Hugoniot of water ice
Hugoniot data for water ice are available for pressures ranging from about 150 MPa to about 50 GPa from initial states near 260 K. Limited data on porous ice (snow) at the same initial temperatures are available from 3.5 to 38 GPa and initial densities of 600 and 350 Mg/m/sup 3/. Above about 5 GPa, the data are fairly well-fit by a linear relation between shock and particle velocity: D(km/s) = 1.79 + 1.42u. However, a quadratic form fits the data better: D(km/s) = 1.32 + 1.68u - 0.035u/sup 2/. At lower stresses the velocity is a very complicated function of particle velocity due to elastic propagation, yielding and several possible phase changes. The Hugoniot elastic limit (HEL) of ice at these temperatures is about 180 +- 20 MPa with the elastic waves travelling at about 3900 m/s. The mean stress at the HEL is 115 +- 14 MPa. Comparison with strength measurements at lower strain rate indicates that failure at the HEL probably involves fracture and is almost independent of both temperature and strain rate. Ice V has been reported at about 600 MPa, and ice VI at 1.9 GPa and possibly at 3.7 GPa. Transition to ice III probably commences at the HEL at 200 MPa. Relations between volume, enthalpy and internal energy indicate that states below about 1 GPa maintain their shear strength even after undergoing complete transition to a high pressure phase. Time-resolved stress measurements indicate that equilibrium is achieved in about three microseconds for a 695 MPa shock. Melting is definitely complete below 10 GPa.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6846176
- Report Number(s):
- LA-UR-84-919; CONF-840153-1; ON: DE84010069
- Resource Relation:
- Conference: NATO workshop on ices in the solar system, Nice, France, 16 Jan 1984; Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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