PSI - Issue 47

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 47 (2023) 274–281

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Abstract Pentamodes metamaterials are lattice structures with peculiar properties. Their main characteristic is the low ratio of bulk to shear strength, which make them suitable for antiseismic design, bioengineering and aerospace applications. At first, analyses of pentamode structures under static conditions have been performed. Due to wave propagation in structures, an investigation taking into consideration the harmonical nature of waves should be made. In this study a computational analysis, via the finite element method takes place in order to analyze the shear strength of pentamodes under harmonical loading conditions. The frequency band of the harmonical loading is between 0Hz to 10 Hz, which is the band of seismic waves. Special investigation is also made for frequency bands between 0Hz and 2Hz where the more catastrophic phenomena occurred. Finally in our study, the shear and the bulk strengths of pentamode structures are numerically calculated under harmonical loading conditions for different frequency bands. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: computational analysis; dynamic analyses; metamaterials; pentamodes structures; finite element analysis 1. Introduction Mechanical metamaterials are materials with peculiar mechanical properties particularly characterizing by zero or negative Poisson ratio (Kadic et al. (2012)). Pentamodes are lattice structures, and they are composed by rods. Their main characteristic is the low ratio of shear to bulk strength. In addition, they appear bandgaps, frequency bands 27th International Conference on Fracture and Structural Integrity (IGF27) Dynamic Computational Analyses of Pentamodes Structures Panagiotis N. Lymperopoulos a, *, Efstathios E. Theotokoglou a, * a Department of Mechanics, Laboratory of Testing and Materials, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, 5, Heroes of Polytechnion Avenue, Theocaris Building Zografou Campus, PO Box 157 73 Athens, Greece

* Corresponding author. Tel.: +30-210-772-1303 ; fax: +30-210-772-1302. E-mail address: panagiotislymperopoulos@mail.ntua.gr; stathis@central.ntua.gr

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 10.1016/j.prostr.2023.07.098