Results 181 to 190 of about 24,236 (228)
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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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Stored Torque Torsional Split Hopkinson Bar Apparatus
Journal of Aerospace Sciences and Technologies, 2023Torsional Split Hopkinson Bar (TSHB) apparatus is extensively used for obtaining shear response of the materials in the strain rate range of 102 s-1 to 104 s-1. Even though the stored torque TSHB is widely used, its design and development technique is not readily available.
Bhaskar Ramagiri +2 more
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Spallationsversuche von Faserbetonprobekörpern im Split‐Hopkinson‐Bar
Beton- und Stahlbetonbau, 2021AbstractAuf Basis von Spallationsversuchen an faserbewehrten Betonproben im Split‐Hopkinson‐Bar wurden die dynamischen Kennwerte Elastizitätsmodul, Zugfestigkeit und Bruchenergie ermittelt. Untersucht wurden Betonproben der Festigkeitsklassen C20/25, C40/50 und C80/95 mit Stahlfasergehalten von 0 bis 2,0 Vol.‐ % sowie mit Carbon‐ und PP‐Fasern im ...
Oliver Mosig +5 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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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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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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Split Hopkinson Bar Measurements of PBXS
AIP Conference Proceedings, 2004Room temperature stress‐strain curves were measured for the polymer bonded explosive (PBX) EDC 37 at strain rates between 400 s−1 and 4000 s−1. The material was found to exhibit strong strain rate dependence in this region, the strength increasing linearly with increasing rate.
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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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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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