Title: Numerical modelling of a composite pentamode comprising a shear-thickening fluid

Authors: Federico Cecchini; Valeria Cherubini; Francesco Fabbrocino; Francesca Nanni

Addresses: Department of Enterprise Engineering, University of Rome Tor Vergata, Via del Politecnico, 1, 00133 Rome, Italy ' Department of Enterprise Engineering, University of Rome Tor Vergata, Via del Politecnico, 1, 00133 Rome, Italy ' Department of Civil Engineering, Pegaso University, Piazza Trieste E Trento, 48, 80132 Naples, Italy ' Department of Enterprise Engineering, University of Rome Tor Vergata, Via del Politecnico, 1, 00133 Rome, Italy

Abstract: In this work, we developed a novel numerical approach to the analysis of the displacement field of a Composite pentamode metamaterial. Two different approaches to the solution of the system of equations are taken into account: the first is an exact iterative approach, the second is a discrete one based on finite element modelling (FEM). The single beam elements that materialise the composite pentamode are hollow and comprise a Non-Newtonian fluid (NNF) Core. In particular, shear-thickening fluids (STFs) were selected as the materials for the core, as they are capable of converting into heat a large quantity of the kinetic energy deriving from the dynamic forces applied to the structure. In order to study the viscoelastic properties of the material considered, a two-step rheological analysis was carried out. Finally, the previous equations were solved and the results obtained for the various methods were compared.

Keywords: pentamode; seismic; metamaterial; STFs; shear-thickening fluids; constrained layer damping; FEM; finite element modelling; viscoelastic damping.

DOI: 10.1504/IJMRI.2018.093478

International Journal of Masonry Research and Innovation, 2018 Vol.3 No.3, pp.223 - 243

Received: 28 Aug 2017
Accepted: 27 Oct 2017
Published online: 26 Jul 2018 *

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