Laser Sintered–Mechanical Nanocomposites With High Energy Absorption
YUAN Shangqin1 , WANG Zhihao1 , LI Jiang2 , ZHU Jihong2
(1. Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710072, China; 2. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China)
Abstract：An approach is proposed for creating 3D metamaterials of auxetic composite lattices via laser-sintering of carbon nanotubes reinforced nanocomposites, which provides a platform for the design and manufacturing of systems with programmable energy absorption capability. The optimization of constituent material and structural design enables the improvement of energy absorption performance across multiple scales. The energy absorption capacity of auxetic metamaterials is exponentially scaled with the relative density with the order of 2.5–3. The rationally topologized auxetic metamaterials exhibit a combination of high specific densification strength, ultrahigh energy absorption capacity (6.29MJ/m3 ), and excellent specific energy absorption (20.42J/g). Impressively, this group of auxetic metamaterials possesses the advantageous energy absorption capacity approaching that of titanium alloy foams as well as over a broad range of materials including plastic foams, aluminum alloy foams, and other 3D–printed lightweight structures.
2021, 
