High-pressure quasi-isentropic impact experiments
A method has been developed for generting quasi-isentropic compression waves in flat-plate impact experiments. Peak stresses can be in the multi-megabar range, thus allowing investigations of material properties in a high-pressure, low-temperature regime which is inaccessible either quasi-statically or by conventional shock wave experiments. The key to the technique is a thin impactor with a smooth but strong gradient in shock impedance. Novel impactor fabrication and testing methods have been developed to attain the excellent uniformity and relatively close control of the shock impedance profile which are needed. In using the method, it is normally desirable to obtain time-resolved measurements of either pressure or particle velocity at two distances from the impact surface. The stress-volume loading path followed by the specimen can then be obtained from a centered-wave analysis, provided certain assumptions are valid. The data and results of several experiments are presented.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5863981
- Report Number(s):
- SAND-83-0850C; CONF-830719-31; ON: DE83016215
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPRESSION
EQUATIONS
EQUATIONS OF STATE
EQUIPMENT
IMPACT SHOCK
IMPACT TESTS
ISENTROPIC PROCESSES
MATERIALS TESTING
MECHANICAL TESTS
SOLIDS
STRAINS
STRESSES
TESTING