Kathryn H. Matlack
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View article: SHIELDING BUILDINGS FROM SURFACE WAVES WITH “SEISMIC METASTRUCTURES”
SHIELDING BUILDINGS FROM SURFACE WAVES WITH “SEISMIC METASTRUCTURES” Open
Phononic crystals and metamaterials constitute a broad class of artificially engineered materials able to manipulate the propagation of acoustic/elastic waves at different lengths scale. Filtering and directivity properties of these materi…
View article: On the effective magnetostrictive properties of anisotropic magneto-active elastomers in the small-deformation limit
On the effective magnetostrictive properties of anisotropic magneto-active elastomers in the small-deformation limit Open
Magneto-active elastomers (MAEs) are composite materials comprising an elastomer matrix with embedded magnetic particles, endowing the composite with coupled effective magneto-mechanical responses. It is widely reported that anisotropic MA…
View article: Subwavelength topological interface modes in a multilayered vibroacoustic metamaterial
Subwavelength topological interface modes in a multilayered vibroacoustic metamaterial Open
We present a systematic and rigorous analytical approach, based on the transfer matrix methodology, to study the existence, evolution, and robustness of subwavelength topological interface states in practical multilayered vibroacoustic pho…
View article: A Quantitative Study of Energy Localization Characteristics in Defect-embedded Phononic Crystals
A Quantitative Study of Energy Localization Characteristics in Defect-embedded Phononic Crystals Open
Phononic crystals (PnCs) are periodic engineered media that can customize the spatio-temporal characteristics of mechanical energy propagation. PnCs that additionally leverage precisely embedded defects can achieve robust energy localizati…
View article: Subwavelength topological interface modes in a multilayered vibroacoustic metamaterial
Subwavelength topological interface modes in a multilayered vibroacoustic metamaterial Open
We present a systematic and rigorous analytical approach, based on the transfer matrix methodology, to study the existence, evolution, and robustness of subwavelength topological interface states in practical multilayered vibroacoustic pho…
View article: Sub-Bragg Phenomena in Multilayered Vibroacoustic Phononic Metamaterials
Sub-Bragg Phenomena in Multilayered Vibroacoustic Phononic Metamaterials Open
Beyond classical Bragg diffraction, we report on new sub-Bragg phenomena to achieve enhanced sound wave tunability in the low-frequency range in a multilayered acoustic metamaterial system. Remarkably, we reveal and study the formation of …
View article: Analytical Study of a Monolayered Vibroacoustic Metamaterial
Analytical Study of a Monolayered Vibroacoustic Metamaterial Open
This study investigates a vibroacoustic phononic metamaterial system composed of repeated monolayered membrane-air cavity unit-cells to assess its efficacy in controlling sound waves. Assuming low-frequency axisymmetric modes, the coupled …
View article: Physics-informed machine learning for the inverse design of wave scattering clusters
Physics-informed machine learning for the inverse design of wave scattering clusters Open
Clusters of wave-scattering oscillators offer the ability to passively control wave energy in elastic continua. However, designing such clusters to achieve a desired wave energy pattern is a highly nontrivial task. While the forward scatte…
View article: Physics-Informed Machine Learning for the Inverse Design of Wave Scattering Clusters
Physics-Informed Machine Learning for the Inverse Design of Wave Scattering Clusters Open
Clusters of wave-scattering oscillators offer the ability to passively control wave energy in elastic continua. However, designing such clusters to achieve a desired wave energy pattern is a highly nontrivial task. While the forward scatte…
View article: Harmonic balance formulation for nonlinear wave-scattering clusters
Harmonic balance formulation for nonlinear wave-scattering clusters Open
Nonlinear oscillators can be used as a scattering mechanism to passively manipulate propagating elastic waves in an energy-dependent manner. However, the interaction of incident elastic waves with clusters of discrete nonlinear oscillators…
View article: Characteristics of truncation resonances in periodic bilayer rods and beams with symmetric and asymmetric unit cells
Characteristics of truncation resonances in periodic bilayer rods and beams with symmetric and asymmetric unit cells Open
Truncation resonances are resonant frequencies that occur within bandgaps and are a prominent feature of finite phononic crystals. While recent studies have shed light on the existence conditions and modal characteristics of truncation res…
View article: Wavenumber Scattering and Inter-band Targeted Energy Transfer in Phononic Lattices with Local Vibro-Impact Nonlinearities
Wavenumber Scattering and Inter-band Targeted Energy Transfer in Phononic Lattices with Local Vibro-Impact Nonlinearities Open
We propose a method for manipulating wave propagation in phononic lattices by employing local vibro-impact (VI) nonlinearities to \textit{scatter} energy across the underling linear band structure of the lattice, and \textit{transfer} ener…
View article: A Modal Decomposition Approach to Topological Wave Propagation
A Modal Decomposition Approach to Topological Wave Propagation Open
The characteristics of topologically protected wave propagation is typically predicted via the band structure of the primitive unit cell, using Berry curvature to predict localized interface or boundary states (as well as their degree of l…
View article: Topology Optimization of Manufacturable Photonic Crystals With Complete Bandgaps [Dissertation]
Topology Optimization of Manufacturable Photonic Crystals With Complete Bandgaps [Dissertation] Open
Periodic structures consisting of dielectric material, i.e. photonic crystals, are capable of prohibiting electromagnetic waves within frequency ranges referred to as bandgaps. This principle was first demonstrated with alternating slabs o…
View article: In situ nonlinear Rayleigh wave technique to characterize the tensile plastic deformation of stainless steel 316L
In situ nonlinear Rayleigh wave technique to characterize the tensile plastic deformation of stainless steel 316L Open
The acoustic nonlinearity parameter(beta) is sensitive to dislocation parameters, which continuously change during plastic deformation. Dislocation-based damage in structures/components is the source of the failure; thus, beta has been stu…
View article: Topological protection in a strongly nonlinear interface lattice
Topological protection in a strongly nonlinear interface lattice Open
Mechanical topological insulators are well understood for linear and weakly nonlinear systems, however traditional analysis methods break down for strongly nonlinear systems since linear methods can not be applied in that case. We study on…
View article: “Fuzzy Band Gaps”: A Physically Motivated Indicator of Bloch Wave Evanescence in Phononic Systems
“Fuzzy Band Gaps”: A Physically Motivated Indicator of Bloch Wave Evanescence in Phononic Systems Open
Phononic crystals (PCs) have been widely reported to exhibit band gaps, which for non-dissipative systems are well defined from the dispersion relation as a frequency range in which no propagating (i.e., non-decaying) wave modes exist. How…
View article: Effective phononic crystals for non-Cartesian elastic wave propagation
Effective phononic crystals for non-Cartesian elastic wave propagation Open
We introduce the concept of effective phononic crystals, which combine\nperiodicity with varying isotropic material properties to force periodic\ncoefficients in the elastic equations of motion in a non-Cartesian basis.\nPeriodic coefficie…
View article: Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials
Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials Open
Lattice materials provide unusual thermal and vibrational properties but not within the same structure. Thermal and vibrational multifunctionality is, however, crucial for thermomechanical applications such as automotive, aerospace, buildi…
View article: On the Interrelationship Between Static and Vibration Mitigation Properties of Architected Metastructures
On the Interrelationship Between Static and Vibration Mitigation Properties of Architected Metastructures Open
Continuous demand for improvement of material performance in structural applications pushes the need for materials that are able to fulfill multiple functions. Extensive work on effective static properties of different architected material…
View article: Hybridization of Guided Surface Acoustic Modes in Unconsolidated Granular Media by a Resonant Metasurface
Hybridization of Guided Surface Acoustic Modes in Unconsolidated Granular Media by a Resonant Metasurface Open
We investigate the interaction of guided surface acoustic modes (GSAMs) in unconsolidated granular media with a metasurface, consisting of an array of vertical oscillators. We experimentally observe the hybridization of the lowest-order GS…
View article: Designing Perturbative Metamaterials from Discrete Models: From Veselago lenses to topological insulators
Designing Perturbative Metamaterials from Discrete Models: From Veselago lenses to topological insulators Open
Discrete models provide concise descriptions of complex physical phenomena, such as negative refraction, topological insulators, and Anderson localization. While there are multiple tools to obtain discrete models that demonstrate particula…
View article: Composite 3D-printed metastructures for low-frequency and broadband vibration absorption
Composite 3D-printed metastructures for low-frequency and broadband vibration absorption Open
Significance Architected material used to control elastic wave propagation has thus far relied on two mechanisms for forming band gaps, or frequency ranges that cannot propagate: ( i ) Phononic crystals rely on their structural periodicity…