Abstract:
An attempt has been made to study the effects of tensile
stress and temperature on the resistivity of some metals and
alloys. The specimens include; copper, constantan, manganin,
tantalum and minalpha. The strain coefficient of resistivity
dp, rate of increase of fractional resistivity with stress of
Qde
resistance (gauge factor (K)) were determined for copper,
constantan, manganin and tantalum.
For constantan, dp is found to be highest for a sample of
Qde
diameter 0.19 mm and lowest for diameter 0.31mm. Tantalum has the
highest K-value hence it is the material expected to give
relatively the highest strain sensitivity in strain gauges.
Minalpha has, however, shown the greatest extent of scatter.
