Formal Lab Report Second

Formal Lab Report Second - Strain Gage Rosette and 2-D...

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Unformatted text preview: Strain Gage Rosette and 2-D Stress/Strain Analysis by Richard Pfleging Richard Pfleging ____________________________________ Date Experiment Performed: 12 April 2011 Date Report Submitted: 26 April 2011 Submitted to: Dr. Jayaram Bryan Arko Xiaopeng Lai Parks College of Engineering & Aviation Department of Aerospace Engineering Table of Contents I) Title Page 1 II) Table of Contents 2 III) Summary 3 IV) Nomenclature 3 V) Introduction 3-4 VI) Objective of the Experiment 4 VII) Apparatus 4 VIII) Procedure 4 IX) Results 5-8 X) Discussion of Results 9 XI) Conclusion(s) 9 XII) Appendices 10 Summary: In this lab, the general principles of principal strain and stress are studied using a strain gage rosette. The main variables of concern in this experiment are the strains and stresses in the x-direction, the y-direction, and the shear type. Additionally, Poissons ratio and Youngs Modulus are studied. To study these variables, an experiment was set up using a strain gage rosette at an unknown angle phi. Strains are recorded for varying pressures and the experimental values are calculated from these strains. Using the material properties for steel, these values were compared to the actual values. Additionally, two Mohr Circles were drawn. However, the experimental and theoretical values varied. Thus, the link between the theoretical and experimental could not be confirmed in this experiment, but the process was still conducted. Nomenclature: a, b, and c Strain gage names - Strain at particular gages or directions Angle with respect to x-axis xy Shear strain angle between gage a/x-axis and the true horizontal P Load being applied to steel plate I ntroduction: Strain gages are often used to determine the strain and therefore stress in a location of interest in a material. If the principal directions are known, then two gages can be placed in the principal directions to determine the strains. These strains are then used with Hookes law to find the stresses. In addition, only one gage is needed if the stress is uniaxial. However, if nothing is known about the stresses, then three gages are required to...
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Formal Lab Report Second - Strain Gage Rosette and 2-D...

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