Stress-strain gage measurements on a Nevada Test Site (NTS) event using pairs of triple foil gages

Conference · Fri Nov 30 00:00:00 EST 1990

OSTI ID:5991919

Kansa, E J; Stout, R B

A triple-material stress-strain gage containing foils of ytterbium, manganin, and constantan was tested at LLNL. This gage yields three independent piezoresistance measurements from which an independent set of principal strains and principal stresses can be inferred. We have analyzed the signals from a gage at a specific location buried at a distance from the center of energy of an event at NTS. We inverted the resistivity signals to calculate the stress and strain histories as sensed by the foils. Using the elastic material properties and the traction and displacement conditions at the various material interfaces from the foils to the host geological medium, we calculated the stress and strain histories in the host geological medium. However, because of uncertainties in the elastic properties of the layers of surrounding materials, we calculated significant variations in both the peaks and signatures of the stress and strain histories that could produce the foil stress and strain histories. We conclude that, because of the inclusion problem, accurate measurements of the stress-strain histories in the host geological medium can be adequately addressed only by minimizing, as much as possible, such uncertainties.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5991919
• Report Number(s): UCRL-JC-105356; CONF-910598-1; ON: DE91005061
• Resource Relation: Conference: 37. Instrument Society of America international instrumentation symposium, San Diego, CA (USA), 5-9 May 1991
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
STRAIN GAGES
DESIGN
STRESSES
MEASURING METHODS
TUFF
UNDERGROUND EXPLOSIONS
CONSTANTAN
ELASTICITY
EPOXIDES
FOILS
INTERFACES
MANGANIN
NEVADA TEST SITE
NUCLEAR EXPLOSIONS
YTTRIUM
ALLOY-CU52NI47
ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
ELEMENTS
EXPLOSIONS
MANGANESE ALLOYS
MEASURING INSTRUMENTS
MECHANICAL PROPERTIES
METALS
NATIONAL ORGANIZATIONS
NICKEL ALLOYS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
TENSILE PROPERTIES
TRANSITION ELEMENTS
US DOE
US ORGANIZATIONS
440800* - Miscellaneous Instrumentation- (1990-)
450200 - Military Technology
Weaponry
& National Defense- Nuclear Explosions & Explosives