Design of continuously graded elastic acoustic cloaks.

Journal Article (Journal Article)

This letter demonstrates the design of continuously graded elastic cylinders to achieve passive cloaking from harmonic acoustic excitation, both at single frequencies and over extended bandwidths. The constitutive parameters in a multilayered, constant-density cylinder are selected in a partial differential equation-constrained optimization problem, such that the residual between the pressure field from an unobstructed spreading wave in a fluid and the pressure field produced by the cylindrical inclusion is minimized. The radial variation in bulk modulus appears fundamental to the cloaking behavior, while the shear modulus distribution plays a secondary role. Such structures could be realized with functionally-graded elastic materials.

Full Text

Duke Authors

Cited Authors

  • Sanders, C; Aquino, W; Walsh, T

Published Date

  • January 2018

Published In

Volume / Issue

  • 143 / 1

Start / End Page

  • EL31 -

PubMed ID

  • 29390786

Electronic International Standard Serial Number (EISSN)

  • 1520-8524

International Standard Serial Number (ISSN)

  • 0001-4966

Digital Object Identifier (DOI)

  • 10.1121/1.5019699

Language

  • eng