Decoupling microlattice metamaterial properties through a structural design strategy inspired by the Hall–Petch relation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

  • Lei Zhang
  • Bo Song
  • Jinliang Zhang
  • Yonggang Yao
  • Yusheng Shi

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number118214
Journal / PublicationActa Materialia
Volume238
Online published27 Jul 2022
Publication statusPublished - 1 Oct 2022

Abstract

With the development of structural architectures, the demand for metamaterials with multiphysical characteristics has increased. The relationships between different properties, such as mechanical and mass-transport properties for bone scaffolds, are often mutually conflicting. Consequently, the optimization of these properties for metamaterials structured on the micro- to macroscale is challenging. In this study, inspired by the Hall–Petch relation, which indicates how one can independently tailor the strength and mass, we use a diamond configuration to construct microlattice metamaterials with decoupled mechanical and mass-transport properties to cater to artificial bone scaffolds. The elasticity and permeability are synchronously optimized using simple scaling laws. The results of compression experiments and transportation calculations demonstrate the promising performance of microlattices with an aspect ratio of 1 and at least 4 unit cells in the array direction. Furthermore, hierarchical microlattice metamaterials partitioned into spongy and compact zones are designed for bone scaffold applications. The proposed approach provides an innovative framework for developing multi-physics metamaterials for widespread engineering applications.

Research Area(s)

  • 3D printing, Bone scaffold, Hall–Petch relation, Mass-transport properties, Microlattice metamaterials