Question

In the S-N curve, "N" represents :

• A. Load cycles
• B. Number of cycles to failure
• C. Stress amplitude
• D. Time to failure

Hint:

The "N" value on an S-N curve is crucial in fatigue analysis to predict how long a material will last under cyclic loading conditions.

Answer 1

The Correct Option is B

In the S-N curve, "N" represents the number of cycles to failure, which indicates how many cycles of loading a material can withstand before it fails under a given stress amplitude. The S-N curve (also known as a Wöhler curve) plots the number of cycles (N) on the x-axis and the applied stress (S) on the y-axis.
- Load cycles refers to the total number of cycles, but the specific focus in the S-N curve is the number of cycles to failure.
- Stress amplitude is not directly represented by "N"; it is typically plotted on the y-axis.
- Time to failure is not explicitly shown on the S-N curve; instead, the number of cycles is considered.
Thus, the correct answer is (2), Number of cycles to failure.