Results 221 to 230 of about 12,650 (263)

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

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   +2 more sources

Split Hopkinson pressure bar experiments on polymeric foams

International Journal of Vehicle Design, 2005
Proper modifications are required when a split Hopkinson pressure bar (SHPB) is used to determine the dynamic compressive properties of polymeric foams. Pulse shaping is necessary to ensure valid testing conditions: constant strain-rate deformation under dynamically equilibrated stresses, which need to be experimentally verified.
B. Song, W. Chen, X. Jiang
openaire   +1 more source

Round-Robin test of split Hopkinson pressure bar

International Journal of Impact Engineering, 2019
Abstract A Round-Robin test using split Hopkinson pressure bars (SHPBs) has been conducted by four universities: Swinburne University of Technology (SUT), Australia; University of Sao Paulo (USP), Brazil; University of Cape Town (UCT), South Africa; and Nanyang Technological University (NTU), Singapore. Each university had different sets of SHPBs and
Muhammad A. Kariem, Rafael C. Santiago, Reuben Govender, Dong Wei Shu, Dong Ruan, Gerald Nurick, Marcilio Alves, Guoxing Lu, Genevieve S. Langdon   +8 more
openaire   +2 more sources

Thickness effects in split Hopkinson pressure bar tests

Polymer, 1993
Abstract Results are presented for the high strain rate behaviour of a medium and high density polyethylene, polycarbonate and poly(ether ether ketone) in compression for strain rates up to 104s−1 obtained using a split Hopkinson pressure bar apparatus.
N.N Dioh, P.S Leevers, J.G Williams
openaire   +1 more source

Dispersion Correction for Split-Hopkinson Pressure Bar Data

1988
Abstract : Large diameter Split-Hopkinson Pressure Bar (SHPB) systems required a correction of the strain signals to account for wave dispersion. Using a Fast Fourier transform (FFT) algorithm a wave dispersion correction program was developed for the 3.0 inch diameter SHPB at the University of Florida and the 2. 0 inch diameter SHPB at Tyndall AFB FL.
J. C. Gong, E. Jerome, D. A. Jenkins, L. E. Malvern   +3 more
openaire   +1 more source