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Durability > Durability theory

Understanding the fatigue safety evaluation

You can evaluate fatigue safety to predict whether any part of the structure will ever fail in the design life due to cyclic loading in an event. The durability solver calculates the following fatigue safety result sets:

  • The fatigue safety factor (FSF)

  • The fatigue failure index (FFI)

To evaluate these results sets, the durability solver can use any of the following output methods:

  • Goodman output

  • Gerber output

  • Dang Van output

Note:

Dang Van output is not supported for orthotropic materials.

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Static events

Transient events

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Goodman and Gerber methods

Computation of the maximum alternating stress

Dang Van fatigue safety factor

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Understanding the fatigue safety evaluation, Simcenter 3D 2021.1 Series

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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id624886 · retrieved 2026-07-17