Strain Gauge Material

Specialized semiconductor strain gauges based on silicon have gauge factors of 50 to 200 but these devices are nonlinear making them more difficult.

Strain gauge material. Thus a strain of 0 1 will cause a 0 24 ω change in a 120 ω strain gauge. A strain gauge also spelled strain gage is a device used to measure strain on an object. Therefore many specifications are identical for one strain gauge series. 12 is a sensor which responds to the expansion or contraction of a material or the strain a strain gauge consists of a long thin piece of metal which folds back on itself or zig zags across the sensor.

The sensitivity of metal strain gauges can be 10 6 strain. Invented by edward e. Further discussion on sensitivity can be found in the strain gage sensitivity page. As the material expands or contracts the long thin piece of metal gets longer or shorter with the material changing the resistance of the metal.

Earlier wire types of strain gauges were used commonly which are now being replaced by the metal foil types of gauges as shown in the figure below. One of the most popular materials used for the strain gauges is the. Materials used for the strain gauges. Applications are mainly static or quasi static strains.

Ruge in 1938 the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. For experimental tests robust and flexible strain gauges which can be used under arduous conditions have distinct advantages. Select constantan advance copel alloy wire if. Metal strain gauges have a gauge factor of about 2.

The metals can be easily cut into the zigzag foils for the formation of the strain gauges. A strain gauge fig. Simmons and arthur c. The material construction of the wire directly affects the sensitivity of the strain gage.