On the use of a viscoelastic split Hopkinson pressure bar

Abstract : 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. On the basis of the three-dimensional (3D) Fourier stationary harmonic wave analysis, the wave shifting technique is developed. It is shown that the effect of geometrical dispersion in a viscoelastic setup is generally non-negligible. The case of loading with a viscoelastic projectile is also analysed, showing that the impact of a viscoelastic projectile creates an incident wave with a significant time extension.
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Submitted on : Sunday, November 5, 2006 - 6:53:20 PM
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H. Zhao, G. Gary, J. R. Klepaczko. On the use of a viscoelastic split Hopkinson pressure bar. International Journal of Impact Engineering, Elsevier, 1997, 19, pp.319-330. ⟨10.1016/S0734-743X(96)00038-3⟩. ⟨hal-00111585⟩



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