a) Explain the difference between a material that has ductile behaviour and one that behaviour as each are placed under increasing tensile stress up to has brittle their breaking point.

b) In the table below material A is a mild steel, material B is a glass fibre. Sketch on the same set of axes, graphs of stress against strain to illustrate the difference in behaviour of materials A and B under tensile stress.

Fig: 1

Fig: 2

Fig: 3

Fig: 4