The Measurement of Large Strains With Foil Resistance Strain Gages
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Gas factor changes in foil resistance strain gages were observed and measured. Errors due to these changes are discussed and corrections for the gages studied were determined. Residual volume changes during plastic deformation in 7039 Aluminum Alloy and S-7 tool steel were shown to be small and unmeasurable with the gages used. The gage factor changes were assumed to be the result of plastic work in the gage material. Estimates of the magnitude of the resistance changes due to plastic deformation in constantan were made using tension experiments on wires.
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods