4. Discussion The first thing we see when we look the data we have calculated is the difference that exists between the calculated values for the deflection and the values we found experimentally. Some reasons for this variance could be the fact that these samples have slightly more or less flexibility due to imperfections during the manufacturing process or possible changes in the properties of the beams after repeated testing. Next we have sample stress distribution, shear, and moment diagrams for the beam in the tester which lets us see that the largest stresses and the largest shear values can be found along the left and right edges of the beam while the largest moment in the beam can be found in the center of it which causes its largest deflection to be in the center of the beam. Next, we calculated values of the Young’s Modulus for each of the materials. For fiberglass, we found the value to be 30 GPa which is about 12 off its theoretical value of 18.6, then for aluminum we found it to be 50 GPa which is about 18 off its value of 68, and we found the value for steel to be about 200 GPa which is the same as the theoretical value for the material. In our testing, we also came close to the yielding points of steel and aluminum which occur at about 10 and 9 kN respectively. Finally, we had attached strain gages to the bottom and top of the beam and the values they gave us are related since the gages should be reading the same strain but the signs will be switched since one side is in compression while the other side is in tension. 5. Summary