Poroelastic microlattices for underwater wave focusing
Name
Poroelastic_microlattices_for_underwater_wave_focusing.pdf
Size
34.36 MB
Format
Adobe PDF
Checksum (MD5)
d8762ca53949f89ac0d6225d474021ee
Author(s)
Kim, Gunho
Portela, Carlos M.
Celli, Paolo
Palermo, Antonio
Daraio, Chiara
Date Issued
November 2021
Journal
Extreme Mechanics Letters
Publisher
Elsevier BV
Citation
Kim, Gunho, Portela, Carlos M., Celli, Paolo, Palermo, Antonio and Daraio, Chiara. 2021. "Poroelastic microlattices for underwater wave focusing." Extreme Mechanics Letters, 49.
Version
Author's final manuscript
Abstract
Metamaterials with microscale architectures, e.g., microlattices, can exhibit extreme quasi-static mechanical response and tailorable acoustic properties. When coupled with pressure waves in surrounding fluid, the dynamic behavior of microlattices in the long wavelength limit can be explained in the context of Biot’s theory of poroelasticity. In this work, we exploit the elastoacoustic wave propagation within 3D-printed polymeric microlattices to incorporate a gradient of refractive index for underwater ultrasonic lensing. Experimentally and numerically derived dispersion curves allow the characterization of acoustic properties of a fluid-saturated elastic lattice. A modified Luneburg lens index profile adapted for underwater wave focusing is demonstrated via the finite element method and immersion testing, showcasing a computationally efficient poroelasticity-based design approach that enables accelerated design of acoustic wave manipulation devices. Our approach can be applied to the design of acoustic metamaterials for biomedical applications featuring focused ultrasound.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.eml.2021.101499
