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 Cclamp 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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 Spring '09
 Reinkens
 Standard Deviation, Stress, Second moment of area, Beam Design, Experimental Design Beam Design Group, Beam Design and Analysis

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