After you run the static study, you define a Fatigue Check plot to identify regions of the model that can possibly fail due to
repeated loading and unloading.
-
Right-click Results
and click Define
Fatigue Check Plot.
-
In the PropertyManager, under Modifying
Factors:
- Click On/Off Loading
. This option applies
zero-based loading to determine the mean and alternating stress.
- In Surface Finish Factor,
select Machined.
A
surface finish correction allows the estimate of the fatigue strength of the part in
its working condition.
- In Loading Factor, select
Axial.
Fatigue limits
are usually determined from test specimens under bending. A specimen loaded in
tension has a lower fatigue limit.
- For Size Factor, type
0.80.
Based on
experimental results, larger parts have lower fatigue limits than smaller parts. The
range is from 0.1 to 1.
Simulation considers the material's fatigue strength as half the
material's tensile strength. The cumulative factor is equal to the product of the three
reduction factors and reduces the material's fatigue strength by 0.686.
Simulation runs the fatigue check plot calculations. A yellow icon
indicates that parts of the model
could fail due to cycling loading.
Blue regions indicate that the stress levels are so low that fatigue
should not be a concern with the specified loading. Red regions indicate that the
specified loading will consume a percentage of the assembly's life. Red regions cover a
very small area of the parts.
-
To increase the minimum acceptable factor of safety for the material's
fatigue strength, for Minimum safety factor type
1.50 and press Enter.
Simulation divides the fatigue strength by the given factor and
updates the color of the parts in the graphics area. Notice that the red regions slightly
expand because the fatigue strength is
reduced.
To increase the material's fatigue strength (equals half
the material's tensile strength), for Scale this
value, enter a value greater than 1. The red regions contract.
-
Click
.