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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-
This research led to the invention of the strain gauge concurrent with the work of Edward E. Simmons at the California Institute of Technology. Notably, the Massachusetts Institute of Technology Patent Committee did not feel that the commercial use is likely to be of major importance.
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Formed in 1943 as the Society for Experimental Stress Analysis (SESA), early work focused on methods such as photoelasticity and strain gages. [2] Society historical records refer to the society as SESA through the 1984 Fall SESA meeting in Milwaukee, WI [3] and start referring the society as SEM with the 1985 Spring SEM meeting in Las Vegas ...
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.
The Hopkinson pressure bar was first suggested by Bertram Hopkinson in 1914 [1] as a way to measure stress pulse propagation in a metal bar. Later, in 1949 Herbert Kolsky [2] refined Hopkinson's technique by using two Hopkinson bars in series, now known as the split-Hopkinson bar, to measure stress and strain, incorporating advancements in the cathode ray oscilloscope in conjunction with ...
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Though the Simmons was the first to invent the resistance wire strain gauge, both men are credited with the discovery and share the original patent. The trade name of the device, SR-4, which stands for “Simmons Ruge – 4 people,” acknowledges both men and indicates that four people (Simmons, Ruge and their respective assistants) were ...