Factor of Safety
To use Factor of Safety:

Run a static study.

In the Simulation study tree, rightclick the Results folder and select Define Factor Of Safety Plot .
or
Click the down arrow on Results (Simulation CommandManager) and select New Plot, Factor Of Safety.
The Factor of Safety PropertyManager appears.

In Step 1 of 3:

Select All, a component or a body in Component.
When you select All, the stress limit of each component is considered. Factor of Safety skips components for which no stress limit is defined. Such components are grayed out in Factor of Safety plots.

Select a failure criterion in Criterion :
The What does this mean area shows the mathematical statement of the criterion.
NOTE: For composite shells, the TsaiHill failure criterion is applied when Automatic is selected.

Under Property:


Click .

In Step 2 of 3:

Under Set stress limit to, select one of the following options:


Yield strength. To set the limit stress to the yield strength of the material.

Ultimate strength. To set the limit stress to the ultimate strength of the material.

User defined. Type a value for the limit stress.

Under Multiplication factor, enter the factor to multiply the stress limit with. Default value is 1.0.
The Material involved box shows the material of the selected component and the associated yield and ultimate strengths.
The Max stress in the model box shows the maximum stress in the model.

Select stress Units.

Under Set tensile stress limit, select one of the following options:

Yield strength. To set the tensile stress limit to the yield strength of the material.

Ultimate strength. To set the tensile stress limit to the ultimate strength of the material.

User defined. Type a value for the tensile stress limit.

Under Multiplication factor, enter the factor to multiply the stress limit with. Default value is 1.0.

Under Set compressive stress limit, select one of the following options:

Ultimate strength. To set the compressive stress limit to ultimate strength of the material.


Under Multiplication factor, enter the factor to multiply the stress limit with. Default value is 1.0.
The Material involved box shows the material of the selected components, and the associated yield and ultimate strengths.
The Max stress in the model box shows the maximum normal stresses (1st and 2nd principal) in the model.


Click .

For Composite Options:

or
Select Ply numberand select Top or Bottom face for that ply number.

In Step 3 of 3, select:
The Safety result box shows the minimum factor of safety based on the selected criterion.

Click .
NOTES:

Areas of the FOS plot with values larger than 100 are shown with the color of the 100 value. If the maximum FOS value is less than 100, then the chart is scaled from the minimum to the maximum FOS value.

If you select to plot Areas below factor of safety, the software displays regions of the model with factors of safety less than the specified value in red (unsafe regions) and regions with higher factors of safety in blue (safe regions).