Question

Figure shows stress/strain curves for three different materials taken to ‘fracture’.Which curve best shows the behaviour of a copper wire, and which one best shows the behaviour of a ‘glass fibre’?

	(a)	(b)	(c)	(d)
Copper wire	I	II	III	II
Glass fibre	II	III	III	I

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (D)

Glass is brittle, so the strain produced at fracture is very less. Copper is ductile, hence there is a considerable length after the elastic limit before the fracture point.