A compressive force is applied to a structure, the strain = 5 micro strains. Two separate strain gauges are attached to the structures, one is a nickel wire strain gauge of gauge factor = –12.1 and the other is a nicrome wire strain gauge of gauge factor = 2. Calculate the value of resistance of the gauges after they are strained. The resistance of strain gauge =120 ohms.
What will be an ideal response?
Let us consider tensile strain as positive and compressive strain as negative.
Use the equation
Nickel strain gauge
Change in resistance,
For Nicrome gauge
Change in resistance,
The value of resistance of a nickel strain gauge increases, whereas, the value of resistance of a nicrome strain gauge decreases.
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