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Q9. A composite component consists of steel rod, which is 250 mm long with diameter of 35 mm, which is firmly attached to an aluminium rod 625 mm in length as shown in Fig Q9. When the component has tensile load of 32 kN applied to it the extension of the steel and aluminium section are identical.

Calculate EACH of the following:

(a) The diameter of the aluminium rod. (8)

(b) The stress in each section of the component. (4)

(c) The total extension of the component. (4)

Note:

Modules of elasticity for steel = 200 GN/m².

Modules of elasticity for aluminium = GN/m².