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gage applies this principle to strain measurement through the resistance change. Generally, the sensing element of the strain gage is made of a copper-nickel alloy foil. The alloy foil has a rate of resist-ance change proportional to strain with a certain constant. Types of strain measuring methods. There are various types of
During the development of an apparatus for measuring static stresses in rubber, attempts were made to use a conventional resistance wire strain gauge of the bonded type. The gauge was attached to either a metal ribbon or a metal ring arranged to take up the force in the rubber. The extension or defor- mation of the ribbon
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3 Jul 2013 BONDED STRAIN GAUGE • A bonded strain-gage element, consisting of a metallic wire, etched foil, vacuum-deposited film, or semiconductor bar, is cemented to the strained surface. 14. UNBONDED STRAIN GAUGE • The unbonded strain gage consists of a wire stretched between two points in an
strain causes it to decrease in exactly the same proportion. - Unbonded gauges(see Fig. 1.2 ). This type is used to give an electrical output signal proportional to a very small displacement of one body relative to another body. One of it is application is an accelerometer. The very fine wire forming the strain gauge resistance
Unbonded Metal Strain Gauge. An unbonded metal strain gauge is shown in Fig.2. This gauge consists of a wire stretched between two points in an insulating medium such as air. The wires are of copper nickel, chrome nickel or nickel iron alloys. The flexture element is connected via a rod to a diaphragm which is used for
These strain gauges are not directly bonded (that is, pasted) onto the surface of the structure under study. Hence they are termed as unbounded strain gauges. Description of the Unbonded Strain gauges: The arrangement of an unbonded strain gauges consists of the following. Two frames P and Q carrying rigidly fixed
Unbonded strain gauge. • This gauge consist of a wire stretched between two point in an insulating medium such as air. • The wires may be made of various copper, nickel, chromium nickel or nickel iron alloys. • The element is connected via a rod to diaphragm which is used for sensing the pressure. The wire are tensioned
available in a wide range of sizes and resistances. Unbonded strain gages, where the wire is free, are rarely used because of their limited frequency range and lack of sensitivity. The strain gage is used universally by stress analysts in the experimental deter- mination of stresses. Since strain always accompanies vibration,

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March 2018