Details
| Original language | English |
|---|---|
| Article number | 102318 |
| Number of pages | 11 |
| Journal | Extreme Mechanics Letters |
| Volume | 77 |
| Early online date | 27 Mar 2025 |
| Publication status | Published - Jun 2025 |
Abstract
Piezoelectric materials with asymmetric microstructures have emerged in elastodynamics as generalized Willis media to create an additional cross-coupling, termed electro-momentum coupling, which offers a new degree of freedom to manipulate mechanical waves. In this study, we present numerical simulations of the scattering of longitudinal waves in layered piezoelectric Willis metamaterials. Based on the asymmetry of reflection amplitudes due to the electro-momentum coupling, a topology optimization approach is employed to design a one-way zero reflection system with the introduction of material loss to control the asymmetric reflection amplitudes and embrace non-Hermitian physics. We conduct two topology optimization studies to design unit cells connected either with or without external electric control. The modeling of wave propagation shows the effects of both classical Willis coupling and electro-momentum coupling for each wave propagation study.
Keywords
- Material design, Metamaterials, Non-Hermitian physics, Unidirectional zero reflection, Willis materials
ASJC Scopus subject areas
- Chemical Engineering(all)
- Bioengineering
- Chemical Engineering(all)
- Chemical Engineering (miscellaneous)
- Engineering(all)
- Engineering (miscellaneous)
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Extreme Mechanics Letters, Vol. 77, 102318, 06.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effect of electro-momentum coupling on unidirectional zero reflection in layered generalized Willis Metamaterials
AU - Huynh, Hai D.
AU - Nanthakumar, S. S.
AU - Park, Harold S.
AU - Rabczuk, Timon
AU - Zhuang, Xiaoying
N1 - Publisher Copyright: © 2025
PY - 2025/6
Y1 - 2025/6
N2 - Piezoelectric materials with asymmetric microstructures have emerged in elastodynamics as generalized Willis media to create an additional cross-coupling, termed electro-momentum coupling, which offers a new degree of freedom to manipulate mechanical waves. In this study, we present numerical simulations of the scattering of longitudinal waves in layered piezoelectric Willis metamaterials. Based on the asymmetry of reflection amplitudes due to the electro-momentum coupling, a topology optimization approach is employed to design a one-way zero reflection system with the introduction of material loss to control the asymmetric reflection amplitudes and embrace non-Hermitian physics. We conduct two topology optimization studies to design unit cells connected either with or without external electric control. The modeling of wave propagation shows the effects of both classical Willis coupling and electro-momentum coupling for each wave propagation study.
AB - Piezoelectric materials with asymmetric microstructures have emerged in elastodynamics as generalized Willis media to create an additional cross-coupling, termed electro-momentum coupling, which offers a new degree of freedom to manipulate mechanical waves. In this study, we present numerical simulations of the scattering of longitudinal waves in layered piezoelectric Willis metamaterials. Based on the asymmetry of reflection amplitudes due to the electro-momentum coupling, a topology optimization approach is employed to design a one-way zero reflection system with the introduction of material loss to control the asymmetric reflection amplitudes and embrace non-Hermitian physics. We conduct two topology optimization studies to design unit cells connected either with or without external electric control. The modeling of wave propagation shows the effects of both classical Willis coupling and electro-momentum coupling for each wave propagation study.
KW - Material design
KW - Metamaterials
KW - Non-Hermitian physics
KW - Unidirectional zero reflection
KW - Willis materials
UR - http://www.scopus.com/inward/record.url?scp=105001485028&partnerID=8YFLogxK
U2 - 10.1016/j.eml.2025.102318
DO - 10.1016/j.eml.2025.102318
M3 - Article
AN - SCOPUS:105001485028
VL - 77
JO - Extreme Mechanics Letters
JF - Extreme Mechanics Letters
M1 - 102318
ER -