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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-
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.
A strain gauge, typically glued onto a sample of material to measure its deformation. The blue material is a conductor, so current must flow through the narrow vertical channels. If the gauge is stretched vertically, the channels get longer and narrower. This increases the gauge's electrical resistance, which can be measured to work out the strain.
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 ...
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.
English: Diaphragm strain gauge for pressure transducers. The two outer gauges measure radial strain, the two inner ones measure tangential strain. Not all internal connections for the Wheatstone bridge have already been made, so that resistors for calibration and temperature compensation can be added.
A schematic diagram for the stress–strain curve of low carbon steel at room temperature is shown in figure 1. There are several stages showing different behaviors, which suggests different mechanical properties. To clarify, materials can miss one or more stages shown in figure 1, or have totally different stages.
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 ...
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