Title: Approaches for Efficient Modeling of the Mechanical Response of Complex Periodic Truss Architectures
Authors: Carlos M. Portela, Gregory P. Phlipot, Julia R. Greer, and Dennis M. Kochmann
Abstract: With recent advances in additive manufacturing techniques, the ability to design the microstructure of macroscopic geometries have opened up the ability to create a new class of tunable metamaterials, including periodic truss lattices. While the experimentalists have the ability to manufacture and test truss lattices with various constituent materials, topologies, and relative densities undergoing various loading cases, the ability to predict the mechanical response of these lattices through simulation remains a challenge due in part to the non-slender nature of the manufacturable lattices. Further challenges are introduced by the computational expense associated with modeling these multiscale metamaterials, which might involve the simulation of millions of structural components. In this paper, we first explore how the properties of non-slender truss lattices differ from the slender lattice theory by performing experiments on moderate relative density truss lattices with changes in node geometry. Then we address both of the computational challenges by developing reduced order models of non-slender truss lattices and a computational framework built on the quasicontinuum (QC) method to reduce the computational cost of modeling periodic slender truss lattices consisting of a large number of truss members. We then outline how the reduced order models can be combined in the QC framework to model large non-slender lattices.
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Conference: SAMPE 2019 - Charlotte, NC
Publication Date: 2019/05/20
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