Additively manufactured metallic pentamode meta-materials

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Abstract

Mechanical metamaterials exhibit unusual mechanical properties that originate from their topological design. Pentamode metamaterials are particularly interesting because they could be designed to possess any thermodynamically admissible elasticity tensor. In this study, we additively manufacture the metallic pentamode metamaterials from a biocompatible and mechanically strong titanium alloy (Ti-6Al-4V) using an energy distribution method developed for the powder bed fusion techniques. The mechanical properties of the developed materials were a few orders of magnitude higher than those of the similar topologies fabricated previously from polymers. Moreover, the elastic modulus and yield stress of the presented pentamode metamaterials were decoupled from their relative density, meaning that the metallic meta-biomaterials with independently tailored elastic and mass transport (permeability) properties could be designed for tissue regeneration purposes.

Original languageEnglish
Article number091905
Number of pages5
JournalApplied Physics Letters
Volume110
Issue number9
DOIs
Publication statusPublished - 2017

Keywords

  • Metamaterials
  • Elastic moduli
  • Laser beams
  • Yield stress
  • Topology

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