The Add Event (Constant) PropertyManager allows you to define a constant amplitude fatigue event for a fatigue study. You can define multiple constant fatigue events for a study. A fatigue event refers to one or more static studies.
No. of Cycles
. Sets the number of cycles associated with this event.
Loading Type
. Sets the type of fatigue loading to determine the
stress peaks and hence the alternating stress. Alternating stress = |maximum
stress - minimum stress|/2, where | | denotes the absolute value.
Fully reversed (LR = -1). The fatigue event is based on one reference static study. All the loads, and hence stress components, in the reference study reverse their directions simultaneously for the specified number of cycles in the event.
Zero-based (LR = 0). The fatigue event is based on one reference static study. All loads, and hence stress components, in the reference study change their magnitudes proportionally from their maximum values as specified by the static study to zero.
Loading ratio. The fatigue event is based on one reference static study. Each load, and hence each stress component, in the reference study changes its magnitude proportionally from its maximum value (Smax) to a minimum value defined by R*Smax , where R is the load ratio. A negative ratio indicates reversal of the load direction.
Loading
ratio 
. Enter a loading ratio.
Fatigue loads
are said to be proportional
when the directions of principal stresses for each node are identical
for all the reference static studies that you use in defining fatigue
events. In all other cases, the fatigue loads are said to be non-proportional.
Find cycle peaks. The fatigue event is based on multiple reference static studies. The program uses the stress results of the specified studies to find cycle peaks that give the highest alternating stress for each node.
Study
Association 
. Sets the reference static studies.
No. Study counter. You can specify more than one study only if you select Find cycle peaks.
Study. Sets the reference static study. Click in this cell to select a study from the drop-down menu.
The list of
studies includes the studies that are associated with the currently active
configuration only.
Scale. This scale factor lets you define a fatigue event based on a reference study with scaled loads. Since the study is linear, the program uses this factor to scale the stresses.
For example, if the reference study has a pressure load of 50 psi applied to a face and you want to define a fatigue load based on 150 psi on the same face, you should enter a scale factor of 150/50 = 3. The program multiplies the stress results of the reference study by this factor to calculate stress values for use in calculating alternating stresses.
If you select Find cycle peaks, you can continue to define more rows. Double-click in the No. cell to add a row. All studies must have the same mesh.
You can use
the same study for defining multiple fatigue events.
To change the fatigue event type...
To define a fatigue event based on one reference study...
To define a fatigue event based on multiple reference studies...
