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Formal Lab Report

# Formal Lab Report - Internal Reactions and Stresses in...

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Internal Reactions and Stresses in Beams by Richard Pfleging Richard Pfleging ____________________________________ Date Experiment Performed: 22 March 2011 Date Report Submitted: 5 April 2011 Submitted to: Dr. Jayaram Bryan Arko Xiaopeng Lai

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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 VI) Objective of the Experiment 3 VII) Apparatus 4-5 VIII) Procedure 5 IX) Results 5-6 X) Discussion of Results 7 XI) Conclusion(s) 7 XII) Appendices 8-10
Summary: In this lab, the general principles of internal forces and reactions within a beam are studied. The main variables of concern in this experiment are Bending Moment and Shear Force, which hold the bar up. To study these variables, shear force diagrams and bending moment diagrams are created to visualize the internal forces in the beams. Strains are recorded for varying loads and the experimental moments are calculated from these strains. These moments are compared to theoretical moments obtained from the diagrams. When all this was done, it resulted in a general trend of increasing moments as the load was increased. However, the experimental and theoretical values varied significantly. In fact, percent error was between 21000% and 89000%, depending on the value of the load. Thus, the link between the theoretical and experimental could not be confirmed in this experiment, but the process was still conducted. Nomenclature: Moment – M ; –strain; - stress ; E= Modulus of Elasticity ε σ Support Reactions – A y and B y Moment of Inertia – I Introduction: This lab deals with beams, particularly with the internal reactions and stresses which accompany them. A general definition of a beam is a long and slender member which is supported and carries loads which are perpendicular to its longest dimension.

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