1. (a) Draw two Engineering Stress - Engineering Strain graphs: one for a ductile metal and one for a brittle metal, mar

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1 A Draw Two Engineering Stress Engineering Strain Graphs One For A Ductile Metal And One For A Brittle Metal Mar 1 (63.44 KiB) Viewed 33 times

1. (a) Draw two Engineering Stress - Engineering Strain graphs: one for a ductile metal and one for a brittle metal, marking and labelling on both graphs the Yield Stress, the Ultimate Tensile Stress, the Fracture Stress, the region in which necking occurs. Correctly label all graph axes and give correct units. (8 Marks) (b) A cylindrical rod made from an unknown metal is 350mm long and has a diameter of 10mm. The rod is subjected to a tensile load. It experiences only elastic deformation and elongates by less than 1.0mm under an applied load of 19,800N. Could any of the four metals listed in the table below could be the unknown metal? If so which ones and why? Material Modulus of Yield Ultimate Elasticity / Strength / Tensile GPa MPa Strength / MPa Aluminium 70 255 420 alloy Brass 100 345 420 Copper alloy 110 250 290 Steel 207 450 550 (9 Marks) (c) Sketch a diagram showing impact energy as a function of temperature, of (1) 0.1% carbon steel: (ii) 1.0% carbon steel. Give the name of the observed phenomenon and explain how the behaviour would be expected to be different for boc and fos alloys. (8 Marks) Total (25 Marks)