PSI - Issue 26

Available online at www.sciencedirect.com StructuralIntegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 26 (2020) 263–268

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Met materials technol gy for antiseismic design has been under investigation over the r cent years. Metamaterials are designed to have similar behavior with isolators, now used for antiseismic design, but without the ageing fect that appears to isola ors. The aim of this wo k is to study metamaterials regarding their use in antiseismic design. There ore, a finit elem nt method approach in static problems is presented, using metamaterials. Another int resting pr blem is th failure of metam terials under combined loading. From our analysis it results the optimum pentamodes dimensions in order to prevent pentamodes from fracture. © 2020 The Authors. Published by Elsevier .V. This is an ope acces article under th CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Metamaterials technology for antiseismic design has been under investigation over the recent years. Metamaterials are designed to have similar behavior with isolators, now used for antiseismic design, but without the ageing effect that appears to isolators. The aim of this work is to study metamaterials regarding their use in antiseismic design. Therefore, a finite element method approach in static problems is presented, using metamaterials. Another interesting problem is the failure of metamaterials under combined loading. From our analysis it results the optimum pentamodes dimensions in order to prevent pentamodes from fracture. 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an ope acces article under th CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers In addition, metamaterials appear to have band gap, waves with frequency inside this band cannot propagate through the metamaterial (Chronopoulos et.al. (2015)), (Sapountzakis et.al. (2015)). This phenomenon is under investigation in order to use metamaterials for antiseismic design. Metamaterials is a subset of the broad family of Composite Materials. They are designed to have properties that can not be found in natural materials (p.s. negative Poisson ratio or negative electric and magnetic coefficient). First implementation of metamaterials appears on aircrafts’ antennas (Capolino F. (2009)). The usage of metamaterials has contributed to reduce the size of antennas and their tune in a strict defined band. In addition, metamaterials appear to have band gap, waves with frequency inside this band cannot propagate through the metamaterial (Chronopoulos et.al. (2015)), (Sapountzakis et.al. (2015)). This phenomenon is under investigation in order to use metamaterials for antiseismic design. Metamaterials is a s bset of the broad family of Composite Materials. Th y are designed to have properties that can not be fou d in natural materials (p.s. neg tive Poisson ratio or negative electric and magnetic coefficient). First implementation f metamaterials appears on aircrafts’ a tennas (Capolino F. (2009)). The usage of metamaterials has contributed to reduce the size of antennas and their tune in a strict defined band. The1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Computational analysis of pentamode metamaterials for antiseismic design Panagiotis N. Lymperopoulos a, ∗ , Efstathios E. Theotokoglou a, ∗ a School of Applied Mathematical and Physical Sciences Department of Mechanics Laboratory of Testing and Materials National Technical University of Athens Zographou Campus, Theocaris Bld, GR-157 73, Athens, Greece The1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Computational analysis of pentamode metamaterials for antiseismic design Panagiotis N. Lymperopoulos a, ∗ , Efstathios E. Theotokoglou a, ∗ a School of Applied Mathematical and Physical Sciences Depart ent of Me hanics Laboratory of Testi g and Materials National Technical University of Athens Zographou Campus, Theocaris Bld, GR-157 73, Athens, Greece Abstract Abstract Peer-review under responsibility of MedFract1 organizers Keywords: Type your keywords here, separated by semicolons ; P er-review under responsibility of MedFract1 organizers Keywords: Type your keywords here, separated by semicolons ; 1. Introduction 1. Introduction

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of MedFract1 organizers 10.1016/j.prostr.2020.06.033