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Q8.  With reference to fatigue of engineering components;

(a) Draw an S/N curve for steel, showing the fatigue limit and two representative stress cycle condition on the graph (4)

(b) Explain how a component is designed to avoid fatigue failure, suing the S/N curve drawn in part (a) (4)

(c) Explain how poor maintenance and incorrect machinery operation can result in fatigue failure even though a component is designed to operate below the fatigue limit (8)