On the use of a viscoelastic split hopkinson pressure bar

✍ Scribed by H. Zhao; G. Gary; J.R. Klepaczko

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 728 KB
• Volume: 19
• Category: Article
• ISSN: 0734-743X
• DOI: 10.1016/s0734-743x(96)00038-3

✦ Synopsis

To test weak materials such as foams at high strain rates, the use of a Split Hopkinson Pressure Bar (SH PB) 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.