- #1

DuncanBain

- 2

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I have a Force vs. Elongation graph of a specimen (Aluminium). From this I need to derive the values of Young's Modulus, Yield Stress, Yield Strain, Ultimate Tensile Strength and so forth.

I assumed this was fairly straight forward, but when I tried calculating the UTS, my answer was way way off of what it should roughly be.

The calculation I tried is as follows:

The maxima of the curve was 53.5kN and the A

_{0}of the specimen was 76.9mm

^{2}.

UTS = F/A

_{0}= 53500 / 76.9x10

^{-6}= 695.7MPa

The answer should be around the 69GPa mark.

Any ideas where I'm going wrong? I get similar results when trying to calculate any other values from the graph.

Many thanks.