Multi-component stress history measurements and analysis

Conference · Sat Aug 01 04:00:00 EDT 1987

OSTI ID:5633248

Stout, R B; Larson, D B

Piezoresistance foil gages were tested dynamically in multi-component stress-strain experiments in order that the actual shock wave conditions of underground nuclear testing could be more closely simulated. The multi-component stress-strain histories were created in polymethylmethacrylate (PMMA) by using chemical explosions to generate spherical shock waves. In addition to the resistivity measurements from the foil gages, particle velocity was also measured at several radial positions from the explosion to provide a complete set of data for analysis. The gage interpretation (inverse) problem for multi-component stress-strain fields requires obtaining a sufficient number of independent measurements so that the different stress-strain components influencing the gage response can be uniquely inferred. The piezoresistance measurements provided data from a triple material foil gage and from ytterbium foil gages (bare gages). An analysis shows that the triple material gage containing foils of ytterbium, manganin, and constantan provided three independent resistivity measurements for the gage oriented in a perpendicular direction relative to the radial propagating shock front. An analysis of the ytterbium foil gages, which were tested in both perpendicular (normal) and parallel (tangential) directions relative to the radial shock front, show the resistivity responses from these two orientations are independent measurements. The results from the analyses of the gages compared well with experimental data. This analysis shows clearly that the material properties of the foil, the dimensions of the foil, and the material surrounding the foil greatly influence the total resistivity response of foil gages in a multi-component stress-strain field. 25 refs., 16 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5633248
• Report Number(s): UCRL-96319; CONF-870961-4; ON: DE88000977
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100 -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
47 OTHER INSTRUMENTATION
ALLOYS
CONSTANTAN
COPPER ALLOYS
COPPER BASE ALLOYS
DATA
DESIGN
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRICITY
ELEMENTS
ESTERS
EXPERIMENTAL DATA
EXPLOSIONS
FOILS
INFORMATION
MANGANESE ALLOYS
MANGANIN
MATERIALS TESTING
MEASURING INSTRUMENTS
METALS
NICKEL ALLOYS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
PIEZOELECTRICITY
PIEZOMETRY
PMMA
POLYACRYLATES
POLYMERS
POLYVINYLS
PRESSURE MEASUREMENT
RARE EARTHS
SHOCK WAVES
STRAIN GAGES
TESTING
UNDERGROUND EXPLOSIONS
YTTERBIUM