Before we jump into the more technical part of the instrument, let’s first clearly define Strain Gauge. As mentioned earlier, strain gauges work on the principle of the conductor’s resistance which gives you the value of Gauge Factor by the formula: Now, in practice, the change in the strain of an object is a very small quantity which can only be measured using a Wheatstone Bridge. The gauge is attached to the object under stress using an adhesive. You will find such types of equipment in power plants, ships, refineries, automobiles and industries. How bacteria could help recycle electronic waste, Proceedings of the National Academy of Sciences. Strain Gauge or Strain Gage was invented in 1938 by Edward E. Simmons and Arthur C. Ruge. In the field of civil engineering, strain gauges are used to keep rails in good condition. RF9. The strain gauges are suitable for long-term installation. Encardio-rite primarily deals with six different types of strain gauges: The Model EDS-11V strainmeter is suitable for embedment in soil or concrete or for surface mounting by welding on steel structures. The sensor forms an integral part with the strain gage. Groutable reinforced bar annular mounting blocks are available for surface mounting the strain gage to a concrete structure. Is The Matter In Our Universe Fundamentally Stable Or Unstable? The Encardio-rite strain meter incorporates the latest vibrating wire technology to provide the remote digital readout of compressive and tensile strain in dams, bridges, underground cavities, tunnels, mines, steel structures and other areas of strain gauge application where strain measurement is required. Custom strain gauges can be designed to simplify strain gauge installation, for a specific application or for an environment where space is limited. It is used to measure stress and strain on rails. The remote digital readout for strain gauges is also possible. The main purpose of a strain gauge is to indirectly determine stress and its variation with time, quantitatively. Well-instrumented bridges can alert responsible authorities about approaching failure so as to initiate preventive measures. Change in stress is determined by multiplying the measured strain by the modulus of elasticity. Here are some practical applications of strain gauges: Let’s talk about the application of strain gauge in aerospace. 1 ε= 1 = 1 m/m. Calibration is done … etc. The larger the force or the smaller the area over which it acts, the more likely the material is going to deform. The dummy gauge is then finally replaced by the actual strain gage and clamped in position by a pair of set screws on each block. A strain gauge measures this deformity by using the Gauge Factor formula. 3. RDS. They are highly precise and don’t get influenced due to temperature changes. It is used to measure stress and strain on rails. Long term stability is achieved by thermal and load cycling, the unique method of wire clamping by generating a vacuum of 1/1000 Torr inside the sensor by electron beam welding. A torque on an engine is measured when a strain gauge is attached to a dyno. The main advantages of mechanical strain gauges are the ease with which they can be used, their relatively low cost and the fact that they are reusable. Your email address will not be published. It is a measure of internal pressure on an object whenever an external force acts on it. The gauges go on the top, bottom, and sides of the rail. The Encardio-rite strain meter incorporates the latest vibrating wire technology to provide the remote digital readout of compressive and tensile strain in dams, bridges, underground cavities, sewer/metro/rail/road tunnels, mines, steel structures and other areas of application where strain measurement is required. However, there are very minor limitations that you can mention when it comes to drawbacks. However, with the complete range from Encardio-rite, you can easily examine the strain gauge features and specification and use it as per your preference. In applications where such complementary pairs of strain gauges can be bonded to the test specimen, it may be advantageous to make all four elements of the bridge active for even greater sensitivity. We know, resistance is directly dependent on the length and the cross-sectional area of the conductor given by: The change in the shape and size of the conductor also alters its length and the cross-sectional area which eventually affects its resistance. The Wheatstone Bridge circuit is given below. Strain gauges are extensively used in the field of geotechnical monitoring to keep a constant check on structures, dams, tunnels, and buildings so that the mishaps can be avoided … In the case of real-life monitoring, while constructing concrete structures or monuments, the load is applied at the load application point of a load cell that consists of a strain gauge underlying it. This was all about strain gauges and, if you have any further queries, do let us know in the comments below. The strain gauge foil is glued on the material, which will be tested using a specially adapted glue for strain gauges. Instrumentation of bridges is done to verify design parameters, evaluate the performance of new technologies used in the construction of bridges, to verify and control the construction process and for subsequent performance monitoring. Initial tension can be set during installation, allowing for maximum range in tension or compression as required. These strain gauges are put on the rails in a vertical, longitudinal, and lateral positions to measure different forces. It’s not always necessary to use the Wheatstone Bridge circuit to measure electrical resistance. Strain gauges are extensively used in the field of geotechnical monitoring to keep a … | What are the applications of strain gauges? These precision strain gauges can be used for experimental stress analysis monitoring industrial equipment or various scientific applications. Long term stability is achieved by thermal and load cycling, the unique method of wire clamping by generating a vacuum of 1/1000 Torr inside the sensor by electron beam welding. This article presents an application of strain gauges in measurements of strain which occurs in charge air cooler during the thermal cycle test. They are considered as significant measuring equipment for ensuring productivity and safety. 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