Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published November 2017 | Supplemental Material
Journal Article Open

Reexamining the mechanical property space of three-dimensional lattice architectures


Lightweight materials that are simultaneously strong and stiff are desirable for a range of applications from transportation to energy storage to defense. Micro- and nanolattices represent some of the lightest fabricated materials to date, but studies of their mechanical properties have produced inconsistent results that are not well captured by existing lattice models. We performed systematic nanomechanical experiments on four distinct geometries of solid polymer and hollow ceramic (Al_2O_3) nanolattices. All samples tested had a nearly identical scaling of strength (σy) and Young's modulus (E) with relative density (ρ¯), ranging from σy∝ρ¯1.45 to ρ¯1.92 and E∝ρ¯1.41 to ρ¯1.83, revealing that changing topology alone does not necessarily have a significant impact on nanolattice mechanical properties. Finite element analysis was performed on solid and hollow lattices with structural parameters beyond those realized experimentally, enabling the identification of transition regimes where solid-beam lattices diverge from existing analytical theories and revealing the complex parameter space of hollow-beam lattices. We propose a simplified analytical model for solid-beam lattices that provides insight into the mechanisms behind their observed stiffness, and we investigate different hollow-beam lattice parameters that give rise to their aberrant properties. These experimental, computational and theoretical results uncover how architecture can be used to access unique lattice mechanical property spaces while demonstrating the practical limits of existing beam-based models in characterizing their behavior.

Additional Information

© 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc. Received 15 December 2016, Revised 25 July 2017, Accepted 23 August 2017, Available online 26 August 2017. JRG gratefully acknowledges the financial support of DoD through the Vannevar-Bush Fellowship, of Amgen through A.M.'s graduate fellowship (Funding Source Award No: 12520032) , and DARPA's MCMA program (Contract no.W91CRB-10-0305). D.M.K. and C.M.P. acknowledge support from the Office of Naval Research through grant no. N00014-16-1-2431. The authors thank Alex Zelhofer for computational support. The authors thank Sergio Pellegrino and Yuchen Wei for their support in conducting macroscopic truss compression experiments.

Attached Files

Supplemental Material - mmc1.docx


Files (4.6 MB)
Name Size Download all
4.6 MB Download

Additional details

August 21, 2023
October 17, 2023