Transcription of Strain Gauge Measurement – A Tutorial
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Strain Gauge Measurement – A Tutorial
Application Note 078 Product and company names are trademarks or trade names of their respective Copyright 1998 National Instruments Corporation. All rights 1998 Strain Gauge Measurement A TutorialWhat is Strain ? Strain is the amount of deformation of a body due to an applied force. More specifically, Strain ( ) is defined as thefractional change in length, as shown in Figure 1 1. Definition of StrainStrain can be positive (tensile) or negative (compressive). Although dimensionless, Strain is sometimes expressed inunits such as or mm/mm. In practice, the magnitude of measured Strain is very small. Therefore, Strain is oftenexpressed as microstrain ( ), which is 10 a bar is strained with a uniaxial force, as in Figure 1, a phenomenon known as Poisson Strain causes the girth ofthe bar, D, to contract in the transverse, or perpendicular, direction.
bonded to a thin backing, called the carrier, which is attached directly to the test specimen. Therefore, the strain expe-rienced by the test specimen is transferred directly to the strain gauge, which responds with a linear change in electrical resistance.
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