English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this paper we propose the first estimate of some elastic parameters of therelaxed micromorphic model on the basis of real experiments of transmission oflongitudinal plane waves across an interface separating a classical Cauchymaterial (steel plate) and a phononic crystal (steel plate with fluid-filledholes). A procedure is set up in order to identify the parameters of our modelby superimposing the experimentally-based profile of the reflection coefficient(plotted as function of the frequency of the traveling waves) with theanalogous profile obtained via simulations based upon the relaxed micromorphicmodel. We end up with the determination of 5 out of 6 constitutive parameterswhich are featured by the relaxed micromorphic model in the isotropic case,plus the determination of the micro-inertia parameter. The sixth elasticparameter, namely the Cosserat couple modulus $\mu_{c}$, still remainsundetermined, since experimental data concerning the transmission properties ofthe considered interface for transverse incident waves are not yet available. Afundamental result of the present paper is the estimate of the non-localityintrinsically associated to the underlying microstructure of the metamaterial.As a matter of fact, we appraise that the characteristic length $L_{c}$measuring the non-locality of the considered phononic crystal is of the orderof $1/3$ of the diameter of the considered fluid-filled holes.

First evidence of non-locality in real band-gap metamaterials: determining parameters in the relaxed micromorphic model