Results 201 to 210 of about 12,040 (234)
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Development of the polymeric split hopkinson bar technique
Journal of Applied Mechanics and Technical Physics, 2001A compression version of the split Hopkinson bar with pressure bars and a striker, which are made of Plexiglas (a material with low density and velocity of sound) is developed. The technique is designed to determine stress—strain diagrams under high strain rates of highly deformable materials with low density and strength, such as plastics, foams, and ...
A. S. Yunoshev, V. V. Sil'vestrov
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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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An innovative electromagnetic compressive split Hopkinson bar
International Journal of Mechanics and Materials in Design, 2009This paper proposes a new design for the compressive split Hopkinson bar that makes use of the intense pressure created in a transient magnetic field formed by the passage of a pulse of electric current through a series of coils. The proposed technology enables to characterize the behaviour of materials under high strain-rates with a small acceleration
C. M. A. Silva +2 more
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Implementation of viscoelastic Hopkinson bars
2014The 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.
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Identification of Constitutive Model Parameters in Hopkinson Bar Tests
In this work, tension and compression tests have been carried out on aluminium samples at low and high strain rate, the latter performed by means of a direct tension Hopkinson bar equipment. The parameters of the Johnson-Cook constitutive model have been identified using different approaches; the first method consists in the classical Finite Element ...Fardmoshiri M. +4 more
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Wave Dispersion in Kolsky-Hopkinson Bar Machine
2018This chapter is interested in the wave dispersion effects in Kolsky-Hopkinson bar machine. First, Section 6.2 introduces how to assess wave dispersion parameters in three-dimensional elastic and viscoelastic bars using analytical analysis. Subsequently, Sect. 6.3 introduces experimental techniques used to measure the wave dispersion.
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Split Hopkinson bar testing apparatus
1998FIGURE 2 shows compression wave generation apparatus 101 to the left of split Hopkinson pressure bar 102 including input bar 103 connected via test specimen 104 to output bar 105. Compression wave 106,107 is generated by initially placing impactor bar 109 under a pre-load force by hydraulic actuator 108 (in the direction of arrow A) until fragile ...
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Advancements in the Split Hopkinson Bar Test
2014The split Hopkinson bar test is the most commonly used method for determining material properties at high rates of strain. The theory governing the specifics of Hopkinson bar testing has been around for decades. It has only been the last decade or so, however, that significant data processing advancements have been made. It is the intent of this thesis
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