Results Postprocessing > Freebody Plots > 12.5 Create Loads or Boundary Conditions
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12.5 Create Loads or Boundary Conditions
This is the portion of the Freebody plot tool that saves the displayed data as load or boundary condition sets. It is not necessary to use this option unless you wish to create them from the Freebody, Interface, or Displacement plots.
Toggles the form to create loads and boundary conditions from freebody plots.
Creating loads and boundary conditions from freebody plot displays is a two step process. First a field is created for the appropriate type such as force, moment, or displacement. Then the fields are assigned to a Load Case. Only what is graphically displayed on the screen is actually created in the fields. The following table explains each option.
Attribute
Description
Create
Force/Moment
Displ/Rotational
Field
Create both a force and a moment field or one or the other (translational and rotational fields for forced displacements). What is displayed graphically is what is created in the new field. You must create at least one field in order to create a load set. Once fields are created you may use them as you would any other field. Then access them and modify or delete them from the Fields application. The fields are created in the coordinate system specified as the transformation coordinate on the main (Select Results) form, otherwise they will be written in the global system. For Interface loads, the display attribute “Display Nodal Contributions” must be on in order to create fields for this type of plot.
Assign Fields to LBC
Toggle ON to assign the fields to a new LBC set (load set). Then enter a name and assign it to a load case. Once a load set has been created you may access, modify, or delete it from the Loads/BCs application. The same naming convention is used here as is used when creating fields. If the Type is Interface Loads, then only this option is presented since only at a single node will force and moments be created. No fields will be created. Therefore, no fields are necessary.If you wish you may assign a new load case name and a new load case will be created. For Interface loads only the “Total Load” is assigned to the LBC, not the fields.
Overwrite / Increment
When multiple results are selected for display, multiple fields and LBC set names will be created. The names of the fields and LBC set names will be augmented by appending a version on the end of them if Increment is selected (e.g., Fbdy_Force.001, Fbdy_Force.002, etc.). You can overwrite or increment the names.
Field Name
The default name for a field is Fbdy_<type> where the type can be Force, Moment, Translation, or Rotation. Change it if desired.
LBC Name
The default LBC name is Fbdy_LBC or Fbdy_Disp_LBC. Change it if desired.
Load Case Assignment
When creating a new LBC you can select to which Load Case it is assigned from this listbox. The default is the Default load case.
Insert / Increment
This works similar to Overwrite/Increment with field names. For Load Case names however the option is to either insert the new LBC into the currently selected Load Case or to create a new Load Case with the name incremented with a version number (e.g., LBC.001,LBC.002, etc.).
LC Name
You can type in a new Load Case name here is you wish or select an existing one from the Load Case Assignment listbox.
Reset Plot
This will remove any freebody plot from the graphics screen.
Defaults
This will reset all widgets to their default values and will remove any plot.
Pressing Apply here will create the specified fields and load set for the currently displayed plot for access and assignment in a subsequent finite element analysis. Defaults will set the forms back to their default settings and Reset Plot will erase the vectors from the screen.
Some consideration to be aware of when creating fields and LBC sets.
• If a planar display is plotted of three dimensional data, then the appropriate column is zeroed in the field.
• The display attribute “Display Free Edges Only” can limit the amount of information that is placed in a field for Freebody and Displacement plots.
• The display attribute “Display Nodal Contributions” for Interface loads must be on in order to create fields. Only the “Total Load” will be written to the new LBC set, not the fields.
• The display attribute “Hide Results Near Zero” affects the amount of data written to the fields for Freebody Loads and Interface Loads but not Displacement. All displacement data is written no matter how small since all the data is necessary for a re-analysis. Zero displacement is a necessary boundary condition.
• Once a new LBC is created or an existing one is modified, you must make sure that the LBC is the current LBC in order to visualize the LBC markers on your model. This is done in the Loads/BCs application.