Testing of Auxetic Materials Using Hopkinson Bar and Digital Image Correlation

被引：7

作者：

Fila, Tomas ^{[1
]}

Zlamal, Petr ^{[1
]}

Falta, Jan ^{[1
]}

Doktor, Tomas ^{[1
]}

Koudelka, Petr ^{[1
]}

Kytyr, Daniel ^{[1
]}

Adorna, Marcel ^{[1
]}

Luksch, Jutta ^{[2
]}

Neuhauserova, Michaela ^{[1
]}

Valach, Jaroslav ^{[3
]}

Jirousek, Ondrej ^{[1
]}

机构：

[1] Czech Tech Univ, Fac Transportat Sci, Konviktska 20, Prague 11000, Czech Republic

[2] Univ Saarland, Inst Appl Mech, Campus A4-2, D-66123 Saarbrucken, Germany

[3] Czech Acad Sci, Inst Theoret & Appl Mech, Prosecka 76, Prague 19000, Czech Republic

来源：

12TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING (DYMAT 2018) | 2018年 / 183卷

关键词：

D O I：

10.1051/epjconf/201818302045

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, a split Hopkinson pressure bar (SHPB) was used for impact loading of an auxetic lattice (structure with negative Poissons 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 Poissons ratio of the auxetic structure.

引用

页数：6

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