Analytical and Experimental Analysis of Stress Uniformity in Specimen During Direct Impact Hopkinson Bar Test

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21260%2F22%3A00364083" target="_blank" >RIV/68407700:21260/22:00364083 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.21495/512109" target="_blank" >https://doi.org/10.21495/512109</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.21495/512109" target="_blank" >10.21495/512109</a>

Result language
angličtina
Original language name
Analytical and Experimental Analysis of Stress Uniformity in Specimen During Direct Impact Hopkinson Bar Test
Original language description
Stress uniformity in a specimen represents a crucial parameter for validity of impact experiment conducted in a split Hopkinson bar. Principle of the experimental method is to measure elastic stress waves that propagate in the bars of an experimental setup and to calculate stress to strain relations at the interfaces with the specimen. However, standard procedure to evaluate the experiment can only be valid when stress is distributed approximately uniformly along the specimen. As the stress wave has to propagate through the specimen during the experiment, a time period of significantly non-uniform stress distribution is present and a certain number of wave transits is required to achieve approximately uniform stress distribution. In this paper, a simple analytical model assuming one-dimensional wave propagation theory, non-equal mechanical impedance of the bars and linear elastic material model of the specimen is introduced to determine a number of transits required to achieve uniform stress distribution in the specimen. Potential of the calculated results is discussed in an experiment using a direct impact Hopkinson bar and a material with significant plateau in its stress-strain response.
Czech name
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Czech description
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Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

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)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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