10 - MEEN260 IntroductiontoEngineering Experimentation...

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1 MEEN 260 Introduction to Engineering Experimentation Strain Measurement Reza Langari* Department of Mechanical Engineering Texas A&M University rlangari@tamu.edu *Incorporates a number of slides from Brian Rasmussen, TAMU MEEN, Copyright 2008. Strain Measurement Principle of operation Converts strain to electrical resistance Stain Gage Materials Thin metal strips on polymer film Micromachined piezoresistive materials Application The bonded metal strips follow the deformation of the surface Widely used in experimental studies on solid mechanics, load cell designs, etc Advantages Very sensitive: measure strains of ± 1mm/m Small size and light High bandwidth (fast response) Wide range of linear response
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2 Tensile Test Resistance is proportional to length F R A small deformation (strain) will result in a proportional change in resistance e / F 1 , R 4 R 2 , R 3 T ε L A L R ρ = ρ = strain sensitivity L = total length A = cross sectional area The proportionality constant is call the Gage Factor, K K
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This note was uploaded on 12/26/2010 for the course MEEN 260 taught by Professor Langari during the Fall '08 term at Texas A&M.

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10 - MEEN260 IntroductiontoEngineering Experimentation...

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