IEC

Compute Random Response Fatigue with IEC-61373.

Random Response Fatigue is evaluated at each global direction for each element of the selected Parts.

The implementation process is shown in Figure 1.

(1)

D_{d i r e c t i o n} = \sum \frac{n}{N}

$D_{d i r e c t i o n} = \sum \frac{n}{N}$

$D_{d i r e c t i o n}$ $D_{d i r e c t i o n}$ = Total damage from 1 $σ$ $σ$ , 2 $σ$ $σ$ , and 3 $σ$ $σ$ in each direction.
$n$ $n$ = Total exposure time ( $n_{_{σ}}$ $n_{_{σ}}$ ).
$N$ $N$ = Fatigue Life (maximum number of cycles of a particular stress amplitude $σ$ $σ$ for the material prior to failure) from the Material SN curve.

Fatigue Material: SN materials for Parts/Components are created/selected from the Material context.; To assign materials to parts, right-click the material in the My Material tab and select Add to Assign Material List from the context menu. Navigate to the Assign Material Data tab, enable the desired part, and select the appropriate material in the Material column.; Both Slope-intcept,1-seg and Slope-intcept,2-seg are supported.
Query Report: Preferences > Save Rainflow Data can be used to query elements for viewing Report.

Restriction:

Table 1. Assign Material Parameters
Parameter	Description
Material	Material assigned to the part. Material list for selection is created by adding Materials to the Assign Material list from Material Db, My Material, or HM Material tabs.
Material Units	Unit of the assigned material.
Plot	Stress Life plot of the assigned material.
FL	Fatigue Limit of the assigned material.

Output

Cumulative Damage in XX, YY, and ZZ across all events and total across all three directions per layer.
Results per layer (TOP/BOTTOM):
- Computed RMS stress per direction for all events.
- Damage per direction for all events.
- Total exposure time $n_{1}_{σ}$ $n_{1}_{σ}$ for all events.
- Fatigue Life/cycles for 1 $σ$ $σ$ for all events.