Ch 8. Strain Analysis Multimedia Engineering Mechanics PlaneStrain Mohr's Circlefor Strain StrainGages
 Chapter 1. Stress/Strain 2. Torsion 3. Beam Shr/Moment 4. Beam Stresses 5. Beam Deflections 6. Beam-Advanced 7. Stress Analysis 8. Strain Analysis 9. Columns Appendix Basic Math Units Basic Equations Sections Material Properties Structural Shapes Beam Equations Search eBooks Dynamics Fluids Math Mechanics Statics Thermodynamics Author(s): Kurt Gramoll ©Kurt Gramoll

 MECHANICS - CASE STUDY Introduction Strain Gage Rosette on Bracket In order to determine the load P and its location s, a strain gage rosette is attached to the circular bar near the wall. Each gage is oriented 120o apart as shown. What is known: When loaded, the gages report strains of      εa = 224.8 μ      εb = -118.3 μ      εc = 132.9 μ Assume the strain gage rosette is at the wall. The bracket material is steel, E = 29,000 ksi and ν = 0.29. Question What is the load P and distance s? Approach Determine the strains in the x-y coordinate system. Calculate the stresses from the strains. Find the bending stress and the twisting stress caused by the offset load P.

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