Abstract：Three-dimensional microlattice material is a kind of ultra-lightweight structural material composed of complex topological cells arranged periodically, which combines extremely low density, superior mechanical properties and excellent energy absorption capacity. Accordingly, it becomes an important novel strategic material to meet the requirements of lightweight, impact resistance and multifunctional integration. The rapid development of additive manufacturing technology has brought convenient conditions for the fabrication and optimal design of three-dimensional microlattice materials. The combination of microlattice design and additive manufacturing provides new ideas for the realization of lightweight and multifunctional integration of protective structures in aerospace, rail transit, weapons and other fields. In order to clarify the dynamic mechanical properties and deformation mechanism of additively-manufactured 3D microlattice materials, further carry out multi-scale optimization design of these materials, and expand their application in the field of impact protection, the research results of mechanical behavior and design of additively-manufactured 3D microlattice materials were systematically reviewed and prospected. According to the multi-scale structure characteristics of additively-manufactured 3D microlattice materials, comments on the macroscopic dynamic response and collapse mechanism, mesoscopic properties characterization and structural optimization design, microscopic structural characteristics as well as deformation mechanisms of different microlattice materials were presented. Some prospects on the future problems and challenges of additively-manufactured 3D microlattice materials in the field of impact protection were pointed out.
2023, Vol. 44 
