title: Hugoniot equation of state of rock materials under shock compression.
abstract: Two sets of shock compression tests (i.e. conventional and reverse impact) were conducted to determine the shock response of two rock materials using a plate impact facility. Embedded manganin stress gauges were used for the measurements of longitudinal stress and shock velocity. Photon Doppler velocimetry was used to capture the free surface velocity of the target. Experimental data were obtained on a fine-grained marble and a coarse-grained gabbro over a shock pressure range of approximately 1.5-12 GPa. Gabbro exhibited a linear Hugoniot equation of state (EOS) in the pressure-particle velocity (P-up) plane, while for marble a nonlinear response was observed. The EOS relations between shock velocity (US) and particle velocity (up) are linearly fitted as US= 2.62 + 3.319upand US= 5.4 85 + 1.038upfor marble and gabbro, respectively.This article is part of the themed issue 'Experimental testing and modelling of brittle materials at high strain rates'.
authors.affiliation: Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia qianbing.zhang@monash.edu.
authors.forename: Q B
authors.identifier: http://orcid.org/0000-0002-1162-6557
authors.initials: QB
authors.lastname: Zhang
authors.affiliation: Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK.
authors.forename: C H
authors.initials: CH
authors.lastname: Braithwaite
authors.affiliation: Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: J
authors.initials: J
authors.lastname: Zhao
keywords: dynamic loading; equation of state; plate impact; rock materials; shock compression; strain rate