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Strain Gage Errors

  1. Jun 20, 2014 #1
    1. The problem statement, all variables and given/known data
    What are the potential errors in measuring strain with strain gages? How can these
    errors be minimized?



    3. The attempt at a solution

    In my class notes, I have the four Errors.

    1-Gage mounting (glue thickness & flex)
    Use a thin layer of glue and make sure the layer is smooth not bumpy.

    2-Beam expansion with temperature
    Allow Beam and Gage to get to room temperature before setting gage

    3-Effect of temperature on Gage resistance
    Shouldn't this be the same as number two?

    4- Connecting wire lead resistance errors
    by measuring the lead resistance and accounting for it in the strain calculations.

    But in class, the teacher never went over how to minimize the errors. So I googled around a bit, couldn't really fine any help. So I was hoping someone that knew more than me, could fill me in. The writing in red is my guess at an answer.

    Thank You
     
  2. jcsd
  3. Jun 21, 2014 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    1. Use the manufacturer's recommended adhesive, I'd say, and apply as directed.

    2 is concerned with physical expansion with temperature, 3 says the electrical characteristic of the gage conductor will inevitably change with temperature
     
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