Simple optimal lattice structures for arbitrary loadings

Yiqiang Wang*, Jeroen P. Groen, Ole Sigmund

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

79 Downloads (Pure)


This paper identifies four categories of optimal truss lattice structures (TLSs) that together provide ultimate stiffness for arbitrary multi-loading scenarios in the low volume fraction limit. Each category consists of 7 periodic sets of straight bars, forming periodic parallelepiped unit cells. Compared to other optimal TLSs, the identified TLSs most probably have the simplest possible geometries with the least number of bar sets. Macroscopic properties of a TLS are estimated using a superposition model, and an optimization problem is solved to determine the exact geometries of the optimal TLSs. Systematic optimization results, run for thousands of random multi-loading conditions, are compared to (postulated) theoretical bounds for both truss and plate lattice structures. The results clearly demonstrate near-optimality of the identified TLSs (relative difference mostly within machine precision except in few cases up to 0.1%) for any loading scenarios in linear elasticity. At the same time, the optimal anisotropic TLSs always have inferior stiffness to the corresponding optimal plate lattice structures and this inferiority is bounded between 1 (single uniaxial load) and a factor of 3 (optimal isotropy).

Original languageEnglish
Article number100447
JournalExtreme Mechanics Letters
Number of pages6
Publication statusPublished - 2019


  • Anisotropic lattice structure
  • Energy bound
  • Maximum stiffness
  • Multiple loading
  • Truss lattice structure

Fingerprint Dive into the research topics of 'Simple optimal lattice structures for arbitrary loadings'. Together they form a unique fingerprint.

Cite this