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Fatigue Module

Fatigue Module

Elastoplastic low-cycle fatigue (LCF) analysis of a cylinder with a hole. The last of three load cycles is used for the fatigue analysis to make sure that the state is representative of repeated loadings. Three different fatigue models are compared in this tutoria

Performing structural fatigue life computations in the COMSOL Multiphysics environment is done with the Fatigue Module. Available as an add-on to the Structural Mechanics Module, both high-cycle and low-cycle fatigue methods are available. For high-cycle, or stress-based fatigue, the Fatigue Module provides Findley, Matake, and Normal stress methods.

The Fatigue Module features the Smith-Watson-Topper, Wang-Brown, and Fatemi-Socie methods for low-cycle, or strain-based fatigue. Neuber's rule and the Hoffmann-Seeger method are available for quick and approximate elastoplastic material fatigue computations. Yet, it is also possible to consider full elastoplastic fatigue evaluations when combining the Fatigue Module with the Nonlinear Structural Materials Module.

Postprocessing results from the Fatigue Module include visualization of fatigue life based on the number of cycles until failure, as well as calculation of the fatigue usage factor.

 

Application Area

  • Stress-based fatigue
  • Strain-based fatigue
  • High-cycle fatigue
  • Low-cycle fatigue
  • Findley method
  • Matake method
  • Normal-stress method
  • Fatemi-Socie method
  • Smith-Watson-Topper (SWT) method
  • Wang-Brown method with Morrow mean-stress correction

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