Extended calibration of thin-foil manganin gage in ALOX material
The purpose of this program was to extend an existing manganin gage calibration curve, correlating stress as a function of change in gage resistance/gage resistance ({Delta}R/R), and obtain gage repeatability data from stripped manganin thin-foiled gages manufactured by the Measurements Group Inc., Micro-Measurements division. The experiments extended the existing calibration curve range from the current 0.5 GPa to 6.1 GPa by examining impact stresses of 0.1 GPa in the lower range, and 8.0 and 10.0 GPa in the higher range. The manganin gages were embedded in ALOX (42% by volume alumina in EPON 828 epoxy) material. A light gas-gun was used at Sandia National Laboratories Explosive Components Facility (ECF) to drive an impactor material, ALOX or Tungsten, into the ALOX target containing two gages in a centered arrangement. Tilt and velocity of the impactor were measured along with the gage outputs. A total of 11 tests were conducted using the same ALOX target material that was used when obtaining the original calibration curve. Two initial tests were completed using Polymethyl Methacrylate (PMMA) as the impactor and target at an impact pressure of 3.3 GPa for comparison of gage output with analysis and literature values. The installed gage, stripped of its backing, has a nominal thickness of 5 microns. The thin gage and high speed instrumentation allowed higher output resolution measurements than can be obtained with 76 microns manganin wire used previously. The areas of investigation that will be presented include: (1) experimental setup, (2) comparison with existing calibration curve, and (3) discussions of the extended calibration data.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 654157
- Report Number(s):
- SAND--97-2368C; CONF-980708--; ON: DE98005034; BR: DP0401012
- Country of Publication:
- United States
- Language:
- English
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Calibration of thin-foil manganin gauge in ALOX material
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