• Doktor, Tomáš
• Kytýř, Daniel
• Jiroušek, Ondřej
• Neuhäuserovtomá, Michaela
• Valach, Jaroslav
• Koudelka, Petr
• Adorna, Marcel
• Fíla, Tomáš
• Luksch, Jutta
• Falta, Jan
• Zlámal, Petr

Abstract

<jats:p>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.</jats:p>

Topics

• experiment
• aluminium
• strength