With reference to fatigue cracking: (a) describe, with the aid of an S/N curve, the relationship between applied stress and the number of applied stress fluctuations in fatigue crack propagation (5) (b) Define the term Stress Raiser, giving examples and explaining the influence of a stress raiser on the propagation of a fatigue crack (5) (c) Define the term Fatigue Limit, explaining, with examples, how poor maintenance and poor machine operation can result in fatigue crack propagation even though a component has been designed to avoid fatigue cracking (6)
Materials
UKM Tuticorin 
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