A simple wave separation method for Split Hopkinson Bar experiments using linear encoders
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F25%3A00387522" target="_blank" >RIV/68407700:21260/25:00387522 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.rineng.2025.106980" target="_blank" >https://doi.org/10.1016/j.rineng.2025.106980</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.rineng.2025.106980" target="_blank" >10.1016/j.rineng.2025.106980</a>
Alternative languages
Result language
angličtina
Original language name
A simple wave separation method for Split Hopkinson Bar experiments using linear encoders
Original language description
The Split Hopkinson bar is a well-established instrument for testing material properties at high strain rates. Despite its popularity, the method has limitations due to its measurement principle, which involves the propagation of the strain wave in elastic slender bars. A key limitation is the superposition of strain waves, which primarily limits the maximum duration of experiments. To address this, wave separation (or wave deconvolution) techniques have been developed to separate overlapping strain waves. However, existing methods often involve complex algorithms, wave dispersion issues requiring an analytical model of the bar's material, or expensive experimental equipment. This paper introduces a simple wave separation technique using linear magnetic encoders as velocity sensors in a Split Hopkinson bar. The approach relies on solving wave propagation equations at a single point, using velocity signals from the linear encoder and strain data from a conventional strain-gauge. The method offers several advantages, including simplicity in instrumentation and calculation, suppression of wave dispersion effects, easy implementation, and cost-effective sensors. We validate the method through numerical simulations with a custom finite element code, analyzing error sources and their impact. Experimentally, we demonstrate the principle using void tests (experiments without a specimen) and compare the results with the conventional strain-gauge method. The technique is further applied to various Split Hopkinson bar systems and materials, including compression, tension, and cellular materials. The results are promising, with good performance within the application range of the method. The paper concludes with a discussion of its advantages and limitations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
<a href="/en/project/GM22-18033M" target="_blank" >GM22-18033M: High velocity impact dynamics with fast and flash X-ray radiography</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Results in Engineering
ISSN
2590-1230
e-ISSN
2590-1230
Volume of the periodical
28
Issue of the periodical within the volume
12
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
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UT code for WoS article
001570648800001
EID of the result in the Scopus database
2-s2.0-105015367093