# Lab 3 - MEEN 316 Strength of Materials Laboratory Lab#3...

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MEEN 316 - Strength of Materials Laboratory Lab #3 Principal Strains and Stresses Submitted by Daniel Richard Team Members Glenn Manual Randal Scott Date Performed: September 16, 2010 Date Submitted: September 23, 2010 Engineering Department McNeese State University 1

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Table of Contents (pg #) ` 1.Title Page…………………………………………1 2.Table of Contents…………………………………2 3.Objectives……………………………………. ....... 3 4.Theory……………………………………………. .3,4,5 5.Procedure………………………………………….5,6,7 6.Results……………………………………………. .8,9,10 7.Conclusion…………………………………………10 8.Reference…………………………………………. .10 2
1. Objectives: The purpose of this lab is to measure the strain on three different axes about a point on an aluminum beam. After measuring the three strains the principal stress can be calculated. Once the principal stress has been calculated the results can be compared with stress calculated by the flexure formula for an aluminum beam. To find the error in the experiment the poisson’s ratio calculated is compared with the theoretical value of poisson’s ratio. 2. Theory: Principal stress refers to the magnitudes of stress that occur on certain planes aligned with a solid body of which they occur. For a rectangular beam, a corner of the beam could be thought of as the origin of this coordinate system with each of the planes parallel to the three touching faces of the beam at that point. It is preferable to measure axes separated by to π

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Lab 3 - MEEN 316 Strength of Materials Laboratory Lab#3...

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