Material property extraction procedure for electromomentum coupled metamaterials
type: CreativeWork
description: Electromomentum (Eμ) coupling is a material response that couples the macroscopically observable time-varying electric field to the momentum of the material. This unique behavior has been shown theoretically to result from dynamics at subwavelength length-scales due to asymmetries in heterogeneous piezoelectric materials. Electromomentum coupling is of interest to the engineering and scientific community for its ability to simultaneously sense both the acoustic pressure and particle velocity at a single point in space, thus enabling the creation of vector sensor devices using a single material. This thesis presents a study of the characterization of this novel transduction behavior through multiscale models and numerical experiments. The material models include analytical and finite element methods that extend the work of Pernas-Salomón et al. [Wave Motion, 106, 102797, (2021)]. The models simultaneously provide insight into the subwavelength behavior that leads to Eμ coupling on the macroscopic scale as well as metrics of the coupling strength. Additionally, these models are employed in a design strategy to maximize Eμ coupling demonstrated by a heterogeneous piezoelectric scatterer using readily available materials and easily manufactured geometries. To achieve this, a series of candidate designs are modeled and their Willis and/or Eμ coupling is quantified. The models are then employed to design an experimental method to characterize Eμ coupling of a sample using a water-filled impedance tube. The impedance tube measurement procedure presented in this work is a generalization of existing methods used to infer the frequency-dependent material properties of a sample from measurements of its scattering coefficients and associated property extraction algorithms. Namely, the works of Song and Bolton to measure the complex impedance and wavenumber or phase speed and attenuation [J. Acoust. Soc. Am., 107(3), pp. 1131-1152, (2000)], Fokin et al. to measure the complex-va…
abstract: Electromomentum (Eμ) coupling is a material response that couples the macroscopically observable time-varying electric field to the momentum of the material. This unique behavior has been shown theoretically to result from dynamics at subwavelength length-scales due to asymmetries in heterogeneous piezoelectric materials. Electromomentum coupling is of interest to the engineering and scientific community for its ability to simultaneously sense both the acoustic pressure and particle velocity at a single point in space, thus enabling the creation of vector sensor devices using a single material. This thesis presents a study of the characterization of this novel transduction behavior through multiscale models and numerical experiments. The material models include analytical and finite element methods that extend the work of Pernas-Salomón et al. [Wave Motion, 106, 102797, (2021)]. The models simultaneously provide insight into the subwavelength behavior that leads to Eμ coupling on the macroscopic scale as well as metrics of the coupling strength. Additionally, these models are employed in a design strategy to maximize Eμ coupling demonstrated by a heterogeneous piezoelectric scatterer using readily available materials and easily manufactured geometries. To achieve this, a series of candidate designs are modeled and their Willis and/or Eμ coupling is quantified. The models are then employed to design an experimental method to characterize Eμ coupling of a sample using a water-filled impedance tube. The impedance tube measurement procedure presented in this work is a generalization of existing methods used to infer the frequency-dependent material properties of a sample from measurements of its scattering coefficients and associated property extraction algorithms. Namely, the works of Song and Bolton to measure the complex impedance and wavenumber or phase speed and attenuation [J. Acoust. Soc. Am., 107(3), pp. 1131-1152, (2000)], Fokin et al. to measure the complex-va…
author: Casali, Matthew A.
language: en
keywords: Impedance tube, Metamaterial, Finite element method, Electromomentum, Piezoelectric
date published: 2023-08
date modified: 2026-07-24T05:01:02Z
provider: University of Texas
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: The University of Texas at Austin

PropertyValue
property ID: Handle
value: https://hdl.handle.net/2152/124877

PropertyValue
property ID: DOI
value: 10.26153/tsw/51479