Low velocity impact response of 3D printed structures formed by cellular metamaterials and stiffening plates: PLA vs. PETg

Filipe Amarante Santos, Hugo Rebelo, M. Coutinho, L. S. Sutherland, Corneliu Cismasiu, I. Farina, F. Fraternali

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

This work studies the low-velocity impact response of 3D-printed layered structures made of thermoplastic materials (PLA and PETg), which form sacrificial claddings for impact protection. The analyzed structures are composed of crushable cellular cores placed in between terminal stiffening plates. The cores tessellate either honeycomb hexagonal unit cells, or hexagonal cells with re-entrant corners, with the latter exhibiting auxetic response. The given results highlight that the examined PETg protectors exhibit higher energy dissipation ratios and lower restitution coefficients, as compared to PLA structures that have the same geometry. It is concluded that PETg qualifies as an useful material for the fabrication of effective impact protection gear through ordinary, low-cost 3D printers.

Original languageEnglish
Article number113128
JournalComposite Structures
Volume256
DOIs
Publication statusPublished - 15 Jan 2021

Keywords

  • Auxetic response
  • Cellular metamaterials
  • Low velocity impact
  • PETg
  • PLA

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