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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-
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No. 124: Strain Gage Type K-1. Founder of Kyowa Musen Kenkyujo, present Kyowa Electronic Instrument, Osamu Watanabe (ja:渡邉理, Watanabe Osamu) produced and begun to sell first Japan made strain gauge type K-1 covered with red colored felt in 1951.
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.
Track gauge – The distance between the rails. Over time, rail may become too wide or too narrow. In North America and most of the world, standard gauge is 4 ft 8 + 1 ⁄ 2 in (1,435 mm). Rail profile – Looks for rail wear and deviations from standard profile.
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 ...
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 ...
The strain measurements are most commonly measured with an extensometer, but strain gauges are also frequently used on small test specimen or when Poisson's ratio is being measured. [6] Newer test machines have digital time, force, and elongation measurement systems consisting of electronic sensors connected to a data collection device (often a ...