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Experimental Mechanics

, Volume 22, Issue 1, pp 16–18 | Cite as

A simplified method for eliminating error of transverse sensitivity of strain gage

Author presents a simplified method to eliminate the stress-determination errors
  • Gu Wei-ming
Article

Abstract

This paper presents a simplified method for eliminating error of transverse sensitivity of resistance strain gage. It is proved mathematically and mechanically that principal stress and directional angle are true values without any errors if calculated directly from the apparent values of Young's modulus and Poisson's ratio of specimen materials, and from all the apparent-strain readings.

Keywords

Mechanical Engineer Fluid Dynamics Principal Stress Strain Gage Resistance 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.

Nomenclature

K

gage factor of resistance strain gage, calibrated by manufacturer

H

transverse sensitivity of strain gage,H=K t /K a

\(\nu _o \)

Poisson's ratio of specimen used for calibrating gage factor of strain gage

ν

Poisson's ratio of specimen

E

Young's modulus of specimen

ε

normal strain

σ

normal stress

e

error of strain determination, percent

m

ratio of lateral strain to axial strain,\(m = \in _t / \in _a \)

\(\phi _o \)

directional angle between 0-deg direction of strain rosette and maximum principal strain,\( \in _1 \)

L

coordinate of the center of strain Mohr's circle

R

radius of strain Mohr's circle

Subscripts

1,2

directions of maximum and minimum principal stresses in biaxial-stress field

0,45,90

directions of three resistance grids of rectangular rosette

0,60,120

directions of three resistance grids of delta rosette

a, t

axial and perpendicular directions of resistance grid of strain gage

x, y

axial directions of coordinates in rectangular coordinate system

Superscript

used for indicating apparent readings measured from strain gage having transverse sensitivity

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References

  1. 1.
    Wu, C.T., “Transverse Sensitivity of Bonded Strain Gages,”Experimental Mechanics,2 (11),338–344 (1962).Google Scholar
  2. 2.
    Beaney, E.M., The Effect of Cross-sensitivity on the Determination of Stress by Strain Gauges,Strain,6 (2) (1970).Google Scholar
  3. 3.
    Machin, K.E. andHassan, Y.E., “Cross-sensitivity Errors in Straingage Measurements,”Experimental Mechanics,16 (1),38–40 (1976).Google Scholar
  4. 4.
    Hassan, Y.E. and Machin, K.E., “Transverse Sensitivity Errors in Rectangular Rosette,” Strain,14 (2) (1978).Google Scholar
  5. 5.
    Perry, C.C. andLissner, H.R., The Strain Gage Primer, McGraw-Hill Book Co., New York (1955).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1982

Authors and Affiliations

  • Gu Wei-ming
    • 1
  1. 1.Zhengzhou Mechanical Engineering InstituteZhengzhou, Henan ProvinceChina

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