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research-article

HYBRID HOLLOW MICROLATTICES WITH UNIQUE COMBINATION OF STIFFNESS AND DAMPING

[+] Author and Article Information
Ladan Salari-Sharif

Mechanical and Aerospace Engineering Department, University of California, Irvine, CA, USA
lsalaris@uci.edu

Tobias Schaedler

Sensors and Materials Lab, HRL Laboratories, LLC, Malibu, CA, USA
taschaedler@hrl.com

Lorenzo Valdevit

Mechanical and Aerospace Engineering Department, University of California, Irvine, CA, USA
valdevit@uci.edu

1Corresponding author.

ASME doi:10.1115/1.4038672 History: Received June 25, 2017; Revised October 11, 2017

Abstract

Hybrid micro-architected materials with unique combinations of high stiffness, high damping and low density are presented. We demonstrate a scalable manufacturing process to fabricate hollow microlattices with a sandwich wall architecture comprising an elastomeric core and metallic skins. In this configuration, the metallic skins provide stiffness and strength, whereas the elastomeric core provides constrained-layer damping. This damping mechanism is effective under any strain amplitude and at any relative density, in stark contrast with the structural damping mechanism exhibited by ultralight metallic or ceramic architected materials, which requires large strain and densities lower than a fraction of a percent. We present an analytical model for stiffness and constrained-layer damping of hybrid hollow microlattices, and verify it with Finite Elements simulations and experimental measurements. Subsequently, this model is adopted in optimal design studies to identify hybrid microlattice geometries which provide ideal combinations of high stiffness and damping and low density. Finally, a previously derived analytical model for structural damping of ultralight metallic microlattices is extended to hybrid lattices, and used to show that ultralight hybrid designs are more efficient than purely metallic ones.

Copyright (c) 2017 by ASME
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