Experimental Mechanics

, Volume 7, Issue 11, pp 476–480 | Cite as

A simple estimate for the effect of cross sensitivity on evaluated strain-gage measurement

A general diagram gives at a glance the probable errors in strain or stress for various test parameters
  • M. L. Meyer


The cross-sensitivity factor of a short-wire strain gage can sometimes be estimated by comparison of its gage factor with that of a long gage of similar construction and material.

A plot of the error introduced by the usual neglect of cross sensitivity against the known or estimatedtrue ratio of transverse to longitudinal stress or strain yields a quick estimate for any given cross-sensitivity factorn of the gage, any Poisson's ratio ν of the test piece and any stress or strain ratio. It shows whether in any particular test the influence of cross sensitivity warrants further special attention.

If the longitudinal strain exceeds the transverse strain, the error is seen to be always less than 1.3n, but if the transverse strain is larger, the error may be so high as to vitiate the result. In computations from rosette measurements, the diagram shows that the larger principal stress can be determined with an error below 1.3n, as can Tresca's and von Mises's criteria of yield, while the error in the smaller principal stress tends to be large for principal strain ratios above +10 or below −1.5.


Principal Stress Strain Gage Longitudinal Strain Test Piece Principal Strain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Young's modulus


gage factor


cross-sensitivity factor


resistance of strain gage




Poisson's ratio





apparent value (assumingn=0)


calibration value


true value (for knownn)

x, y

mutually perpendicular directions

1, 2

principal directions


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Copyright information

© Society for Experimental Mechanics, Inc. 1967

Authors and Affiliations

  • M. L. Meyer
    • 1
  1. 1.Department of Mechanical EngineeringThe City UniversityLondon

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