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Imperfection‐Enabled Strengthening of Ultra‐Lightweight Lattice Materials
Lattice materials are an emerging family of advanced engineering materials with unique advantages for lightweight applications. However, the mechanical behaviors of lattice materials at ultra‐low relative densities are still not well understood, and this severely limits their lightweighting potential. Here, a high‐precision micro‐laser powder bed fusion technique is dveloped that enables the fabrication of metallic lattices with a relative density range much wider than existing studies. This technique allows to confirm that cubic lattices in compression undergo a yielding‐to‐buckling failure mode transition at low relative densities, and this transition fundamentally changes the usual strength ranking from plate > shell > truss at high relative densities to shell > plate > truss or shell > truss > plate at low relative densities. More importantly, it is shown that increasing bending energy ratio in the lattice through imperfections such as slightly‐corrugated geometries can significantly enhance the stability and strength of lattice materials at ultra‐low relative densities. This counterintuitive result suggests a new way for designing ultra‐lightweight lattice materials at ultra‐low relative densities.
Imperfection‐Enabled Strengthening of Ultra‐Lightweight Lattice Materials
Lattice materials are an emerging family of advanced engineering materials with unique advantages for lightweight applications. However, the mechanical behaviors of lattice materials at ultra‐low relative densities are still not well understood, and this severely limits their lightweighting potential. Here, a high‐precision micro‐laser powder bed fusion technique is dveloped that enables the fabrication of metallic lattices with a relative density range much wider than existing studies. This technique allows to confirm that cubic lattices in compression undergo a yielding‐to‐buckling failure mode transition at low relative densities, and this transition fundamentally changes the usual strength ranking from plate > shell > truss at high relative densities to shell > plate > truss or shell > truss > plate at low relative densities. More importantly, it is shown that increasing bending energy ratio in the lattice through imperfections such as slightly‐corrugated geometries can significantly enhance the stability and strength of lattice materials at ultra‐low relative densities. This counterintuitive result suggests a new way for designing ultra‐lightweight lattice materials at ultra‐low relative densities.
Imperfection‐Enabled Strengthening of Ultra‐Lightweight Lattice Materials
Ding, Junhao (Autor:in) / Ma, Qingping (Autor:in) / Li, Xinwei (Autor:in) / Zhang, Lei (Autor:in) / Yang, Hang (Autor:in) / Qu, Shuo (Autor:in) / Wang, Michael Yu (Autor:in) / Zhai, Wei (Autor:in) / Gao, Huajian (Autor:in) / Song, Xu (Autor:in)
Advanced Science ; 11
01.11.2024
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Imperfection‐Enabled Strengthening of Ultra‐Lightweight Lattice Materials
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