Two identical sized specimens of materials A and B are made from materials which produce stress v strain graphs as shown below.
Please see attached file
1. (a) State the four classes of engineering materials
(b) Identify the class which each of the following materials belong to.
Present your answer in table form
Silicone, concrete, chromium,
3. A material which has a Young’s modulus of elasticity of 250 GN m–2 and
a poisons ratio of 0.32, calculate:
(a) the bulk modulus of the material
(b) the shear modulus of the material.
4. (a) Describe the methods of classifying polymeric materials.
(b) Distinguish between addition and condensation polymerisation and
give specific examples of polymers synthesised by each method.
5. (a) What are the two essential constituent elements of plain carbon steel?
(b) What is cementite ?
(c) State the values of hardness for ferrite and cementite. State your
answers in the units of Brinell hardness number. Give references for
the sources of your answers.
A B
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(d) How are the following properties of iron affected when carbon is
alloyed with it?
Illustrate your answer with reference to the microstructure of the
steel.
• hardness
• strength
• ductility.
(e) What percentage of carbon produces the strongest plain carbon steel?
6. The ultimate tensile strength of a material was tested using 10 samples.
The results of the tests were as follows :
711 N mm–2, 732 N mm–2, 759 N mm–2, 670 N mm–2, 701 N mm–2,
765 N mm–2, 743 N mm–2, 755 N mm–2, 715 N mm–2, 713 N mm–2.
(a) Determine the mean and standard deviation of these results.
(b) Express the values found in (a) in GPa.