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The gauge factor of a strain gauge is defined as the ratio of

  • A.the change of resistance to the change of length of the gauge
  • B.the strain in the gauge to the strain in the member it is bonded to
  • C.the resistance of the gauge to its length in the unstrained state
  • D.the fractional change of resistance to the strain

Answer: D

Written out it is \( (\Delta R/R)/(\Delta L/L) \), a dimensionless number of about two for a metallic gauge. It combines the change of dimensions with the change of resistivity under strain, and it is the figure that turns a resistance reading into a strain.

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