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Titel: Dynamic impact testing of cellular solids and lattice structures : Application of two-sided direct impact Hopkinson bar
VerfasserIn: Fíla, Tomáš
Koudelka, Petr
Falta, Jan
Zlámal, Petr
Rada, Václav
Adorna, Marcel
Bronder, Stefan
Jiroušek, Ondřej
Sprache: Englisch
Titel: International Journal of Impact Engineering
Bandnummer: 148 (2021)
Verlag/Plattform: Elsevier
Erscheinungsjahr: 2020
Freie Schlagwörter: Direct impact Hopkinson bar
Cellular solid
Auxetic metamaterials
Digital image correlation
Wave separation
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Direct impact testing with a Hopkinson bar is, nowadays, a very popular experimental technique for investigating the behavior of cellular materials, e.g., lattice metamaterials, at high strain-rates as it overcomes several limitations of the conventional Split Hopkinson Pressure Bar (SHPB). However, standard direct impact Hopkinson bars (DIHB) have only single-sided instrumentation complicating the analysis. In this paper, a DIHB apparatus instrumented with conventional strain-gauges on both bars (a so called Open Hopkinson Pressure Bar - OHPB) is used for dynamic impact experiments of cellular materials. Digital image correlation (DIC) is used as a tool for investigating the displacements and velocities at the faces of the bars. A straight-forward wave separation technique combining the data from the strain-gauges with the DIC is adopted to increase the experiment time window multiple times. The experimental method is successfully tested at impact velocities in a range of 5 − 30 m⋅s− 1 with both linear elastic and visco-elastic bars of a medium diameter. It is shown that, under certain circumstances, a simple linear elastic model is sufficient for the evaluation of the measurements with the viscoelastic bars, while no additional attenuation and phase-shift corrections are necessary. The applicability of the experimental method is demonstrated on various experiments with conventional metal foams, hybrid foams, and additively manufactured auxetic lattices subjected to dynamic compression.
DOI der Erstveröffentlichung: 10.1016/j.ijimpeng.2020.103767
URL der Erstveröffentlichung: http://dx.doi.org/10.1016/j.ijimpeng.2020.103767
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-383555
hdl:20.500.11880/34603
http://dx.doi.org/10.22028/D291-38355
ISSN: 0734-743X
Datum des Eintrags: 2-Dez-2022
Bezeichnung des in Beziehung stehenden Objekts: Supplementary material
In Beziehung stehendes Objekt: https://ars.els-cdn.com/content/image/1-s2.0-S0734743X2030837X-mmc1.zip
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Materialwissenschaft und Werkstofftechnik
Professur: NT - Keiner Professur zugeordnet
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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