Apply Local Fatigue Solution Settings
Apply fatigue solution settings to a group of parts in the assembly.
 In the Project Tree for the fatigue subcase, rightclick Solution settings and choose Edit.

Click New.
A new group appears in the group list.

In the modeling window, select one or more parts/spot
welds for the group.
Tip: You can also select parts/spot welds from the Project Tree.
 Optional: You can choose Exclude all to exclude all parts/spot welds in the assembly.
 Optional: You can select the Include all seam welds check box to include all seam welds in the assembly.

Under the General tab in the dialog, choose from the following options:
Option Procedure Fatigue Method The following methods are available:  Uniaxial
 Multiaxial
SN Model Settings  Stress Combination
 The following stress combination models are available only
under uniaxial fatigue method:
 Critical plane
 Absolute max principal
 Maximum principal
 Signed von Mises
 Signed max shear
 Tension Damage Model
 The following tension damage models are available:
 Goodman
 FKM  mean stress sensitivity input is required
 Shear Damage Model
 The Findley model is available for shear damage model under multiaxial fatigue method only. Findley constant and shear fatigue strength coefficient are required.
EN Model Settings  Stress Combination
 The following stress combinations are available only under
uniaxial fatigue method:
 Critical plane
 Absolute max principal
 Maximum principal
 Signed von Mises
 Signed max shear
 Tension Damage Model
 The following tension damage models are available:
 Smith, Watson, and Topper
 Morrow
 Shear Damage Model

The following shear damage models are available only under multiaxial fatigue method:
 FatemiSocie
 BrownMiller
Endurance limit modifying factors  Select Surface condition.
The following options are available: polish, ground, machine, hotroll, forge.
 Select surface treatment.
The following options are available: Nitrided, shotpeen, coldroll.
 Select fatigue strength reduction factor.
Number of planes Enter the number of critical planes. 
Under the Spot weld tab in the dialog, choose from the following options:
Option Procedure Model method Rupp fatigue analysis method is available. Mean stress correction FKM model is available. Mean stress sensitivity input is required.
Thickness correction Thickness effect consideration. Thickness reference and thickness reference exponent inputs are required.
TREF is used to define the reference thickness for thickness effect consideration. If the thickness of a shell (T) is greater than the specified value (TREF), the thickness effect is included by increasing the stress ( ${\sigma}_{ij}$ ) when thickness correction is applied:(1) $${\sigma}_{\mathit{ij}}={\sigma}_{\mathit{ij}}{\left(\frac{T}{\mathit{TREF}}\right)}^{\mathit{TREF}\_N}$$Default thickness reference = 25mm
Default reference exponent = 0.2
Endurance limit modifying factors Certainty of survival. Enter a value based on the scatter of the SN curve.
Default = 0.5
Number of angles Specify the number of angles to examine on sheet and nugget. Default = 20
 Click OK.