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The Origins of the Hopkinson Bar Technique
2018Although Bertram Hopkinson had a research interest in the dynamic strengths of materials, the bar technique he published in 1914 was developed to roughly determine the shapes of stress pulses produced by bullet impact and explosions. His pressure bar proved useful to the British explosives and armour industry during the Great War allowing them to ...
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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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Experimental investigation of the deformation of Hopkinson bar specimens
International Journal of Impact Engineering, 2004Split Hopkinson bar (SHB) experiments are often used to study the strain rate dependent mechanical properties of materials. During a SHB experiment a small sample of the material under study is subjected to a high strain rate, uni-axial, tensile, compressive or torsion load.
Patricia Verleysen, Joris Degrieck
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Hopkinson bar experimental technique: A critical review
Applied Mechanics Reviews, 2004A critical review of three classic papers by B Hopkinson, RM Davies, and H Kolsky, and the state-of-the-art in Hopkinson bar experimental techniques is presented. The validity and applicability of the assumption made in the 1D Hopkinson bar theory are discussed.
Bazle A Gama +2 more
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Identification of Constitutive Model Parameters in Hopkinson Bar Tests
2016In 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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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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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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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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