[SIS2] Novel processing strategies for Beam Based AM

[14B-SIS2-03] Solid-Strut, Hollow-Strut and Thin-Plate Metal Lattice Metamaterials

*M. Qian¹, J. Noronha¹, H. Zhong², M. Leary¹, M. Brandt¹ (1.Royal Melbourne Institute of Technology (RMIT), Australia, 2.Shanghai Jiao Tong University, China)

Keywords:Metal metamaterials , Lattice , Solid strut , Hollow strut , Thin plate

The growing demand for lightweight, high-performance engineering materials continues to drive material innovation. Mechanical metamaterials are cellular materials, which usually consist of interconnected struts, plates, shells, or their mixtures, organized into repeating unit cells. Among these, strut-based metal lattice materials are probably the most common form of metal mechanical metamaterials, while thin-plate metal lattices are an emerging new class of lightweight metal metamaterials. Based on detailed experimental studies and numerical simulations, this paper compares the structural efficiency and deformation behaviour for solid-strut, hollow-strut and thin-plate metal lattice metamaterials manufactured by laser powder bed fusion (LPBF). The results show that at the same density, thin-plate metal lattice metamaterials exhibit the highest structural efficiency in terms of yield strength, followed by hollow-strut and then solid-strut metal lattice metamaterials. Numerical analysis provides insights into their deformation behaviours. New design strategies are proposed for improving the structural efficiency of each type of lattice metamaterial.