Understanding the superior mechanical properties of hollow-strut metal lattice materials

Intricate hollow-strut metal lattice materials are an emerging class of novel metallic cellular materials enabled by additive manufacturing. This work shows that hollow-strut Ti-6Al-4V lattice materials are consistently stronger and stiffer (up to 60% better) than their solid-strut counterparts of t...

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Bibliographic Details
Published in:Scripta materialia 2023-04, Vol.228, p.115341, Article 115341
Main Authors: Zhong, H.Z., Song, T., Li, C.W., Das, R., Gu, J.F., Qian, M.
Format: Article
Language:English
Subjects:
Additive manufacturing
Deformation mechanism
Hollow strut
Lattice material
Yield strength
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Summary:Intricate hollow-strut metal lattice materials are an emerging class of novel metallic cellular materials enabled by additive manufacturing. This work shows that hollow-strut Ti-6Al-4V lattice materials are consistently stronger and stiffer (up to 60% better) than their solid-strut counterparts of the same relative density, both experimentally and through finite element analysis (FEA). The underlying reasons are investigated using analytical models derived from the Timoshenko-beam theory, which considers deformation by concurrent stretching, bending and shear, rather than the single-mode deformation mechanism assumed by the Gibson-Ashby model. Hollow-strut lattices exhibit higher resistance to bending than solid-strut lattices at the same strut length and relative density, thereby leading to increased strength and stiffness. Hollow-strut metal lattices offer an unusual option for lightweight designs, with better mechanical properties at the same or lower density than solid-strut metal lattices. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2023.115341