Journal
ADVANCED ENGINEERING MATERIALS
Volume 23, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202000669
Keywords
additive manufacturing; auxetic metamaterials; split Hopkinson pressure bar; strain rate sensitivity; thermomechanical behavior
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Funding
- Operational Programme Research, Development and Education in the project INAFYM [CZ.02.1.01/0.0/0.0/16_019/0000766]
- Czech Science Foundation [19-23675S]
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The study focuses on metamaterials produced using additive manufacturing, revealing their strong dependence on initial temperature and strain rate for both stress-strain response and crushing behavior.
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.
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