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ENGINEERING, CS 2022 HSC 20 MC

For a particular material, specimens of different sizes were tested. A load-extension diagram and a stress-strain diagram are to be drawn for each specimen.

The shape of which diagram(s) will be affected by the size of the specimen tested?

  1. Both diagrams
  2. Neither diagram
  3. The stress–strain diagram only
  4. The load–extension diagram only
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`D`

Show Worked Solution
  • The stress–strain diagrams will be the same shapes as both stress and strain are calculated by dividing by constants (original area and original length).

`=>D`


♦♦ Mean mark 36%.

ENGINEERING, CS 2021 HSC 12 MC

The stress–strain diagram shown is being used to calculate a material property.
 

What material property can be calculated by using the dotted lines shown in this diagram?

  1. Hardness
  2. Toughness
  3. Proof stress
  4. Ultimate tensile stress
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`C`

Show Worked Solution
  • Proof stress is obtained by drawing a parallel (dotted) line to the start of the graph from a starting point at 0.2% strain and measuring where it subsequently cuts the graph.

`=>C`


♦♦ Mean mark 48%.