Fatigue Life Calculator (S-N Curve)

This calculator is designed for mechanical engineers to estimate the fatigue life of materials using the S-N curve. It helps in predicting the lifespan of components under cyclic loading conditions.

Calculator

Stress Amplitude (MPa) *

Cycles to Failure *

Results

Estimated Fatigue Life 0 cycles

Data Source and Methodology

All calculations are based on the S-N curve methodology as outlined in the Fatigue Design Handbook.

The Formula Explained

S-N Curve: \( N = \left( \frac{\sigma_a}{\sigma_e} \right)^b \)

Glossary of Terms

Stress Amplitude (\(\sigma_a\)): The stress level at each cycle.
Cycles to Failure (N): Number of cycles material can withstand before failure.

How It Works: A Step-by-Step Example

For a stress amplitude of 150 MPa, the estimated fatigue life is 10,000 cycles using the S-N curve method.

Frequently Asked Questions (FAQ)

What is fatigue life?

Fatigue life is the number of cycles a material can endure before failure.

How is the S-N curve used?

The S-N curve is used to predict the number of cycles to failure for a given stress level.

Tool developed by Ugo Candido.
Content reviewed by the Engineering Expert Team.
Last reviewed for accuracy on: October 1, 2023.

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