Perform uniaxial fatigue analysis using S-N (stress-life) and E-N (strain-life) approaches for predicting the life
(number of loading cycles) of a structure under cyclical loading.
Perform multiaxial fatigue analysis using S-N (stress-life), E-N (strain-life), and Dang Van Criterion (Factor of
Safety) approaches for predicting the life (number of loading cycles) of a structure under cyclical loading.
Perform multiaxial fatigue analysis using S-N (stress-life), E-N (strain-life), and Dang Van Criterion (Factor of
Safety) approaches for predicting the life (number of loading cycles) of a structure under cyclical loading.
From the Home tools, Files tool group, click the Open Model tool.
From the Load model and result dialog, browse and select
HL-1020\Ibeam.h3d for the model
file.
The Load Result field is
automatically populated. For this tutorial, the same file is used for both
the model and the result.
Click Apply.
Tip: Quickly import the model by dragging and
dropping the .h3d file from
a windows browser into the HyperLifemodeling window.
Define the Fatigue Module
Click the SN tool.
The SN tool should be the default fatigue module selected.
If it is not, click the arrow next to the fatigue module icon to display a
list of available options.
The SN dialog opens.
Define the SN configuration parameters.
Select Multi Axial as the method.
Select MPa for the FE model units.
Enter a value of 20 for the number of
planes.
Enter a value of 0.5 for the certainty of
survival.
Select GOODMAN for the Tension Damage
Model.
Select NONE for the Shear Damage Model.
Select Worst for the layer selection.
Select Time Series for the type of
loading.
Exit the dialog.
Assign Materials
Click the Material tool.
The Assign Material dialog opens.
Activate the checkboxes next to the parts Flange and
Web.
Create a new material.
Click the My Material tab.
Click to create a new material.
Name the material Mat_SN_multiaxial.
Set the Elastic modulus to 200000.
Set the Input method to
Slope-intcept,2-seg.
Accept all other default settings then click Plot &
Save.
Right-click on Mat_SN_multiaxial and select
Add to Assign Material List.
Return to the Assign Material Data tab and select
Mat_SN_multiaxial from the Material drop-down menu
for both Flange and Web.
The Material list is populated with the materials selected from Material
Database and My Material.
Exit the dialog.
Assign Load Histories
Click the Load Map tool.
The Load Map dialog opens.
From the Channel Type drop-down menu at the top of the dialog, select
Time Data.
Click in the Choose File
field and browse for load1.csv.
Click to add the load case.
Repeat steps 3 and 4 for
load2.csv, load3.csv, and
load4.csv.
Optional: Click to view a plot of the loads.
Tip: Expand the width of the dialog to view a clearer picture of the
plot.
On the bottom half of the dialog, set the radio button to
Auto for event creation.
Select both the load 1 (block1) and load 2
(block1) channels and Subcase 1 and
Subcase 2, then click to create the first event.
In a similar manner, create a second event by selecting load 3
(block1), and load 4 (block1),
Subcase 1, and Subcase
2.
Activate the checkboxes for the two events.
Set the Scale as shown in the image below.
Exit the dialog.
Evaluate and View Results
From the Evaluate tool group, click the
Run Analysis tool.
The Evaluate dialog opens.
Optional: Enter a name for the run.
Click Run.
Result files are saved to the home directory and the
Run Status dialog opens.
Once the run is complete, click View Current
Results.
Use the Results Explorer to
visualize various types of results.
The contour below highlights the total damage (Event 1 + Event 2).