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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-
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).
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 ...
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]
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Stress–strain analysis (or stress analysis) is an engineering discipline that uses many methods to determine the stresses and strains in materials and structures subjected to forces. In continuum mechanics , stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other ...
A strain gauge sensor measures the deformation of the elastic element, and the output of the sensor is converted by an electronic circuit to a signal that represents the load. Capacitive strain gauges measure the deformation of the elastic material using the change in capacitance of two plates as the plates move closer to each other.
Strain gauges are used to monitor the applied loading or stress fields around the crack tip. They may be placed beneath the path of the crack or on the back face of a compact tension coupon. [6] An extensometer or displacement gauge can be used to measure the crack tip opening displacement at the mouth of a crack. This value can be used to ...