Equation of state of ductile granular materials

R.G. Kraus; D.J. Chapman; P.D. Church; P. Gould; I.G. Cullis; R. Cornish; W.G. Proud

doi:doi:10.1051/dymat/2009186

All issues

Volume 2 (2009)

10.1051/dymat/2009186

Abstract

Issue		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
DOI		https://doi.org/10.1051/dymat/2009186
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

Abstract
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.