Stress Strain Curves - Ductility and Yield Stress of the Annealed Specimen - Engineering Assignment Help

Assignment Task :

Part 1: Answer all the following questions:
Question 1 
(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.
(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 
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
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
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?

Part 2: Design project:

Question 1

Identify and eliminate materials that do not meet the design criteria for each member. Take into account the mode of failure as well as non-zero ductility in your process. Show all working and briefly outline your methodology.

Question 2
Design an appropriate member (for both AB and AC) using the top three materials, choosing an appropriate cross-sectional shape and dimensions, and justify all your
results with calculations or discussion.

Question 3
Apart from cost and mass, name 4 additional considerations that might be important in choosing materials for the bridge. Provide a short explanation for each of your
responses.

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