Impact behavior of additively manufactured stainless steel auxetic structures at elevated and reduced temperatures

0532678 - ÚTAM 2022 RIV DE eng J - Journal Article
Fíla, T. - Koudelka, P. - Falta, J. - Šleichrt, J. - Adorna, M. - Zlámal, P. - Neuhäuserová, M. - Mauko, A. - Valach, Jaroslav - Jiroušek, O.
Impact behavior of additively manufactured stainless steel auxetic structures at elevated and reduced temperatures.
Advanced Engineering Materials. Roč. 23, č. 1 (2021), č. článku 2000669. ISSN 1438-1656. E-ISSN 1527-2648
R&D Projects: GA MŠMT(CZ) EF16_019/0000766
Institutional support: RVO:68378297
Keywords : additive manufacturing * auxetic metamaterials * split Hopkinson pressure bar * strain rate sensitivity * thermomechanical behavior
OECD category: Materials engineering
Impact factor: 4.122, year: 2021
Method of publishing: Open access
https://doi.org/10.1002/adem.202000669

Metamaterials produced using additive manufacturing represent advanced structures with tunable properties and deformation characteristics. However, the manufacturing process, imperfections in geometry, properties of the base material as well as the ambient and operating conditions often result in complex multiparametric dependence of the mechanical response. As the lattice structures are metamaterials that can be tailored for energy absorption applications and impact protection, the investigation of the coupled thermomechanical response and ambient temperature‐dependent properties is particularly important. Herein, the 2D re‐entrant honeycomb auxetic lattice structures additively manufactured from powdered stainless steel are subjected to high strain rate uniaxial compression using split Hopkinson pressure bar (SHPB) at two different strain rates and three different temperatures. An in‐house developed cooling and heating stages are used to control the temperature of the specimen subjected to high strain rate impact loading. Thermal imaging and high‐speed cameras are used to inspect the specimens during the impact. It is shown that the stress–strain response as well as the crushing behavior of the investigated lattice structures are strongly dependent on both initial temperature and strain rate.
Permanent Link: http://hdl.handle.net/11104/0311099