Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F21%3A00534057" target="_blank" >RIV/68378297:_____/21:00534057 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21260/21:00345978

Výsledek na webu

<a href="https://doi.org/10.1016/j.ijimpeng.2020.103767" target="_blank" >https://doi.org/10.1016/j.ijimpeng.2020.103767</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijimpeng.2020.103767" target="_blank" >10.1016/j.ijimpeng.2020.103767</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar

Popis výsledku v původním jazyce

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 straingauges on both bars (a so called Open Hopkinson Pressure Bar - OHPB) was 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 was successfully tested at impact velocities in a range of 5 − 30m · s−1 with both linear elastic and viscoelastic 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 visco-elastic 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.

Název v anglickém jazyce

Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar

Popis výsledku anglicky

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 straingauges on both bars (a so called Open Hopkinson Pressure Bar - OHPB) was 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 was successfully tested at impact velocities in a range of 5 − 30m · s−1 with both linear elastic and viscoelastic 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 visco-elastic 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal of Impact Engineering

ISSN

0734-743X

e-ISSN

1879-3509

Svazek periodika

148

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

SE - Švédské království

Počet stran výsledku

17

Strana od-do

103767

Kód UT WoS článku

000606493200002

EID výsledku v databázi Scopus

2-s2.0-85096665585