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Acoustic properties of porous microlattices from effective medium to scattering dominated regimes

Krödel, Sebastian and Palermo, Antonio and Daraio, Chiara (2018) Acoustic properties of porous microlattices from effective medium to scattering dominated regimes. Journal of the Acoustical Society of America, 144 (1). pp. 319-329. ISSN 0001-4966. https://resolver.caltech.edu/CaltechAUTHORS:20180724-125220277

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Abstract

Microlattices are architected materials that allow for an unprecedented control of mechanical properties (e.g., stiffness, density, and Poisson's coefficient). In contrast to their quasi-static mechanical properties, the acoustic properties of microlattices remain largely unexplored. This paper analyzes the acoustic response of periodic millimeter-sized microlattices immersed in water using experiments and numerical simulations. Microlattices are fabricated using high-precision stereolithographic three-dimensional printing in a large variety of porosities and lattice topologies. This paper shows that the acoustic propagation undergoes a frequency dependent transition from a classic poroelastic behaviour that can be described by Biot's theory to a regime that is dominated by scattering effects. Biot's acoustic parameters are derived from direct simulations of the microstructure using coupled fluid and solid finite elements. The wave speeds predicted with Biot's theory agree well with the experimental measures. Within the scattering regime, the signals show a strong attenuation and dispersion, which is characterized by a cut-off frequency. The strong dispersion results in a frequency dependent group velocity. A simplified model of an elastic cylindrical scatterer allows predicting the signal attenuation and dispersion observed experimentally. The results in this paper pave the way for the creation of microlattice materials for the control of ultrasonic waves across a wide range of frequencies.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1121/1.5046068DOIArticle
ORCID:
AuthorORCID
Krödel, Sebastian0000-0002-9218-8578
Palermo, Antonio0000-0001-9431-0461
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2018 Acoustical Society of America. Received 13 October 2017; revised 13 June 2018; accepted 24 June 2018; published online 24 July 2018. Funding for this research was provided by the Swiss National Science Foundation, Grant No. 164375.
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)164375
Subject Keywords:Materials; Electrical properties; Ultrasonics; Acoustic analysis; Porous media; Acoustic wave propagation; Lattice dynamics; Acoustic signal processing; Acoustical properties
Issue or Number:1
Record Number:CaltechAUTHORS:20180724-125220277
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180724-125220277
Official Citation:Acoustic properties of porous microlattices from effective medium to scattering dominated regimes. Sebastian Krödel, Antonio Palermo, Chiara Daraio. The Journal of the Acoustical Society of America 2018 144:1, 319-329
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88191
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jul 2018 20:27
Last Modified:03 Oct 2019 20:04

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