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This week we will run two deflection experiments. An aluminum beam will be used to verify that one of the simply-supported deflection formulas is valid. You will be given the beam's modulus, which you should be comfortable with since you have already measured moduli several times. You will load the beam, measure deflection at two points, plot the data, and see how it compares to the theoretical prediction. The second beam will be a red oak, poplar, fir or pine cantilever. You will use a deflection formula and load-deflection readings to determine the wood modulus....now knowing that deflection formulas work in real life. We typically see about 4% difference on the aluminum and 15-20% on the wood beams. |
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Video Lecture (22 minutes) Notes
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