Results 171 to 180 of about 4,813 (219)

On the use of a viscoelastic split hopkinson pressure bar

International Journal of Impact Engineering, 1997
To test weak materials such as foams at high strain rates, the use of a Split Hopkinson Pressure Bar (SHPB) setup made of low impedance bars, which are mostly viscoelastic, is indispensable. In this paper a detailed study of the technical problems of such a viscoelastic setup related to the measurement and to the loading conditions is offered.
Zhao, H., Gary, Gérard, Klepaczko, Janusz, R   +2 more
openaire   +3 more sources

Misalignment effect in the split Hopkinson pressure bar technique

International Journal of Impact Engineering, 2012
Abstract It is well known that alignment of the bar in a split Hopkinson pressure bar (SHPB) experiment plays a significant role in producing a good clean signal. In this paper, numerical simulations using ANSYS-LSDYNA are employed to comprehensively study the effects of bar misalignment in producing a distorted signal.
Kariem, Muhammad A., Beynon, John H., Ruan, Dong   +2 more
openaire   +3 more sources

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Dispersion Investigation in the Split Hopkinson Pressure Bar

Journal of Engineering Materials and Technology, 1990
Dispersion of an elastic wave propagating in a 76.2-mm-diameter (3 in.) Split Hopkinson Pressure Bar system was investigated with two consecutive pulses recorded in the transmitter bar. Assuming that the dispersive high frequency oscillatory components riding on the top of the main pulse originate from the first mode vibration, the dispersion was ...
J. C. Gong, L. E. Malvern, D. A. Jenkins
openaire   +1 more source

Wave Propagation in the Split Hopkinson Pressure Bar

Journal of Engineering Materials and Technology, 1983
Elastic wave propagation in the split Hopkinson pressure bar (SHPB) is discussed with an emphasis on the origin and nature of the oscillations that often trail the leading edge of the pressure wave. We show that in the conditions of the SHPB test the pressure bars vibrate in the fundamental mode and that elastic wave propagation can be fully described ...
P. S. Follansbee, C. Frantz
openaire   +1 more source

A polymeric split Hopkinson pressure bar instrumented with velocity gages

Experimental Mechanics, 2003
Polymeric split Hopkinson pressure bars are often used to test low-impedance materials at elevated strain rates. However, they tend to be viscoelastic, and a viscoelastic wave propagation model is required to analyze the data. This considerably complicates the analysis over the more common linear elastic split Hopkinson bar.
D.T. Casem, W.L. Fourney, P. Chang
openaire   +1 more source

Dynamic photoelasticity with a split Hopkinson pressure bar

19th Intl Congress on High-Speed Photography and Photonics, 1991
To observe the behaviour of materials subject to impact shock loads, accurate high frequency measurements are vital. The measurement of ultra short pulses (less than 50 microseconds) can be carried out by means of electrical resistance strain guages (ERSGs) . The ERSG's also pick up electromagnetic interference signals. Dynamic photoelasticity was
David R. Morris, A. J. Watson
openaire   +1 more source

Split Hopkinson Pressure Bar Graphical Analysis Tool

Experimental Mechanics, 2016
An open-source Split Hopkinson Pressure Bar graphical data analysis tool has been developed. Written in Matlab®, the code can be freely distributed either as an executable binary or editable Matlab files. Beginning with raw voltages from two strain gages along with the incident/transmitted bars’ mechanical and geometrical properties, the user can ...
D.K. Francis, W.R. Whittington, W.B. Lawrimore, P.G. Allison, S.A. Turnage, J.J. Bhattacharyya   +5 more
openaire   +1 more source

TWO-STEP LOADING IN A SPLIT HOPKINSON PRESSURE BAR

AIP Conference Proceedings, 2008
In conventional Split Hopkinson Pressure Bar (SHPB) experiments the striker bar is a single rod and the sample is loaded at one strain rate. In this study, we present results from a system that uses a striker bar formed from two rods of different materials.
Rachel E. Briggs, Daniel R. Drodge, David M. Williamson, William G. Proud, Mark Elert, Michael D. Furnish, Ricky Chau, Neil Holmes, Jeffrey Nguyen   +8 more
openaire   +1 more source

Split-Hopkinson Pressure Bar Testing of Unsaturated Sand

Geotechnical Testing Journal, 1990
Abstract High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the saturation increases from
WA Charlie, CA Ross, SJ Pierce
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Some experiments with the split hopkinson pressure bar∗

Journal of the Mechanics and Physics of Solids, 1964
Abstract A n application of the split Hopkinson pressure bar to the dynamic testing of materials is given whereby continuous records of the strain vs. time, strain rate vs. time, stress vs. time, and stress vs. strain may be simultaneously recorded. For many materials a nearly constant true plastic strain rate can be maintained for loading durations
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