DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING - APPLICATIONS FOR SHPB AND ITS MODIFICATION

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F19%3A00335590" target="_blank" >RIV/68407700:21260/19:00335590 - isvavai.cz</a>

Výsledek na webu

<a href="https://ojs.cvut.cz/ojs/index.php/APP/article/view/6019" target="_blank" >https://ojs.cvut.cz/ojs/index.php/APP/article/view/6019</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING - APPLICATIONS FOR SHPB AND ITS MODIFICATION

Popis výsledku v původním jazyce

The presented paper is focused on embedding of the serially manufactured piezo-electric impact load-cell into Split Hopkinson Pressure Bar (SHPB) for a direct force measurement during dynamic loading. Conventionally, during the SHPB test dynamic force equilibrium is investigated by a comparison of the transmitted signal wave and the difference between the incident and reflected signals waves to the incident bar, measured by strain gauges cite{bib1}. However, in the experiments with specimens with low linebreak mechanical impedance, a major portion of the incident wave is reflected back on the boundary between the bar and the specimen. Comparison between two-large amplitude incident and reflected pulse and linebreak a small-amplitude transmitted pulse can be influenced by large error and resulting force equilibrium can be inaccurate. Therefore, a piezo-electric quartz impact force transducer was used to directly measure the axial forces in the vicinity of the specimen end surfaces, allowing to analyze the force equilibrium which is an essential characteristic for reliable measurement. Measured values from strain gauges were compared with values obtained from force transducer, to verify the validity of the acquired signals which will increase the reliability of the measured data. The presented solution will help to determine the mechanical properties of advanced materials which is necessary for investigation of complex modern material structures behaviour.

Název v anglickém jazyce

DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING - APPLICATIONS FOR SHPB AND ITS MODIFICATION

Popis výsledku anglicky

The presented paper is focused on embedding of the serially manufactured piezo-electric impact load-cell into Split Hopkinson Pressure Bar (SHPB) for a direct force measurement during dynamic loading. Conventionally, during the SHPB test dynamic force equilibrium is investigated by a comparison of the transmitted signal wave and the difference between the incident and reflected signals waves to the incident bar, measured by strain gauges cite{bib1}. However, in the experiments with specimens with low linebreak mechanical impedance, a major portion of the incident wave is reflected back on the boundary between the bar and the specimen. Comparison between two-large amplitude incident and reflected pulse and linebreak a small-amplitude transmitted pulse can be influenced by large error and resulting force equilibrium can be inaccurate. Therefore, a piezo-electric quartz impact force transducer was used to directly measure the axial forces in the vicinity of the specimen end surfaces, allowing to analyze the force equilibrium which is an essential characteristic for reliable measurement. Measured values from strain gauges were compared with values obtained from force transducer, to verify the validity of the acquired signals which will increase the reliability of the measured data. The presented solution will help to determine the mechanical properties of advanced materials which is necessary for investigation of complex modern material structures behaviour.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

21100 - Other engineering and technologies

Projekt

<a href="/cs/project/GA19-23675S" target="_blank" >GA19-23675S: Moderní numerické a experimentální modelování inovativních sendvičových panelů s buněčným jádrem</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

17th YOUTH SYMPOSIUM ON EXPERIMENTAL SOLID MECHANICS

ISBN

978-80-01-06670-6

ISSN

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e-ISSN

2336-5382

Počet stran výsledku

4

Strana od-do

32-35

Název nakladatele

Česká technika - nakladatelství ČVUT

Místo vydání

Praha

Místo konání akce

Telč

Datum konání akce

6. 6. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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