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Re: [Phys-l] Need Strain Gage resistance variation law



It's linear w/ length and inverse the cross section *. There is also the problem of work hardening, which also increases the resistance. If the deformation is very small, probably negligible. Usually gauges are calibrated, not sold assuming the above.

* hint: Poisson

http://silver.neep.wisc.edu/~lakes/PoissonIntro.html <http://silver.neep.wisc.edu/%7Elakes/PoissonIntro.html>

bc, googler and made a crude gauge w/ pencil on paper.

efunda confirms bc:

http://www.efunda.com/DesignStandards/sensors/strain_gages/strain_gage_theory.cfm

CARABAJAL PEREZ, MARCIAL ROBERTO wrote:

Hello:
I am working with wired resistors Strain Gages, and teaching about how copper wire resistance changes with wire length variations.
I can�t find the deduction of the formula showing how resistance changes in a deformed wire (traction-compression).
Is somebody able to help me? Thanks very much. My best regards.
Roberto


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