Use the Stress Based node to define the fatigue model selection and parameters for stress based fatigue evaluation. The Stress Based feature can be applied to domains, boundaries, edges, or points.

See Common Physics Interface and Feature Settings and Nodes for information about the Model Input.

From the Physics interface list select the physics interface where the load cycle is simulated.

If you select a Shell interface, also select a Through-thickness location — From physics interface, Top, or Bottom. This determines from which position in the shell stresses or strains are taken for fatigue evaluation. When you select From physics interface, the local z-coordinate given in the Default Through-thickness Result Location section in the settings for the Shell interface is used.

Select a Criterion — Findley, Matake, Normal stress, or Dang Van. This specifies the fatigue model to be evaluated. See Findley Criterion, Matake Criterion, Maximum Normal Stress Criterion, and Dang Van Criterion for details about these models.

If Findley or Matake is selected as the Criterion, select Evaluation method — Limit factor or Finite life. For Limit factor, the Normal stress sensitivity coefficient k and the Limit factor f. Both take their default values From material. For User defined, enter values or expressions as needed. For Finite life, under Basquin parameters, specify the Shear fatigue strength coefficient, τf', and the Shear fatigue strength exponent bγ. Both take their default values From material. For User defined, enter values or expressions as needed.

If Normal stress is selected as the Criterion, specify the Limit factor f. By default, it takes its value From material. For User defined, enter a value or an expression as needed.

If Dang Van is selected as the Criterion, the Hydrostatic stress sensitivity coefficient αDV and the Limit factor βDV take values From material. For User defined enter values or expressions in the fields as needed.

This section is visible if you have selected Findley, Matake, or Normal stress as Criterion. Under Critical plane settings, enter a Search resolution Q. The default is 11. This parameter determines the number of evaluation points used in the search for the critical plane, and it strongly affects the overall computational time.

If Findley or Matake is selected as the Criterion, also select a method for the Shear range search method — Circumscribing circle or Maximum distance.

If Findley or Matake is selected as the Criterion, and the Evaluation method is Finite life, specify the Cycle cutoff Ncut under Finite life settings.