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Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates
| Content Provider | MDPI |
|---|---|
| Author | Tom, áš Fíla Michaela, Neuhäuserová Petr, Zlámal Ond, řej Jiroušek Mauko, Anja Falta, Jan Koudelka, Petr Rada, Václav Vesenjak, Matej Ren, Zoran |
| Copyright Year | 2020 |
| 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. |
| Starting Page | 52 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met11010052 |
| Journal | Metals |
| Issue Number | 1 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-12-29 |
| Access Restriction | Open |
| Subject Keyword | Metals Characterization and Testing of Materials Auxetic Chiral Structures Split Hopkinson Pressure Bar Low and High Strain Rates Digital Image Correlation Mechanical Behaviour Strain Rate Sensitivity |
| Content Type | Text |
| Resource Type | Article |
