Experimental evidence of Willis coupling in a one-dimensional effective material element.

ABSTRACT: The primary objective of acoustic metamaterial research is to design subwavelength systems that behave as effective materials with novel acoustical properties. One such property couples the stress-strain and the momentum-velocity relations. This response is analogous to bianisotropy in electromagnetism, is absent from common materials, and is often referred to as Willis coupling after J.R., Willis, who first described it in the context of the dynamic response of heterogeneous elastic media. This work presents two principal results: first, experimental and theoretical demonstrations, illustrating that Willis properties are required to obtain physically meaningful effective material properties resulting solely from local behaviour of an asymmetric one-dimensional isolated element and, second

SUBMITTER: Muhlestein MB 

PROVIDER: S-EPMC5474687 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature