On buckling behaviors of a typical bending-dominated periodic lattice

摘要

We have numerically and experimentally studied the elastic stability and buckling behaviors in a particular kind of bending-dominated periodic lattice (BDPL) composed of curved cell walls. When the BDPL is subjected to certain amount of uniaxial compression load, in-plane or out-of-plane elastic buckling occurs. The two instability mechanisms in such planar structured panels are investigated based on finite element simulations and experiments, and a systematic parametric study has been conducted to study various factors influencing the buckling behavior. The results show that increasing the curvature of lattice struts could lead to a decrease in critical buckling loads for both in-plane and out-of-plane buckling. The spatial ratio of struts and the thickness of the studied panel are found also to play a significant role. The different buckling modes can be observed by altering the microstructure parameters of the BDPL, such as the strut curvature. This study is deemed to be helpful in the design of lattice metamaterials composed of curved struts, which can be useful in energy absorption and mechanical auxeticity.