Experimental Mechanics

, Volume 17, Issue 1, pp 26–32 | Cite as

Response of foil strain gages to hydraulic pressure

Paper reports on the performance of foil strain gages immersed in a pressurized hydraulic environment and subjected to various biaxial-stress states as well as fluctuating pressures
  • C. G. Foster
Article
  • 54 Downloads

Abstract

A series of tests to determine the effect that hydraulic pressure has on the output of electrical-resistance foil strain gages is described. Tests were conducted on Micro-Measurements gages, type EA-13-125BT-120 for pressures up to 20.7 MPa and frequencies up to 150 Hz, both for purely dilatational strain as well as various combinations of dilatational and distortional strains.

The results showed that gage performance due to the combined effects of hydrostatic pressure and distortion of the structure differed from the condition predicted when pressure and distortion were considered separately. Rate of pressurization (and, hence, strain rate) had no measurable effect within practical limits.

Keywords

Mechanical Engineer Fluid Dynamics Combine Effect Hydrostatic Pressure Strain Gage 

Notation

E

Young's modulus

K

gage factor

Kt

transverse-sensitivity coefficient

p

hydraulic pressure

ro

test-specimen external radius

ri

test-specimen internal radius

a

axial strain

h

hoop strain

r

radial strain

σa

axial stress

σh

hoop stress

σr

radial stress

σ1

Poisson's ratio with the stress applied parallel to the direction of extrusion

σ2

Poisson's ratio with the stress applied perpendicular to the direction of extrusion and the transverse strain also measured perpendicular to the direction of extrusion

σ3

Poisson's ratio with the stress applied perpendicular to the direction of extrusion and the transverse strain measured in the direction of extrusion

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References

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    Clough, W. R., Shank, M. E. andZaid, M., “The Behavior of SR-4 Wire-resistance Strain Gages on Certain Materials in the Presence of Hydrostatic Pressure,”Proc. of the SESA,X (2),167–176 (1953).Google Scholar
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Copyright information

© Society for Experimental Mechanics, Inc. 1977

Authors and Affiliations

  • C. G. Foster
    • 1
  1. 1.Department of Civil and Mechanical EngineeringUniversity of TasmaniaHobartAustralia

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