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Question: question 4 three specimens labelled a b and c are...

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Question 4 Three specimens labelled A, B and C are manufactured identically from a non-ferrous allov. The table below lists the conditions of the fatigue test. Specimen ơmax (MPa) Omin (MPa) +370 +310 +440 -290 -310 360 (a) Which of these specimens would you expect to have the longest and the shortest fatigue lifetimes? Discuss your answer [6 marks] (b) Sketch the S-N curves for these three specimens. [6 marks] (c) Discuss factors that will affect the fatigue life and how to extend this life? [6 marks] (d) Explain the stages of fatigue failure and the main characteristics of fatigue fracture surface.,

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