Titolo:  Numerical and experimental eigenmode analysis of low porosity auxetic structures
Autori: 
Data di pubblicazione:  2017
Autori:  Francesconi, Luca; Taylor, M; Bertoldi, K; Baldi, Antonio
Presenza coautori internazionali: 
Lingua:  Inglese
Titolo del libro:  Advancement of Optical Methods in Experimental Mechanics, Volume 3: Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanicsenspace
ISBN:  978-3-319-41600-7
Editore:  Springer
Tutti i curatori:  Sanichiro Yoshida, Luciano Lamberti, Cesar Sciammarella
Sezione:  Contributo
Volume:  3
Pagina iniziale:  335
Pagina finale:  341
Numero di pagine:  7
Digital Object Identifier (DOI):  http://dx.doi.org/10.1007/978-3-319-41600-7_42
Codice identificativo Scopus:  2-s2.0-84988727202
Codice identificativo ISI:  WOS:000392264400042
URL:  http://www.springer.com/series/8922
Revisione (peer review):  Comitato scientifico
Nome del convegno:  SEM International Congress and Exposition On Experimental and Applied Mechanics
Periodo del convegno:  6-9 giugno 2016
Luogo del convegno:  Orlando, USA
Abstract:  This study presents an evaluation of the mechanical behaviour of low porosity, ductile auxetic structures. Using time-averaged speckle interferometry and a specific experimental set-up, the eigenmodes and displacement fields of three low-porosity metallic auxetic samples were assessed and compared with the numerical simulations obtained using the commercial software Abaqus/Standard (Simulia Providence, RI). Guided by the finite element predictions, the eigenmode analysis was carried out by vibrating the specimens—each characterized by a different pore geometry—from 100 Hz to about 10 kHz analysing the structural response. A good agreement between the numerical calculations and the experimental results was found. This study not only validates the numerical-experimental approach used to analyse materials, but also to open a way to test and validate the performances of negative Poisson’s ratio structures and meta-materials in general applications. Furthermore, the findings of this work provides a new convincing and reliable experimental data, enlarge the knowledge about the elastic instabilities in metallic auxetic structures, supporting their use in critical applications.
Tipologia: 4.1 Contributo in Atti di convegno

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