June 11th - June 14th, 2023
Telč, Czech Republic
| Nejc Novak |
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| Faculty of Mechanical Engineering, University of Maribor |
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Dr. Nejc Novak is an assistant professor at the Faculty of Mechanical Engineering, University of Maribor, Slovenia. His research interest is in advanced computational modelling and simulations, cellular structures, auxetic cellular materials, characterisation and optimisation of cellular structures, multi-physical problems, crashworthiness, blast and ballistic loading. Nejc Novak was promoted to Doctor of Philosophy in 2019 at the University of Maribor, Slovenia with thesis title “Computational simulations of auxetic cellular structures”. His bibliography comprises of more than 130 bibliographical units, from which is more than 30 original scientific papers published mostly in high ranked journals in the field of composites and mechanics. He was the visiting researcher at the University of Kumamoto, Japan, at the Georgia Institute of Technology, USA, at the Beijing Institute of Technology, China, New York University Abu Dhabi, UAE as well as at the Politecnico di Milano, Italy, where he was appointed as visiting professor in 2021.
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COMPUTATIONAL AND EXPERIMENTAL MECHANICAL CHARACTERISATION OF MODERN CELLULAR METAMATERIALS AT DIFFERENT STRAIN RATES |
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The engineered materials with designed and tuneable multifunctional properties are often called the "metamaterials" and in this lecture, we will address the materials with internal cellular structure - the "cellular metamaterial" [1]. The cellular metamaterials have been increasingly used in modern engineering applications over the past decade due to their attractive combination of improved mechanical and thermal properties relative to their weight. This work presents a detailed overview of the fabrication processes of cellular metamaterials, their exhibited properties, and potential applications. The advanced geometrical characterisation, experimental testing and computational modelling of various cellular metal structures (closed-cell foam, open-cell foam, auxetic cellular structure, UniPore structure, foam-filled tube and TPMS structure) will be described in detail. The mechanical behaviour of cellular structures under quasi-static and low- and high-rate dynamic loading conditions, which were thoroughly investigated both computationally and experimentally, will be presented [2]. The high strain rate loading of cellular metamaterials using the Split Hopkinson Pressure Bar (SHPB) and powder gun will also be discussed. Furthermore, the use of high speed cameras and Digital Image Correlation (DIC) to analyse the deformation behaviour will be presented on practical examples of modern metamaterials. The used methodology, main results and relevant conclusions will be discussed.
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| [1] L. J. Gibson and M. F. Ashby: Cellular Solids: Structure and properties. Cambridge University Press, Cambridge, 1997. |
| [2] N. Novak et al.: Impact loading of additively manufactured metallic stochastic sheet-based cellular material. International Journal of Impact Engineering, 2023. |
