Mechanical response and parameter optimization of bionic sandwich energy absorption structure with double sinusoidal corrugated level dislocation

To improve the energy absorption efficiency of the cushioning structure and the driver's safety in vehicle passive safety, nine three-layer energy absorption structures were proposed using the mantis shrimp claw as a bionic prototype. The optimal structure of a double sinusoidal bidirectional dislocation wavy structure (DBD) was selected through the energy absorption evaluation index. The effects of two parameters, wall thickness T and section height H, on the energy-absorbing performance of the structure are further analyzed, and the optimal parameter combinations are obtained by using a multi-objective optimization method to obtain the Pareto frontier set of the optimal solution. The results show that the indexes are 18.38 kN for the IPF, 15.99 kJ/kg for the SEA, and 79.24% for the CFE, which are compared to a decrease of 1.32% for the IPF, an increase of 34.83% for the SEA, and an increase of 34.83% for the CFE. 34.83% and CFE by 40.49%. The crashworthiness of the double sinusoidal staggered structure is much better than that of the triangular sandwich structure. This study can provide a reference for the subsequent study of layered sandwich structures.