Failure analysis of auxetic lattice structures under crush load

Kadir Günaydin*, Giuseppe Sala, Halit S. Türkmen, Antonio Mattia Grande

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

Lattice structures are promising materials in the terms of energy absorption, acoustic and vibrational damping, high strength-to-weight ratios and thermal management capabilities. In particular, auxetic lattice structures, among others, show high energy absorption performances due to their characteristic negative Poisson's ratio. In this study, it is aimed to compare auxetic deformation mechanisms under quasi-static crush loads. Ti6Al4V tensile test specimens were produced with Electron Beam Melting (EBM) Additive Manufacturing (AM) technology. Moreover, a constitutive equation was derived and calibrated according to tensile results. The calibrated data were used to generate non-linear computational crush models including elastoplastic material data, damage initiation criterion, damage evaluation law and element deletion. The computational models are utilized for optimum topology design and mechanical performance prediction of different auxetic cells, including anti-tetrachiral, hexachiral, re-entrant and honeycomb lattice structures that are prone to prematurely fail under crush loading conditions. Consequently, it was found that the chiral auxetic deformation mechanism experienced better energy absorption ability over re-entrant deformation mechanism for metallic lattice structures.

Original languageEnglish
Pages (from-to)237-246
Number of pages10
JournalProcedia Structural Integrity
Volume35
Issue numberC
DOIs
Publication statusPublished - 2021
Event2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials, IWPDF 2021 - Ankara, Turkey
Duration: 18 Aug 202120 Aug 2021

Bibliographical note

Publisher Copyright:
© 2021 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 IWPDF 2021 Chair, Tuncay Yalçinkaya

Funding

This study is supported by Technological and Scientific Council of Turkey (TUBITAK) under Technology and Innovation Support Program (Grant Number: 5158001).

FundersFunder number
TUBITAK5158001
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

    Keywords

    • Auxetic lattice structures
    • Crush
    • Ductile damage
    • EBM
    • Ti6Al4V

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