Shock compression of aluminum, copper, and tantalum
Hugoniot curves for Al (alloy 1100), Cu (type oxygen-free high-conductivity), and Ta have been measured in the shock pressure range 30--430 GPa (0.3--4.3 Mbar) with a two-stage light-gas gun. Impactor velocities were measured to 0.1% by flash radiography. Shock velocities were measured to 0.5--1.2% with an electronic detection system with subnanosecond time resolution. Our data and those of other workers were fitted to a linear relation between shock and mass velocities. The fractional standard deviations of the data from the fits range from 0.6 to 0.9% for the three metals. Methods of data analysis and error analysis for individual data points and for the least-squares fitting to the data sets are presented. Bands of uncertainty about the fits, arising from experimental uncertainties in the data, are presented and are used to calculate the systematic error introduced by the method of shock-impedance matching. The accuracy of the data and of the fits qualifies these metals as equation-of-state standards for shock-wave experiments.
- Research Organization:
- Lawrence Livermore National Laboratory, Livermore, California 94550
- OSTI ID:
- 6398513
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 52:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM
COMPRESSION
COPPER
TANTALUM
ACCURACY
EQUATIONS
EQUATIONS OF STATE
ERRORS
EXPERIMENTAL DATA
GUNS
IMAGES
LEAST SQUARE FIT
MATHEMATICAL MODELS
SHOCK WAVES
TIME RESOLUTION
VELOCITY
VERY HIGH PRESSURE
DATA
ELEMENTS
INFORMATION
MAXIMUM-LIKELIHOOD FIT
METALS
NUMERICAL DATA
NUMERICAL SOLUTION
REFRACTORY METALS
RESOLUTION
TIMING PROPERTIES
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties