Stiffness optimisation of sandwich structures with elastically isotropic lattice core

Research output: Contribution to journalArticlepeer-review

Abstract

This study concerns homogenisation-based stiffness optimisation with elastically isotropic plate and truss-based lattice structures. Due to the lattices’ isotropy, an optimised design can be obtained without including each lattice's rotational degree of freedom (DOF) as a design variable. Stiffness optimisation was performed on sandwich structures with lattice cores. Two optimised sandwich structures were fabricated using material extrusion additive manufacturing, and their deformation behaviour was studied using digital image correlation (DIC). DIC results revealed that when using a truss-based lattice as the core, certain trusses were susceptible to local strain concentration. On the other hand, sandwich structures with a plate-based lattice as the core showed an evenly distributed strain field, indicating loads can be more efficiently carried. Optimisation results in a maximum increase of 14.0 % for bending stiffness and 24.2 % for energy absorption. This research stands out for its novel selection of lattices and in-depth analysis of the full-field strain distribution in optimised sandwich lattice structures during bending. Combining experimental and numerical methods, the study sheds light on the deformation mechanism of these additively manufactured lattices, offering additional insights.
Original languageEnglish
Article number111408
Number of pages14
JournalThin-Walled Structures
Volume195
DOIs
Publication statusPublished - Feb 2024

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Lattice structures
  • Additive manufacturing
  • Sandwich structures
  • Stiffness optimisation
  • Full-field strain measurement

Fingerprint

Dive into the research topics of 'Stiffness optimisation of sandwich structures with elastically isotropic lattice core'. Together they form a unique fingerprint.

Cite this