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An unmounted resistive foil strain gauge. A strain gauge takes advantage of the physical property of electrical conductance and its dependence on the conductor's geometry. . When an electrical conductor is stretched within the limits of its elasticity such that it does not break or permanently deform, it will become narrower and longer, which increases its electrical resistance end-to-
Arthur Claude Ruge (pronounced ROO-gee; July 28, 1905 – April 3, 2000) was an American mechanical engineer and inventor who developed and pioneered the modern bonded wire resistance strain gauge. [1] From 1939 to 1940 he chaired the Seismological Society of America (Eastern Section) [2]
Distortion seismometer. A strainmeter is an instrument used by geophysicists to measure the deformation of the Earth. Linear strainmeters measure the changes in the distance between two points, using either a solid piece of material (over a short distance) or a laser interferometer (over a long distance, up to several hundred meters).
Gauge factor (GF) or strain factor of a strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain ε. The gauge factor is defined as: [ 1 ] G F = Δ R / R Δ L / L = Δ R / R ε = 1 + 2 ν + Δ ρ / ρ ε {\displaystyle GF={\frac {\Delta R/R}{\Delta L/L}}={\frac {\Delta R/R}{\varepsilon }}=1+2\nu +{\frac ...
MicroMeasurements makes strain gauges as short as 0.008 inches and Omega makes a 6 inch long strain gauge. The "typical" length depends entirely on the application. Measurements on concrete and other heterogeneous materials require a very long gauge length, but measurements of strains at local stress concentrations require a very short gauge ...
A tensile specimen usually has a standardized sample cross-section. It has two shoulders and a gauge (section) in between. The shoulders and grip section are generally larger than the gauge section by 33% [4] so they can be easily gripped. The gauge section's smaller diameter also allows the deformation and failure to occur in this area. [2] [5]
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