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Theoretical gage factor for resistive wire strain gages?

  1. Nov 18, 2012 #1

    Stephen Tashi

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    What model correctly predicts the sensitivity of a resisitive wire straing gage to applied strain?

    This question is motivated by an an old pamphlet found in a used book store, "Theory Of Strain Gage Flight Test Instrumentation" by Eugene Frank, 27 May 1946.

    The gage factor of a strain gage made from resistive wire is defined as
    [itex] K = \frac{\triangle R/ R}{\triangle L/L} [/itex]
    where R is the total resistance of the un-strained gage, L is the total length of un-strained "the specimen" being measured and the deltas are the respective changes in these quantities when a load is applied.

    Frank says:

    Frank's model assumes the change in resistance of the wire is entirely due to the change in the length and diameter of the wire as it is stretched.

     
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