Shihao Han, Zhao Wang, Zeliang Liu, Xi Liang, Bo Liang
Bionic energy-absorbing lattice structures with great energy absorption and collision safety have always been a focus of researchers. In order to develop energy-absorbing structures with higher specific energy absorption ( SEA ) and lower peak crushing force ( PCF ), this paper proposes the construction of single-type and multi-type hybrid three-periodic minimal surfaces (TPMS) lattice structures using a transition layer formed by the Log-sigmoid activation function. TPMS lattice structures were fabricated using selective laser melting (SLM) technology. Through a series of experiments and numerical simulations, the mechanical response and impact resistance of the structure under axial loading were systematically studied, and the deformation patterns and influencing factors of the hybrid lattice structure were thoroughly investigated. Concurrently, the response surface method (RSM) and the non-dominated sorting genetic algorithm-II (NSGA-II) were utilized to perform a multi-objective optimization analysis of the hybrid structure. The findings suggest that the P-FRD hybrid structure demonstrates a notable enhancement in crashworthiness. In comparison to the P-type single-type TPMS lattice structure, the SEA has increased by 107.42%, and the PCF has decreased by 82.43%. The optimal solution obtained by the minimum distance method after optimization showed that the SEA of the P-FRD type was improved by 43.42% compared to the P type, and the PCF was reduced by 95.68%. Multi-type hybrid lattice structures offer a new approach to enhancing the crashworthiness of biomimetic energy-absorbing structures.