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BEAM TESTING EXPERIMENT - Beam Testing and Design...

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Beam Testing and Design Experimental Design Beam Design Group# 03, Tatsuya Futai, Sean Elliott, Nick Jordan ENGR120 Section 2
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In this experiment, the main objective is to find out the maximum stress level that three different beams could handle before they broke. First we carefully position our wood sample leaving the 10” beam length extended from the table. Next we took fastened our C-clamp to the sample and to the edge of the table as far back as possible on the wood sample. After that we loaded our empty rubber bucket on the sample fitted in between the notch in our wood sample. From there on in ½ lb increments, we carefully loaded our bucket with weights until the wood flexural (bending) failure is reached. We then recorded our failure load in pounds in a data table. This process was repeated for all three wood samples given to us. In the Photo to the left we have our beam fastened to the table with the C clamp, our bucket hanging from the notch made in the wooden beam. We then began to fill the bucket with weights in ½ pound increments. A few of the key scientific and engineering concepts on the project was learning how to calculate the equation for units of Stress σ=6FL/bH². We also learned how to calculate the modulus of rupture in the given formula FLdo/I to mathematically predict at what force our beam design would break. Where σ = Stress (psi) F = Force (lbs) L = Beam length (inches) do = neutral axis position, and I = Second Moment of Inertia. We also learned how to calculate standard deviation of our results using Excel formula = STDEV (A1:A3).
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