Closed tubular mechanical metamaterial as lightweight load-bearing structure and energy absorber

Periodic truss-lattice materials, especially when combined with current additive manufacturing techniques, are attracting attention in lightweight material engineering. As a member of the elementary cubic truss family, simple-cubic lattice possesses highest stiffness and strength along principal directions plays an important role load-bearing mechanical metamaterials. High anisotropic properties low resistance to buckling loading shearing loading, however, limit its use energy absorption. Here, we present class closed tubular limited direction dependence high irregular stable post-yield response. The fabrication complex structure was made possible by direct laser writing at microscale. Experiments simulations demonstrate that both elastic modulus yield significantly larger than those lattice, regardless direction. At relative density 0.1 compared can absorb respectively 4.45 times 6.14 as much [100] [110]. average normalized Young’s 28% 53% most outstanding shellular metamaterial same mass. Such excellent make it potential candidate for applications