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Q10. A cast iron cylinder cover is secured by twelve steel bolts, each of 18 mm diameter. The effective cross sectional area of the cylinder cover is 0.15 m². On assembly, the bolts are tightened up so that the tensile stress in each bolt is 20 MN/m². The resulting stress in the cylinder cover is evenly distributed across its effective area.

Calculate the temperature rise at which the stress in the bolts will be zero.

Note: For Cast Iron modulus of Elasticity = 100 GN/m²

For Steel modulus of Elasticity = 200 GN/m²

For Cast Iron coefficient of linear expansion = 11 x 10^-6 per °C

For Steel coefficient of linear expansion = 12 x 10^-6 per °C