Results 171 to 180 of about 4,834 (220)
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
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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. +2 more
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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. +2 more
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Split Hopkinson pressure bar experiments on polymeric foams
International Journal of Vehicle Design, 2005Proper 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.
Baolin Song
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Dispersion Investigation in the Split Hopkinson Pressure Bar
Journal of Engineering Materials and Technology, 1990Dispersion 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
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Dynamic photoelasticity with a split Hopkinson pressure bar
19th Intl Congress on High-Speed Photography and Photonics, 1991To 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
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Wave Propagation in the Split Hopkinson Pressure Bar
Journal of Engineering Materials and Technology, 1983Elastic 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
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A polymeric split Hopkinson pressure bar instrumented with velocity gages
Experimental Mechanics, 2003Polymeric 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
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Split Hopkinson Pressure Bar Graphical Analysis Tool
Experimental Mechanics, 2016An 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 +5 more
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