This question was previously asked in

UPRVUNL AE ME 2016 Official Paper

Option 1 : Fatigue strength (on y-axis) and numbers of fully reversed stress cycle (on x-axis)

ST 1: General Awareness

6945

15 Questions
15 Marks
15 Mins

The common form of presentation of fatigue data is by using the S-N curve, where the total cyclic stress (S) is plotted against the number of cycles to failure (N) in a logarithmic scale.

the fatigue life reduces with respect to the increase in stress range and at a limiting value of stress, the curve flattens off. The point at which the S-N curve flattens off is called the ‘endurance limit’.

The line between 103 and 106 cycles is taken to represent high cycle fatigue.

From the S-N curve, we can see that the curve becomes asymptotic nearly at 106 cycles.