Electrical resistors – Strain gauge type
Patent
1978-02-16
1980-03-25
Albritton, C. L.
Electrical resistors
Strain gauge type
219 85R, 219 85CA, 219 85CM, G01L 122
Patent
active
041952790
ABSTRACT:
A method and apparatus for attaching strain gages to substrates is described, which is especially useful for field installation, and especially for materials which experience a drastic reduction in fatigue strength when heated as in spot welding. A strain gage having a backing plate is attached to a substrate by using a foil of brazing material between the backing plate and substrate. A pair of electrodes that are connected to a current source, are applied to opposite sides of the backing plate, so that heating of the structure occurs primarily along the relatively highly conductive foil of brazing material. Field installations are facilitated by utilizing a backing plate with "wings" extending at an upward incline from either side of the backing plate, by attaching the electrodes to the wings to perform the brazing operation, and by breaking off the wings after the brazing is completed.
REFERENCES:
patent: 3060395 (1962-10-01), Sandven
patent: 3089020 (1963-05-01), Hurlebaus
patent: 3141232 (1964-07-01), Russell
patent: 3141949 (1964-07-01), Lovell
patent: 3451030 (1969-06-01), Garfinkel
patent: 4086554 (1978-04-01), Sieder
Frosch Robert A. Administrator of the National Aeronautics and Space
Lemcoe Meyer M.
Pattee Harry E.
Albritton C. L.
Manning John R.
McCaul Paul F.
Mott Monte F.
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