Axial Crashworthiness and Multi-Objective Optimization of a Bio-Inspired Corrugated Sandwich Tube

Bio-inspired thin-walled energy-absorbing structures have attracted wide attention due to their excellent energy absorption characteristics. Inspired by the internal microstructure of the dactyl club of the marine stomatopod, Odontodactylus scyllarus, a bio-inspired corrugated sandwich tube (BCST) with a similar cross-sectional configuration, was designed. To verify the axial crashworthiness of the BCST, axial impact tests were first conducted on single-cell and four-cell thin-walled tubes to validate the models. Subsequently, the crashworthiness of the BCST is systematically investigated using ABAQUS/Explicit 6.14. The influences of material properties, the number of bio-inspired cells, wall thickness. Finally, a multi-objective optimization was conducted by combining the response surface method (RSM) with the non-dominated sorting genetic algorithm (NSGA-II), aiming to maximize specific energy absorption (SEA) and minimize crushing displacement (S), yielding the optimal design parameters for the BCST structure.