Performance characteristics of Hopkinson’s set-up pneumatic launcher

Kamil Sobczyk; Leopold Kruszka; Ryszard Chmielewski; Ryszard Rekucki

doi:10.14311/AP.2021.61.0552

Authors

Kamil Sobczyk Military University of Technology, Faculty of Civil Engineering and Geodesy, Department of Military Engineering and Military Infrastructure, 2 Gen. Sylwester Kaliski Str., 00-908 Warsaw, Poland https://orcid.org/0000-0002-5929-757X
Leopold Kruszka Military University of Technology, Faculty of Civil Engineering and Geodesy, Department of Military Engineering and Military Infrastructure, 2 Gen. Sylwester Kaliski Str., 00-908 Warsaw, Poland
Ryszard Chmielewski Military University of Technology, Faculty of Civil Engineering and Geodesy, Department of Military Engineering and Military Infrastructure, 2 Gen. Sylwester Kaliski Str., 00-908 Warsaw, Poland https://orcid.org/0000-0001-5662-9180
Ryszard Rekucki Military University of Technology, Faculty of Civil Engineering and Geodesy, Department of Military Engineering and Military Infrastructure, 2 Gen. Sylwester Kaliski Str., 00-908 Warsaw, Poland https://orcid.org/0000-0002-2040-7073

DOI:

https://doi.org/10.14311/AP.2021.61.0552

Keywords:

pneumatic launcher, Hopkinson measuring bar, direct impact tests

Abstract

The paper presents a performance characteristics of a pneumatic launcher, which is an important element of the split Hopkinson bar set-up (SHPB) at the Department of Military Engineering and Infrastructure (the Military University of Technology in Warsaw) for the purpose of dynamic strength tests of construction materials. The process of experimental calibration of the launcher for selected loading bar-projectiles is shown. Two types of compression during direct impact tests were also used simultaneously to investigate the behaviour of metallic samples with the use of this launcher as well as the Hopkinson measuring bar: the first — a short cylindrical sample, including a miniature (small diameter) sample, and the second — a long cylindrical sample (Taylor test). The relationships describing the stress and strain state as a function of strain rate for the first type of the experiment and engineering empirical formulas for the second type of the research were given.

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