The Factor of Safety Wizard allows you to assess the safety of your design based on a failure criterion.
After your run a static study, you can calculate the factor of safety of your model.
To access the Factor of Safety Wizard, do one of the following:
- After you run a static study, right-click Results and select Define Factor of Safety Plot.
- Click the down arrow on Results (Simulation CommandManager) and select New Plot, Factor of Safety.
Step 1 of 3
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All |
Selects all bodies to plot the factor of safety. |
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Selected bodies |
Select a single or multiple bodies from the menu to plot the factor of safety. |
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Criterion |
Select one of the following failure criterion:
Maximum von Mises stress
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Maximum shear stress (Tresca)
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Mohr-Coulomb stress
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Maximum Normal stress
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Automatic
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Composite Options ( Available for models with composite shells only)
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Tsai-Hill Criterion
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Tsai-Wu Criterion
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Maximum Stress Criterion
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When you select Automatic, the software selects the most appropriate failure criterion across all element types. The software applies the following conditions:
- The default Failure Criterion assigned in the Material dialog box for each material.
- If you have not assigned a default failure criterion in the Material dialog box, the software assigns the Mohr-Coulomb stress criterion.
- If you selected Max von Mises or Max shear (Tresca) criterion for a beam material, the software uses the yield strength as allowable stress.
- If you selected Max normal or Mohr-Coulomb criterion for a beam material, the software uses the tensile strength as the allowable stress.
- For composite shells, the Tsai-Hill failure criterion is applied when Automatic is selected.
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What does this mean |
Displays the mathematical relation that described the selected failure criterion.
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Property
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Include title text |
Lets you type a custom title for the plot. |
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Associate plot with name view orientation |
Associates a predefined view orientation with the active plot.
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Next |
Goes to the next step.
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Step 2 of 3
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Units |
Sets the stress units.
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Set stress limit |
to Yield strength
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Sets the stress limit to yield strength.
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to Ultimate strength
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Sets the stress limit to ultimate strength.
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to User defined
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Sets the stress limit to a user-specified value.
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If you selected Mohr-Coulomb stress criterion from the previous step, you must set the tensile and compressive stress limits.
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Multiplication factor |
Allows you to enter a multiplication factor for calculating the selected stress limit. For example, if you apply a factor of 0.5 to a yield strength stress limit of 2000 psi, Factor of Safety Wizard uses 0.5 x 2000 = 1000 psi for the stress limit.
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Beam Results
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Shell Results |
Select the shell face for which you want to perform the Factor of Safety:
Top
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Bottom
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Minimum
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Maximum
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Run two checks: one for the top face, and the other for the bottom face.
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Material involved |
Displays the material names and properties related to the stress limits used by Factor of Safety. |
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Composite Options
(Available for models with composite shells only.) |
Worst-case across all plies
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Envelope plot for minimum FOS across all plies (including top and bottom faces of every ply).
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Ply number
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Allows you to select the ply number for the factor of safety output. This option is not available when Worst-case across all plies is selected. You can select the top or bottom face for the selected ply number.
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Prev |
Returns to the previous step. |
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Next |
Goes to the next step. |
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Step 3 of 3
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Factor of safety distribution |
Plots the distribution of the factor of safety. |
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Areas below factor of safety |
Plots the regions below the specified factor of safety (displayed in red color). Regions above the specified factor of safety are displayed in blue color. |
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Safety result |
Lists the minimum factor of safety based on the selected criterion. |
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Prev |
Returns to the previous step. |