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Construction and Building Materials, 2022
Abstract In the comparison of Hopkinson bundle bar (HBB) system and the large diameter split Hopkinson pressure bar (SHPB) system, the influence of bar diameter on the dispersion effect of the one-dimensional longitudinal wave is analyzed theoretically firstly.
Qi Zong
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Abstract In the comparison of Hopkinson bundle bar (HBB) system and the large diameter split Hopkinson pressure bar (SHPB) system, the influence of bar diameter on the dispersion effect of the one-dimensional longitudinal wave is analyzed theoretically firstly.
Qi Zong
exaly +2 more sources
Implementation of viscoelastic Hopkinson bars [PDF]
, 2011 The properties of soft, viscoelastic materials at high strain rates are important in furthering our understanding of their role during blast or impact events. Testing these soft or low impedance materials using metallic bars in a split Hopkinson pressure bar setup, poor signal to noise ratios and impedance mismatching occur.
Curry, Richard
core +3 more sources
Measurement Science and Technology, 1995
The conventional split Hopkinson pressure bar system for materials testing at high strain rates produces loading pulses that have a high level of oscillation superimposed on their approximately trapezoidal shape. These oscillations, which are a consequence of the short risetime of the loading pulse produced by the impact of a projectile, cause ...
D J Parry, A G Walker, P R Dixon
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The conventional split Hopkinson pressure bar system for materials testing at high strain rates produces loading pulses that have a high level of oscillation superimposed on their approximately trapezoidal shape. These oscillations, which are a consequence of the short risetime of the loading pulse produced by the impact of a projectile, cause ...
D J Parry, A G Walker, P R Dixon
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Split Bar Hopkinson with Springs Striker Bar Launcher
Applied Mechanics and Materials, 2014Research on the dynamic strength of various materials such as metallic materials, polymers, concrete has been done by many researchers. The Split Hopkinson Bar method is still used to produce a high strain rate. In this method, a striker bar is usually launched using pressurized gas.
Agus Sigit Pramono +2 more
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Experimental Mechanics, 1980
Experiments in which pressure pulses are propagated in a column of fluid held in a stiff tube are described. A parameter, η, which characterizes the tube stiffness has been defined and a one-dimensional model of the wave propagation which includes dissipation both in the volume of the fluid and at the wall of the containing tube has been developed.
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Experiments in which pressure pulses are propagated in a column of fluid held in a stiff tube are described. A parameter, η, which characterizes the tube stiffness has been defined and a one-dimensional model of the wave propagation which includes dissipation both in the volume of the fluid and at the wall of the containing tube has been developed.
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Experimental techniques for the Hopkinson bar
AIP Conference Proceedings, 2000Several factors influence the accuracy of results when using the Split Hopkinson bar. These include longitudinal wave dispersion, and impedance mismatch of the bars with the specimens. In this paper, we discuss our approach to choosing specimen dimensions based on their impedance, thereby improving the transmitted stress signal-to-noise ratio.
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HOPKINSON BAR STUDIES OF A PBX SIMULANT
AIP Conference Proceedings, 2008Experiments were carried out, at a strain rate of 1600 s−1, to characterise an HTPB/sugar propellant simulant within the temperature range of 50 °C to −100 °C. Optical techniques, namely high‐speed photography with digital speckle analysis for flow visualisation, and line‐laser occlusion to measure diametric expansion, were deployed.
Daniel R. Drodge +8 more
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Generalization of split Hopkinson bar technique to use viscoelastic bars
International Journal of Impact Engineering, 1994Summary To study the high strain-rate mechanical behaviour of materials having lower wave impedance, it is suggested to generalize the split Hopkinson bar technique by using polymeric bars. The key of such a generalization lies in the method for determining the stresses and particle velocities at two interfaces of specimen from the strain pulse ...
Lili Wang +3 more
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1999
Most materials show a significant change in mechanical behaviour as the rate of strain (the deformation rate) is increased1 (see High Strain Rate Effects). This is particularly evident at the high strain rates (>102 s −1) which occur under impact or explosive loading conditions.
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Most materials show a significant change in mechanical behaviour as the rate of strain (the deformation rate) is increased1 (see High Strain Rate Effects). This is particularly evident at the high strain rates (>102 s −1) which occur under impact or explosive loading conditions.
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Discussions on Standardization of Hopkinson Bars Technique
2007It is well known that the constitutive behaviour of most materials exhibits rate sensitivity and that the rate dependent (tensile/compressive) properties of such materials should be experimentally studied. The Split Hopkinson Bar (SHB) technique has been successfully applied to investigate the visco-elastic and visco-plastic behaviour of plastics and ...
L. M. Yang, Li Song, Li-Li Wang
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