Shock compression and isentropic release of granite
Abstract
New equation of state data for a weathered granite shocked to about 125 GPa are reported and combined with the Westerly granite data of McQueen, Marsh & Fritz (1967). The shock velocity (U_s)-particle velocity (U_p) relations can be fitted with two linear regressions: U_s= 4.40 + 0.6U_p for a range of U_p up to about 2 km s^(-1) and U_s= 2.66 + 1.49U_p for a range of about 2 to 5 km s^(-1). The third-order Birch-Murnaghan equation of state parameters are K_(os) = 51-57 GPa and K'_(os) = 1.4-1.8 for the low-pressure regime and K_(os) = 251 ± 30 GPa and an assumed K'_(os) = 4 for the high-pressure regime. Compressive waveforms in dry and water-saturated granite were measured at 10-15 GPa using the VISAR technique. The measured wave profiles were successfully modelled using a Maxwellian stress-relaxation material model. Water-saturated granite is characterized by a ~25 per cent lower yield strength and a ~75 per cent longer material relaxation time than dry granite.
Additional Information
© 1995 Oxford University Press. Accepted 1994 June 7; Received 1993 March 15. We are grateful to Michael Long and Epaprodito Gelle for their assistance in maintaining the guns and preparing samples. The helpful comments proffered by S. Peyton are appreciated. John Beckett helped us to make granite glass for probe analysis. The research was supported under AFGL and Mission Research Corporation Contracts GL F19627-88-K-0034 and SC-0064-90-0002, respectively. Contribution number 5004. Division of Geological and Planetary Sciences.Attached Files
Published - Geophys._J._Int.-1995-Sekine-247-61.pdf
Files
Name | Size | Download all |
---|---|---|
md5:ce173eaba0272c9539587723af910de3
|
1.3 MB | Preview Download |
Additional details
- Eprint ID
- 50913
- Resolver ID
- CaltechAUTHORS:20141028-091644578
- F19627-88-K-0034
- Air Force Geophysics Laboratory
- SC-0064-90-0002
- Mission Research Corporation
- Created
-
2014-10-28Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological and Planetary Sciences
- Other Numbering System Identifier
- 5004