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MATERIALS TESTING, SELECTION AND DESIGN

Question 1 (5 marks)
(a) Present the engineering stress-strain curves obtained by tensile testing the asrolled and annealed aluminium specimens. These should be presented together on a
single graph.
Hint: if using Excel, be sure to select a “XY scatter” rather than a “line” graph, as in
some cases a “line” graph does not correctly plot the x values.
(b) Using appropriate equations to transform your data, add plots of True Stress vs
True Strain for both your samples to your graph from part (a). Make sure that you
only plot the region where these equations are valid. For any other region, indicate
approximately where you would expect the curve to lie (this part should be drawn
over the original graph).
Question 2 (10 marks)
By generating a line of best fit for the elastic region of the graphs, determine the
elastic modulus of the as-rolled and annealed aluminium samples that were tested.
On an atomic scale, what determines the modulus of a material? According to theory
would you expect the modulus of the annealed sample to be higher, lower or the
same as the as-rolled aluminium? Do your measurements match up with this
prediction? Explain your answers.
Question 3 (4 marks)
Using the engineering stress-strain curve that you obtained by tensile testing the
annealed aluminium specimen, determine the 0.2% proof stress, ultimate tensile
strength, uniform elongation and ductility for the material. Show how you found these
values on a new graph.
Question 4 (9 marks)
The yield stress, Young’s modulus, UTS and ductility (elongation) for Aluminium 1050
H19 and Aluminium 1050 O can be found in Table 1. These correspond to fully workhardened and annealed aluminium respectively.
Table 1: Literature values for Al 1050 H19 and Al 1050 O (CES Edupack database)
Grade E (GPa) σy (MPa) UTS (MPa) Ductility (%)
H19 70.5 165 175 3
O 70.5 35 80 38
MCD4270: Material Project Page 3
Prepare tables that compare the yield stress, UTS and ductility of your cold rolled
sample with Al1050 H19. Discuss the similarities and differences between the
theoretical values and the ones you measured. Repeat for your annealed sample
compared with Al1050 O. Discuss what this might imply about the amount of work
hardening in the specimens that you tested.
Question 5 (12 marks)

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  • Qualitatively, describe how the ductility and yield stress of the annealed
    specimen compare to the as-rolled specimen.
  • What is a dislocation?
  • How can dislocations be introduced into a metal?
  • What effect do dislocations have on material behaviour in the elastic region?
  • What effect do dislocations have on material behaviour in the plastic region?
  • Why does the number of dislocations change a material’s properties?

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