Precision stress measurements in severe shock-wave environments with low-impedance manganin gauges
We describe new techniques that permit the use of low-impedance manganin stress gauges in chemically reacting shock waves in the 1.0--40.0 GPa range. The rugged, small, and fast response gauge has reproducibility better than 2% when used in conjunction with a pulsed bridge circuit and adjustable, current-regulated power supplies. Techniques are presented for fabricating the transducer package, calibrating the bridge circuit and oscilloscopes, designing the drive system, and reducing the data. Data are presented for planar impact experiments performed with a 102-mm gas gun on high-explosive samples. In particular, we directly measured the Chapman-Jouquet pressure in the explosive RX03-BB (92.5% triaminotrinitrobenzene (TATB)/7.5% polychlorotrifluoroethylene (Kel-F binder)) as 28.2 +- 0.6 GPa. These new developments open the possibility of applying low-impedance manganin gauges in chemically reactive hydrodynamic flows such as the evolution of a shock wave into a detonation wave.
- Research Organization:
- Lawrence Livermore Laboratory, University of California, Livermore, California 94550
- OSTI ID:
- 5770235
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 51:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
SHOCK WAVES
STRAIN GAGES
ACCURACY
TRANSDUCERS
TATB
DETONATION WAVES
FABRICATION
CHEMICAL REACTIONS
DATA PROCESSING
ELECTRIC BRIDGES
IMPEDANCE
POWER SUPPLIES
STRESSES
VERY HIGH PRESSURE
CHEMICAL EXPLOSIVES
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPLOSIVES
MEASURING INSTRUMENTS
PROCESSING
440300* - Miscellaneous Instruments- (-1989)
450100 - Military Technology
Weaponry
& National Defense- Chemical Explosions & Explosives