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Deformation of Materials Lab write-up

# Deformation of Materials Lab write-up - Deformation of...

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Deformation of Materials Alex Hyatt ME 222 Lab Submitted to: Adam Greer November 14, 2007 Questions: 1. For the dog bone specimen, what did you observe happening to the blocks along the length of the specimen? (Remember, use the plot when answering this question, but also describe what you see in terms of the average stress at each block. For the dog bone specimen I noticed the length of the blocks was increasing. This can be seen from the following graph: Avg Stress at 86lbs 0 5 10 15 20 25 30 35 40 45 0 2 4 6 8 10 12 14 Square Stress Series1 Figure 1: Graph 1 Figure 1 is the graph of the average stress on the specimen per square at 86 lbs. The graph show that the most stress was felt at the interior sections of the dog bone specimen. This means that the specimen is more susceptible to length deformation in the middle of the specimen. This is because of the shape of the dog bone specimen. The dog bone is thinner in the middle than it is at its ends. So if the specimen was simply a rectangular shape with constant width and height then the average stress would be about the same all over the specimen. It makes sense for the specimen to be more resistant to stress and deformation at the thicker ends because I know from personal experience that it is hard to deform a material lengthwise that is very wide. It is because the force is being exerted

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over a much larger area and this takes away from the effect that that force has on the specimen.
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Deformation of Materials Lab write-up - Deformation of...

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