Vida em Fadiga (aprox)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
S-N
About this calculator
The Life in Fatigue (Approx) Calculator is a useful tool for mechanical engineers and industry professionals who need to estimate the useful life of materials under cyclic loading. The formula used is the S-N curve, represented by N = A/σᵇ, where N is the useful life, A is the constant, σ is the stress and b is the exponent.
This calculator is specific to materials subjected to cyclic loading and is particularly useful in applications such as aeronautics, automotive and heavy equipment construction. Additionally, it is essential to consider common precautions when using this formula, such as the accuracy of input data and the selection of the correct exponent b.
Life in fatigue is a fundamental concept in mechanical engineering and is crucial to ensure the safety and reliability of equipment and structures. Using this calculator can help prevent failures and accidents, ensuring that materials are subjected to stresses within their resistance limits.
Please note that this is an approximate life in fatigue calculator and results should be confirmed with experimental tests or more detailed analyses.
Frequently asked questions
What is the S-N curve?
The S-N curve is a graphical representation of the relationship between cyclic stress and the useful life of a material. It is used to estimate the resistance of materials to cyclic loading.
When to use this calculator?
This calculator should be used to estimate the useful life of materials subjected to cyclic loading in applications such as aeronautics, automotive and heavy equipment construction.
What is the exponent b?
The exponent b is a parameter that represents the relationship between cyclic stress and the useful life of a material. It must be chosen based on experimental data or more detailed analyses.
Why is the accuracy of input data important?
The accuracy of input data is crucial to ensure that the calculator results are reliable and accurate. Inaccurate data can lead to incorrect and potentially hazardous results.
What to do with the calculator results?
The calculator results should be confirmed with experimental tests or more detailed analyses to ensure the safety and reliability of materials and structures.