Dynamic characterisation of novel three-dimensional axisymmetric chiral auxetic structure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F24%3A00373283" target="_blank" >RIV/68407700:21260/24:00373283 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.compstruct.2024.117949" target="_blank" >https://doi.org/10.1016/j.compstruct.2024.117949</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.compstruct.2024.117949" target="_blank" >10.1016/j.compstruct.2024.117949</a>

Result language

angličtina

Original language name

Dynamic characterisation of novel three-dimensional axisymmetric chiral auxetic structure

Original language description

The study presents an extensive mechanical and computational characterisation of novel cellular metamaterial with axisymmetric chiral structure (ACS) at different strain rates. The Direct Impact Hopkinson Bar (DIHB) testing device was used for impact testing up to 21 m/s striker speed, which was insufficient to reach the shock deformation regime. Thus, using computational simulations to estimate the structure behaviour at high strain rates was necessary. Experimental and computational results showed that all ACS structures exhibit a nominal stress–strain relationship typical for cellular materials. As the loading conditions shifted to a dynamic regime, the micro–inertia effect became increasingly pronounced, leading to a corresponding rise in structure stiffness. The Poisson's ratio in all ACS increases gradually, making them superior to traditional cellular materials, which experience a sudden increase in Poisson's ratio during loading. Additionally, the study found that the structures exhibited a rise in the auxetic effect with an increase in strain rate, highlighting the benefits of axisymmetric structures in high-loading regimes. Overall, the obtained results provide valuable insights into the mechanical properties of ACS under different loading regimes and will contribute to further design improvements and the fabrication of novel ACS metamaterials.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GM22-18033M" target="_blank" >GM22-18033M: High velocity impact dynamics with fast and flash X-ray radiography</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Composite Structures

ISSN

0263-8223

e-ISSN

1879-1085

Volume of the periodical

333

Issue of the periodical within the volume

Duben

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

1-10

UT code for WoS article

001180869000001

EID of the result in the Scopus database

2-s2.0-85184138780