Gauge factor
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Gauge factor (GF) or strain factor of a strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain ε. The gauge factor is defined as:[1]
where
- ε = strain =
- = absolute change in length
- = original length
- ν = Poisson's ratio
- ρ = resistivity
- ΔR = change in strain gauge resistance due axial strain and lateral strain
- R = unstrained resistance of strain gauge