Original title: A Split Hopkinson Bar Method for Testing Materials with Low Characteristic Impedance
Authors: Buchar, J. ; Řídký, R. ; Drdlová, M. ; Trnka, Jan
Document type: Papers
Conference/Event: EAN 2015 /53./, Český Krumlov (CZ), 2015-06-01 / 2015-06-04
Year: 2015
Language: eng
Abstract: A split Hopkinson pressure bar (SHPB) technique has been developed to study dynamic behaviour of materials having low characteristic impedance. To enable better matching of characteristic impedance with a specimen, polymethyl methacrylate (PMMA) bar is used as the output bar. The viscoelastic properties of PMMA are determined in advance through preliminary experiments. In the present SHPB method, the wave analysis of the stress pulses is executed in the frequency domain. Transmitted pulses on the PMMA output bar resulting from a SHPB test are resolved into frequency components by the Fourier transform, and are corrected to be the waveforms at the specimen-bar interfaces. The corrected waveforms have been used for the evaluation of experimental results on the stress pulse transmission and reflection at the interface between elastic (Aluminium) and viscoelastic bars.
Keywords: reflection; stress wave propagation; transmission; viscoelasticity
Host item entry: 53rd Conference on Eperimental Stress Analysis 2015, ISBN 978-80-01-05734-6

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0247814

Permalink: http://www.nusl.cz/ntk/nusl-188966


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Research > Institutes ASCR > Institute of Thermomechanics
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