Strain Gauge Material

Further discussion on sensitivity can be found in the strain gage sensitivity page.

Strain gauge material.

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. A strain gauge also spelled strain gage is a device used to measure strain on an object. All strain gauges within a strain gauge series offer the same carrier and measuring grid foil material. 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.

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. Ruge in 1938 the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The sensitivity of metal strain gauges can be 10 6 strain. One of the most popular materials used for the strain gauges is the.

The gauge is attached to the object by a suitable adhesive such as cyanoacrylate. Materials used for the strain gauges. Specialized semiconductor strain gauges based on silicon have gauge factors of 50 to 200 but these devices are nonlinear making them more difficult. Invented by edward e.

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. Thus a strain of 0 1 will cause a 0 24 ω change in a 120 ω strain gauge. As the object is deformed the foil is.

For experimental tests robust and flexible strain gauges which can be used under arduous conditions have distinct advantages. The material construction of the wire directly affects the sensitivity of the strain gage. Simmons and arthur c. A strain gauge fig.