J. Mater. Sci. Technol. ›› 2023, Vol. 162: 227-233.DOI: 10.1016/j.jmst.2023.03.043

• Letter • Previous Articles     Next Articles

Ultralight, ductile metal mechanical metamaterials with super elastic admissible strain (0.1)

H.Z. Zhonga,b, T. Songb, R. Dasb,c, C.W. Lia, J.F. Gua,*, M. Qianb,*   

  1. aInstitute of Materials Modification and Modelling, Shanghai Jiao Tong University, Shanghai 200240, China;
    bCentre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;
    cSir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
  • Received:2022-12-22 Revised:2023-03-01 Accepted:2023-03-19 Published:2023-11-01 Online:2023-05-16
  • Contact: *E-mail addresses: gujf@sjtu.edu.cn (J.F. Gu), ma.qian@rmit.edu.au (M. Qian).

Abstract: Mechanical metamaterials are architectured cellular materials with unusual properties. Herein we report another type of metal mechanical metamaterials—their elastic admissible strain (EAS) is on the order of 0.1, compared to about 0.01 for common metallic materials. Four conditions are required for a metal mechanical metamaterial to achieve this super EAS: (i) bending-dominated deformation; (ii) low density; (iii) an appropriate lattice topology, and (iv) an intrinsically high EAS for the lattice strut constituent material. The findings of this work extend perspectives on metal mechanical metamaterials.

Key words: Metamaterials, Lattice, Superelasticity, Elastic admissible strain, Ti-6Al-4V, Titanium