##  [S-N Curve](/s-n-curve) 

  ##  [S-N Curve](https://engineering.quantumdictionary.io/s-n-curve-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A plot that relates cyclic stress (usually stress amplitude or alternating stress S) to the number of cycles to failure (N) for a specific material and specimen geometry, produced from controlled fatigue tests and frequently displayed with logarithmic N; used to characterise fatigue life under constant‑amplitude cyclic loading conditions.