20.500.12556/DKUM-87073 Dynamic characterisation of novel three-dimensional axisymmetric chiral auxetic structure 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. axisymmetric chiral structure auxetic chiral unit cell impact testing dynamic characterisation finite element simulations osno-simetrične kiralne strukture avksentični metamateriali kiralna enota celice udarno preizkušanje karakterizacija dinamike simulacije metod končnih elementov true false true Elsevier https://www.mdpi.com/2071-1050/15/24/16889 Angleški jezik Slovenski jezik Članek v reviji 2024-02-15 10:16:34 2024-02-15 10:16:34 2024-03-20 03:43:15 0000-00-00 00:00:00 2024 0 0 10 str. Vol. 333 (117949) April 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-01-05 2024-01-29 2024-02-01 539.2:004.94 185592323 10.1016/j.compstruct.2024.117949 0263-8223 1-s2.0-S0263822324000771-main.pdf 1-s2.0-S0263822324000771-main.pdf 1 D95824071BAAB0289B6CA2D1B09C1DA7 a19bb87a8d475125ec04fd1d95058d2f897b428d95a8d1cfe25944c1b5646417 1be978f9-e5f6-11ee-8d81-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=177090 https://www.sciencedirect.com/science/article/pii/S0263822324000771?via%3Dihub 0 6fb1c3fb-cbe3-11ee-be42-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=176177 Fakulteta za strojništvo 0 0 0