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A strain gauge (also spelled strain gage) is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern.
These types of electronic pressure sensors generally use a force collector (such a diaphragm, piston, Bourdon tube, or bellows) to measure strain (or deflection) due to applied force over an area (pressure). Piezoresistive strain gauge: Uses the piezoresistive effect of bonded or formed strain gauges to detect strain due to an applied pressure ...
Strain gauges can be used to experimentally determine the deformation of a physical part. A commonly used type of strain gauge is a thin flat resistor that is affixed to the surface of a part, and which measures the strain in a given direction. From the measurement of strain on a surface in three directions the stress state that developed in ...
A type of strain gauge called a crack-mouth clip gage is used to measure the crack opening. [3] The crack tip plastically deforms until a critical point after which a cleavage crack is initiated that may lead to either partial or complete failure. The critical load and strain gauge measurements at the load are noted and a graph is plotted.
If the gas pressure is reduced, the number of molecules present will fall proportionately and the wire will lose heat more slowly. Measuring the heat loss is an indirect indication of pressure. There are three possible schemes that can be done. [2] Keep the bridge voltage constant and measure the change in resistance as a function of pressure
Load platform or load hanger is where the object will endure pressure at a constant rate. [citation needed] Grips hold the material in a certain position. Position is important because if the alignment is off, the machine will deliver inaccurate creep readings. [citation needed] Dial Gauge is used to measure the strain. It is the object that ...
In non-SI technical work, a gauge pressure of 32 psi (220 kPa) is sometimes written as "32 psig", and an absolute pressure as "32 psia", though the other methods explained above that avoid attaching characters to the unit of pressure are preferred. [8] Gauge pressure is the relevant measure of pressure wherever one is interested in the stress ...
In mechanics, strain is defined as relative deformation, compared to a reference position configuration. Different equivalent choices may be made for the expression of a strain field depending on whether it is defined with respect to the initial or the final configuration of the body and on whether the metric tensor or its dual is considered.