notes and example problems of strain measurement

notes and example problems of strain measurement -...

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Measurement and Instrumentation Lab 20-MECH-370, Winter 2005 Notes for Class Lectures 6 & 7 Chapter Sections: 1 (p. 16-17), 3.4, 5.7-5.8, 10.5 Notes and Example Problems for Strain Measurement Mark J. Schulz February 7, 2005
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1 Notes - Overview of Strain Gages A strain gage measures strain indirectly through the change in resistance of a metallic foil. The gage factor equation (1-6) relates the change in resistance of the gage to the change in strain in one direction. The wheatstone bridge is a circuit that allows more accurate measurements of the change of resistance of the strain gage. Strain can be measured using a strain gage rosette which measures strain in three directions, 0, 45 and 90 degrees. The three measurements will allow the principal strains and shear strain to be computed. Once the strains are obtained, the stress-strain relationships can be used to
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Unformatted text preview: determine stresses. • Mohr’s circle can be used as a graphical method to find the principal stresses (for the plane stress case) and their orientation and the maximum shear stress. • The stresses can be used to predict the factor of safety or the fatigue damage of the component or to compare the experimental stresses with design stresses based on an analysis such as a finite element analysis. 2 1-5. Solution. 3 4 3-7 Solution. 5 3-8 Solution. Use Thevenins equivalent circuit after applying strain. 6 5-9 Solution. 7 5-15 Solution. 8 9 Example. Chapter 10 Section E4-11B. Derive the expression for the strain measured using two strain gages in a quarter bridge for the tension test experiment below. The strain should be derived in terms of the change in resistances of the two strain gages....
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