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Q7. The two side walls of a boiler are supported by solid bar stays to prevent excessive movement. Each stay is 50 mm diameter, 10 m long and supports a wall area of 0.5 m². The boiler internal pressure is 6 bar.

Calculate EACH of the following:

(a) the stress in the stay. (4)

(b) the strain energy in the stay. (4)

(c) the strain energy in a hollow stay of the same length and external diameter but with an internal diameter of 20 mm. (8)

Note: Modulus of Elasticity of stay material= 190 GN/m²