Abstract

It is conventional practice to consider shunt calibration of a strain-gage bridge in a manner which can result in erroneous tension-strain measurements. For strains from 1 percent to 10 percent as encountered increasingly in today’s structural materials and composites, the measured tension strains can be significantly lower than the actual strain. These errors are eliminated by using the method of determining ‘equivalent strains’ which is presented here. Shunt-calibration output is equated separately to tension-and compression-strain outputs to determine the ‘equivalent strain’ to be used for the reduction of each.

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