Tensile Testing: Stress-Strain Graphs

Question 1

What goes on the y-axis on the graph?

Answer 1

stress (N/mm²)

Question 2

What goes on the x-axis on the graph?

Answer 2

Strain (x1000)

Question 3

How do you calculate the youngs modulus?

Answer 3

stress/strain

Question 4

How do you calculate the U.T.S?

Answer 4

The highest point on the stress-strain graph is the ultimate strength.

Question 5

What does a ductile material’s stress-strain graph look like?
Give an example of a ductile material.

Answer 5

It is a low and long curve.

An example is copper or aluminium.

Question 6

What does a tough material’s stress-strain graph look like?

Give an example of a tough material.

Answer 6

It is straight-up until the end of the elastic region where it dips slightly but rises slowly again in the plastic region until its necking points where it begins to slowly decrease again until it fractures.
An example is Mild/low-carbon steel

Question 7

What does a brittle material’s stress-strain graph look like?
Give an example of a brittle material.

Answer 7

The line increases in a straight line until the elastic region ends. It ends here as the material fractures.
An example is brass or cast iron