Contents
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Description
This paper answers the following questions –
1/ Explain the fundamental reasons why ceramics are brittle and metals are tough.
2/ Explain why glass generally has low tensile strength and briefly describe two methods by which it can be ''strengthened''.
3/Explain, in terms of Griffith's equation, why steel is a ''safer'' engineering materials than glass.
4/ Explain the differences between elastic deformation, uniform plastic deformation and local plastic deformation (necking).
5/ Describe the mechanism of rubber elasticity, explaining how it leads to low stiffness and high extensions.
6/ Explain how the combination of thermosetting resin and glass fibres, both of which are brittle, gives composite materials which are tough.
