| Autor: |
Fíla, Tomáš, Zlámal, Petr, Falta, Jan, Doktor, Tomáš, Koudelka, Petr, Kytýř, Daniel, Adorna, Marcel, Luksch, Jutta, Neuhäuserová, Michaela, Valach, Jaroslav, Jiroušek, Ondřej |
| Předmět: |
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| Zdroj: |
EPJ Web of Conferences; 2018, Vol. 183, p1-6, 6p |
| Abstrakt: |
In this paper, a split Hopkinson pressure bar (SHPB) was used for impact loading of an auxetic lattice (structure with negative Poisson's ratio) at a given strain-rate. High strength aluminum and polymethyl methacrylate bars instrumented with foil strain-gauges were used for compression of an additively manufactured missing-rib auxetic lattice. All experiments were observed using a high-speed camera with frame-rate set to approx. 135.000 fps. High-speed images were synchronized with the strain-gauge records. Dynamic equilibrium in the specimen was analyzed and optimized pulse-shaping was introduced in the selected experiments. Longitudinal and lateral in-plane displacements and strains were evaluated using digital image correlation (DIC) technique. DIC results were compared with results obtained from strain-gauges and were found to be in good agreement. Using DIC, it was possible to analyze in-plane strain distribution in the specimens and to evaluate strain dependent Poisson's ratio of the auxetic structure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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