Experimental study on quasi-static deformation and energy absorption performance of gradient functional columnar cell energy absorbing materials
Quasi-static compression tests were conducted using a universal testing machine to investigate the de-formation rules and energy absorption performance of gradient functional columnar cell energy-absorbing materials.Four different core layer configurations,namely,material type gradient configuration,equatorial radius gradient configuration,polar radius gradient configuration,and wall thickness gradient configuration,were studied.The re-search indicates that the deformation and energy absorption performance of the specimens are primarily influenced by the upper layer cells in the early stages of the compression process,while in the later stages,they are mainly af-fected by the lower layer cells.Homogeneous columnar cell energy-absorbing materials exhibit relatively small differences between the upper-layer and lower-layer cells throughout the deformation process,whereas gradient functional columnar energy-absorbing materials show characteristics of layer-by-layer deformation and progressive energy absorption.Under quasi-static compression loading with a displacement of 80%,since the deformation lev-els of all specimens are sufficiently high,the energy absorption is mainly influenced by the compressive force in-dex.Higher compressive force indices result in higher energy absorption,while lower indices lead to larger dis-placements and higher energy absorption.