworthiness design of new structures under dynamic impact.