A Split Hopkinson Bar Method for Testing Materials with Low Characteristic Impedance

0445160 - ÚT 2016 RIV CZ eng C - Conference Paper (international conference)
Buchar, J. - Řídký, R. - Drdlová, M. - Trnka, Jan
A Split Hopkinson Bar Method for Testing Materials with Low Characteristic Impedance.
53rd Conference on Eperimental Stress Analysis 2015. Prague: CTU Faculta of Civil Engineering, 2015, s. 27-33. ISBN 978-80-01-05734-6.
[EAN 2015 /53./. Český Krumlov (CZ), 01.06.2015-04.06.2015]
Institutional support: RVO:61388998
Keywords : stress wave propagation * viscoelasticity * reflection * transmission
Subject RIV: BI - Acoustics

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.
Permanent Link: http://hdl.handle.net/11104/0247814