Lab Report 10

# Lab Report 10 - There must be ten recorded values. From...

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26 November 2007 Mrs. JoAnn Scales Section 4 Tuesday 1-4 pm MSE 232 Vanderbilt University Nashville, TN 37235 Dear Mrs. Joann Scales, The results of experiment ten: Mohr’s Circle Strain Gage Determination of Stress States, performed on Tuesday, November 13, 2007 are contained within this letter. The purpose of this experiment is to familiarize the class with another method to calculate complex stresses. The materials needed to complete this experiment are a flat aluminum alloy sample with rosette, a strain gage reading computer setup hydraulic load frame, vernier calipers, a ruler, and protractor. The procedure for this lab is very short. To begin, the values on the computer were each set to zero. Then one person begins pumping the lever to increase load on the gage. The person increasing the load must be aware of yield point of the specimen in order to keep the load below this value. While the load is being increased, another person must click on the button that records data.

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Unformatted text preview: There must be ten recorded values. From these values a Mohr Circle can be drawn. As expected the strain increases linearly as load is increased, shown in Graph 10.1. When the strains are plotted as a function of the tensile stress the lines are straight because the Mohr circle is the same shape for each applied load. This is because the load is applied in the same place, only changing the magnitude of the circles, not the shape or directions. Appendix Rosette Strain Gage load (kg) Strain 1 Strain 2 Strain 3 69 26 13 115 2 158 89 153 4 223 127 190 4 272 156 203 4 289 166 223 5 325 182 270 6 360 211 365 6 452 263 424 8 500 293 458 8 525 312 469 8 534 314 477 8 544 314 482 8 544 317 Table 10.1 : Strain Gage Data Strain Reading vs. Applied Load 100 200 300 400 500 600 100 200 300 400 500 600 Load (kg) Strain (*10^6) Strain 1 Strain 2 Strain 3 Graph 10.1 : Strain Reading vs. Applied Load...
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## This lab report was uploaded on 04/07/2008 for the course MSE 232 taught by Professor Wittig during the Spring '08 term at Vanderbilt.

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Lab Report 10 - There must be ten recorded values. From...

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