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Durability > Durability theory > Biaxial fatigue evaluation on element free faces

Biaxial fatigue evaluation for beam elements

The durability solver lets you evaluate life and damage for a beam element using the biaxial approach NOTE. The solver determines the maximum principal stress, σmax, and minimum principal stress, σmin, of the beam using the following equations:

where σaxi is the axial normal stress of the beam and τtor is the torsional shear stress of the beam.

The stress biaxial ratio of the beam, rbeam, is calculated as follows:

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Biaxial fatigue evaluation on element free faces

Von Mises effective amplitude approach

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Stress biaxial ratio

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Biaxial fatigue evaluation for beam elements, Simcenter 3D 2021.1 Series

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Matsuishi, M., and Endo, T., “Fatigue of Metals Subjected to Varying Stress”, Japan Society of Mechanical Engineers, March, 1968.

Endo, T., et. al., “Damage Evaluation of Metals for Random or Varying Loading”, Proceedings of the 1974 Symposium on Mechanical Behavior of Materials, Volume 1, Society of Materials Science, Japan, 1974. pp. 371-380.

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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id986787 · retrieved 2026-07-17