Calculate Tensile Stress with Strain Gauge

AI Thread Summary
To calculate tensile stress using a strain gauge, first determine the change in resistance, which is 0.13 ohms in this case. The strain can be calculated using the formula: strain = (change in resistance / original resistance) / gauge factor. With a gauge factor of 2.0, the strain is 0.00054167. Finally, tensile stress can be found using the formula: tensile stress = strain x modulus of elasticity of the material, which for steel is typically around 200 GPa. This method provides a systematic approach to calculating tensile stress from strain gauge measurements.
orla22
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A strain gauge has a unstrained resistance of 120 ohms, gauge factor of 2.0 is connected to steel girder so it experieces tensile stress. If strained resistance of gauge is 120.13 ohm. How do i calculate the tensile stress value?

I have looked all over the internet for equations relating but have not succeded, any help would be great
 
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If you look at the link it might help ...

http://en.wikipedia.org/wiki/Strain_gauge"
 
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