Results 161 to 170 of about 11,857 (209)

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

A modified split Hopkinson pressure bar for toughness tests

Journal de Physique IV (Proceedings), 2006
In order to characterize material toughness or to study crack arrest under dynamic loading conditions, a new testing device has been developed at CEA/Valduc. A new Split Hopkinson Pressure Bar (SHPB) has been modified: it is now composed of a single incident bar and a double transmitter bar.
N. Granier, T. Grunenwald
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

Data processing in the split Hopkinson pressure bar tests

International Journal of Impact Engineering, 1994
Summary The effect on dynamic stress—strain curves of dispersion and shifting of elastic strain pulses travelling in a split Hopkinson pressure bar is reported. The dispersion correction is done in the frequency domain after employing FFT algorithm by adjusting the phase of each Fourier component. The three pulses (incident, reflected and transmitted)
J.M. Lifshitz, H. Leber
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
openaire   +1 more source

Split-Hopkinson pressure bar tests on pure tantalum

AIP Conference Proceedings, 1998
Pure tantalum (Ta) was loaded in compression by a split-Hopkinson pressure bar (SHPB) to strain rates from 450 to 6350 s−1. The results are compared with SHPB data for commercial Ta and with predictions from the constitutive model for Ta developed by Zerilli and Armstrong (Z-A). The main conclusions are: (1) the flow stress versus log strain rate agree
Richard D. Dick, Ronald W. Armstrong, John D. Williams   +2 more
openaire   +1 more source

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
openaire   +1 more source