Tunable Energy Absorption Characteristics of Architected Honeycombs Enabled via Additive Manufacturing

S. Kumar, J. Ubaid, R. Abishera, A. Schiffer, V. S. Deshpande

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Tailoring of material architectures in three-dimensions enabled by additive manufacturing (AM) offers the potential to realize bulk materials with unprecedented properties optimized for location-specific structural and/or functional requirements. Here we report tunable energy absorption characteristics of architected honeycombs enabled via material jetting AM. We realize spatially tailored 3D printed honeycombs (guided by FE studies) by varying the cell wall thickness gradient and evaluate experimentally and numerically the energy absorption characteristics. The measured response of architected honeycombs characterized by local buckling (wrinkling) and progressive failure reveals over 110% increase in specific energy absorption (SEA) with a concomitant energy absorption efficiency of 65%. Design maps are presented that demarcate the regime over which geometric tailoring mitigates deleterious global buckling and collapse. Our analysis indicates that an energy absorption efficiency as high as 90% can be achieved for architected honeycombs, whereas the efficiency of competing microarchitected metamaterials rarely exceeds 50%. The tailoring strategy introduced here is easily realizable in a broad array of AM techniques, making it a viable candidate for developing practical mechanical metamaterials.

Original languageBritish English
Pages (from-to)42549-42560
Number of pages12
JournalACS Applied Materials and Interfaces
Volume11
Issue number45
DOIs
StatePublished - 13 Nov 2019

Keywords

  • additive manufacturing
  • architected honeycombs
  • cellular materials
  • energy absorption
  • spatial tailoring

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