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BACKGROUND
A Strain Gauge is a form of the transducer which can convert applied force, pressure, tension into a change in electrical resistance which can be displayed on the screen. The strain gauges show a variation in the resistance, whenever there is a fluctuation in temperature, due to increase or decrease in their physical dimension. The design consideration of strain gauge is based on many different factors, such as it is kept in mind that the resistance varies along with a change in strain and the other is that they are attached to a system such that they are affected by strain.1
In this experiment, strain gauges are connected with either series or parallel connection in the bridge circuit that behave like a potentiometer. Stress and strain is the result of an externally applied force acting on the body. The internal resisting force established within the material is known as stress, and the deformation or displacement occurred is known as strain.2 The strain gauge is an important sensor which is applied to the measurement of mechanical quantities. The strain term is used for tensile and compressive strain, which is known as positive or negative strain, used for the expansion as well as contraction.
A bonded metallic strain gauge is most widely used, and it consists of a wonderful wire or metallic foil connected in a grid pattern. The grid is bonded to the carrier at the thin backing, which is attached to the test specimen. Thus, the experienced strain in the test specimen is transferred directly to the strain gauge where it gets converted into a linear change in electrical displacement.3
The prime objective of this experiment is to measure the acting strain on a test specimen by using a strain gauge.
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REQUIREMENTS
Materials: Strange Gauge Kit
Cantilever Beam Weights
Ammeter
Voltmeter
Multimeter
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PROCEDURE
First of all, arrange the cantilever beam, ammeter, and voltmeter in a proper circuit. Now, put the weight on the rpd of the cantilever beam, and measure the display reading for a particular weight. After measuring the ammeter and voltmeter reading, increase the strength of weights and repeat the previous steps in the same order. Now, measure the dimension of the cantilever beam to determine its extension.
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CONCLUSION
We have studied the method of measuring strain using a strain gauge. A strain is an elongation produced in a body due to the applied stress.
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REFERENCES
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P. H. P. J. E. F. D. A. Gorham, “An improved method for compressive stress-strain measurements at very high strain rates,” 18 February 1992.
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D. H. B. R. B. H. L. W. S. Agras, “A MECHANICAL STRAIN GAUGE FOR RECORDING PENILE CIRCUMFERENCE CHANGE,” Journal of Applied Behaviour Analysis, vol. 3, pp. 73-76, 1970.
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C. D. F. M. F. A. F. D.B.Burr, “In vivo measurement of human tibial strains during vigorous activity,” Department of Anatomical Sciences, University of Queensland, Brisbane, Queensland, Australia, vol. 18, no. 5, pp. 405-410, 1995.
