DYMAT 2009
Volume 2, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 1317 - 1323
Section Constitutive Modeling
Published online 15 September 2009
DYMAT 2009 (2009) 1317-1323
DOI: 10.1051/dymat/2009186

Equation of state of ductile granular materials

R.G. Kraus1, D.J. Chapman1, P.D. Church2, P. Gould2, I.G. Cullis2, R. Cornish2 and W.G. Proud1

1  SMF, Cavendish Laboratory, JJ Thomson Avenue, University of Cambridge, CB3 0HE, UK
2  QinetiQ, Fort Halstead, Sevenoaks, Kent TN 14 7BP, UK

Published online: 15 September 2009

As part of an effort to improve the general understanding of ductile granular materials under shock wave loading we have performed a number of experiments to test their behaviour during an impact experiment. In particular, we have obtained wave profiles and determined the principle Hugoniot for 14% porous Aluminum in the stress range of 0.6–4.6 GPa. The Hugoniot data compare reasonably well with a Mie-Grüneisen equation of state. However, the wave profiles exhibit structure that suggests a relatively high yield strength and large dispersive properties, structure that a purely thermodynamic EOS cannot explain. The wave profiles themselves have been compared with numerical simulations using GRIM, the two-dimensional Eulerian hydrocode, and show relatively good agreement.

© EDP Sciences 2009