S N Curve Calculator


Calculating SN curve values is crucial in engineering for understanding material fatigue and durability. Developing a reliable SN curve calculator simplifies this process, enabling engineers to make informed decisions regarding material selection and structural design.

How to Use:

To utilize the SN curve calculator, input the required parameters into the designated fields. These parameters typically include stress level (S) and number of cycles to failure (N). Once the data is entered, click the “Calculate” button to obtain the desired result.


The SN curve calculation is based on the Basquin equation, which relates stress level (S) and number of cycles to failure (N) logarithmically:


  • N = Number of cycles to failure
  • S = Stress level
  • A and m = Material constants

Example Solve:

Thus, for a stress level of 100 MPa, the material is expected to withstand approximately 39810 cycles.


Q: What are SN curves used for?

A: SN curves are used to predict the fatigue life of materials subjected to cyclic loading, aiding in structural design and material selection processes.

Q: How are material constants determined for SN curve calculations?

A: Material constants (A and m) are typically determined through empirical testing and analysis of fatigue data for specific materials.

Q: Can SN curve calculations be applied to all materials?

A: SN curve calculations are commonly used for metallic materials but may not be directly applicable to other material types such as polymers or composites.


In conclusion, the SN curve calculator serves as a valuable tool for engineers and materials scientists in predicting material fatigue behavior. By understanding the relationship between stress level and number of cycles to failure, informed decisions can be made to ensure the reliability and durability of engineering components.

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