Factor of Safety
To use Factor of Safety:
Run a static study.
In the Simulation study tree, right-click 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 Tsai-Hill 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).