Development of novel auxetic LPBF-produced Ti6Al4V metamaterials

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Abstract
Mechanical (or structural) metamaterials are revolutionizing property tailoring, offering capabilities beyond conventional bulk materials to meet the demand for structural innovation. This work presents the design, fabrication, and characterization of a novel 2D Ti6Al4V mechanical metamaterial. Designed using a novel design methodology, the structure exhibits auxetic (negative Poisson's ratio) behaviour within its elastic domain. The metamaterial was produced using Laser Powder Bed Fusion (LPBF), and its mechanical response was experimentally tested and validated against numerical simulations. Furthermore, the influence of manufacturing-induced defects, including voids and geometrical deviations, on the mechanical behaviour was systematically correlated. The findings demonstrate that LPBF is a viable and effective method for producing 2D Ti6Al4V mechanical metamaterials capable of achieving high elastic strain, validating the integrated design and manufacturing approach.

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