Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates
The mechanical behaviour of three different auxetic cellular structures, hexa-chiral 2D, tetra-chiral 2D and tetra-chiral 3D, was experimentally investigated in this study. The structures were produced with the powder bed fusion method (PBF) from an austenitic stainless steel alloy. The fundamental...
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MDPI AG
2020-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/1/52 |
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| author | Anja Mauko Tomáš Fíla Jan Falta Petr Koudelka Václav Rada Michaela Neuhäuserová Petr Zlámal Matej Vesenjak Ondřej Jiroušek Zoran Ren |
| author_facet | Anja Mauko Tomáš Fíla Jan Falta Petr Koudelka Václav Rada Michaela Neuhäuserová Petr Zlámal Matej Vesenjak Ondřej Jiroušek Zoran Ren |
| author_sort | Anja Mauko |
| collection | DOAJ |
| description | The mechanical behaviour of three different auxetic cellular structures, hexa-chiral 2D, tetra-chiral 2D and tetra-chiral 3D, was experimentally investigated in this study. The structures were produced with the powder bed fusion method (PBF) from an austenitic stainless steel alloy. The fundamental material mechanical properties of the sample structures were determined with classic quasi-static compressive tests, where the deformation process was captured by a high-resolution digital camera. The Split Hopkinson Pressure Bar (SHPB) apparatus was used for dynamic impact testing at two impact velocities to study the strain-rate dependency of the structures. Two synchronised high-speed cameras were used to observe the impact tests. The captured images from both quasi-static and dynamic experiments were processed using a custom digital image correlation (DIC) algorithm to evaluate the displacement/strain fields and the Poisson’s ratio. Predominant auxetic behaviour was observed in all three structures throughout most of the deformation process both under quasi-static and impact loading regimes. The tetra-chiral 2D structure showed the most significant auxetic behaviour. Significant stress enhancement in all tested structures was observed in dynamic testing. The Poisson’s ratio strain-rate dependency was confirmed for all three auxetic structures. |
| first_indexed | 2024-03-10T13:42:24Z |
| format | Article |
| id | doaj.art-34d137aa0d4c4757b3dde12700399207 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:42:24Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-34d137aa0d4c4757b3dde127003992072023-11-21T02:53:35ZengMDPI AGMetals2075-47012020-12-011115210.3390/met11010052Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-RatesAnja Mauko0Tomáš Fíla1Jan Falta2Petr Koudelka3Václav Rada4Michaela Neuhäuserová5Petr Zlámal6Matej Vesenjak7Ondřej Jiroušek8Zoran Ren9Faculty of Mechanical Engineering, University of Maribor, Smetanova ul. 17, 2000 Maribor, SloveniaDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicFaculty of Mechanical Engineering, University of Maribor, Smetanova ul. 17, 2000 Maribor, SloveniaDepartment of Mechanics and Materials, Faculty of Transportation Sciences, Czech Technical University in Prague, Konviktská 20, 110 00 Prague, Czech RepublicFaculty of Mechanical Engineering, University of Maribor, Smetanova ul. 17, 2000 Maribor, SloveniaThe mechanical behaviour of three different auxetic cellular structures, hexa-chiral 2D, tetra-chiral 2D and tetra-chiral 3D, was experimentally investigated in this study. The structures were produced with the powder bed fusion method (PBF) from an austenitic stainless steel alloy. The fundamental material mechanical properties of the sample structures were determined with classic quasi-static compressive tests, where the deformation process was captured by a high-resolution digital camera. The Split Hopkinson Pressure Bar (SHPB) apparatus was used for dynamic impact testing at two impact velocities to study the strain-rate dependency of the structures. Two synchronised high-speed cameras were used to observe the impact tests. The captured images from both quasi-static and dynamic experiments were processed using a custom digital image correlation (DIC) algorithm to evaluate the displacement/strain fields and the Poisson’s ratio. Predominant auxetic behaviour was observed in all three structures throughout most of the deformation process both under quasi-static and impact loading regimes. The tetra-chiral 2D structure showed the most significant auxetic behaviour. Significant stress enhancement in all tested structures was observed in dynamic testing. The Poisson’s ratio strain-rate dependency was confirmed for all three auxetic structures.https://www.mdpi.com/2075-4701/11/1/52auxetic chiral structuresSplit Hopkinson Pressure Barlow and high strain ratesdigital image correlationmechanical behaviourstrain rate sensitivity |
| spellingShingle | Anja Mauko Tomáš Fíla Jan Falta Petr Koudelka Václav Rada Michaela Neuhäuserová Petr Zlámal Matej Vesenjak Ondřej Jiroušek Zoran Ren Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates Metals auxetic chiral structures Split Hopkinson Pressure Bar low and high strain rates digital image correlation mechanical behaviour strain rate sensitivity |
| title | Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates |
| title_full | Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates |
| title_fullStr | Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates |
| title_full_unstemmed | Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates |
| title_short | Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates |
| title_sort | dynamic deformation behaviour of chiral auxetic lattices at low and high strain rates |
| topic | auxetic chiral structures Split Hopkinson Pressure Bar low and high strain rates digital image correlation mechanical behaviour strain rate sensitivity |
| url | https://www.mdpi.com/2075-4701/11/1/52 |
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