FEM ConstraintForce: Difference between revisions

From FreeCAD Documentation
m (Change section to 'Usage')
mNo edit summary
 
(40 intermediate revisions by 7 users not shown)
Line 1: Line 1:
<languages/>
<languages/>
{{UnfinishedDocu}}
<translate>
<translate>

<!--T:7-->
<!--T:7-->
{{Docnav
{{Docnav|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_ConstraintPressure|Constraint pressure]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintTransform.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintPressure.png}}
|[[FEM_ConstraintSpring|Constraint spring]]
|[[FEM_ConstraintPressure|Constraint pressure]]
|[[FEM_Workbench|FEM]]
|IconL=FEM_ConstraintSpring.svg
|IconR=FEM_ConstraintPressure.svg
|IconC=Workbench_FEM.svg
}}


<!--T:1-->
<!--T:1-->
{{GuiCommand
{{GuiCommand|Name=FEM ConstraintForce|MenuLocation=Model → Mechanical Constraints → Constraint force||Workbenches=[[Fem Workbench|FEM]]|Shortcut=|SeeAlso=[[FEM_tutorial|FEM tutorial]]}}
|Name=FEM ConstraintForce

|MenuLocation=Model → Mechanical boundary conditions and loads → Force load

|Workbenches=[[FEM_Workbench|FEM]]
|SeeAlso=[[FEM_ConstraintPressure|FEM ConstraintPressure]]
}}


==Description== <!--T:2-->
==Description== <!--T:2-->


<!--T:4-->
<!--T:4-->
This command applies a force of given value [N] to selected target geometry.
Applies a force of a given value [N] to the selected geometry.


==Usage== <!--T:3-->
==Usage== <!--T:3-->


<!--T:5-->
<!--T:5-->
# There are several ways to invoke the command:
1) Applying a force in normal direction to a face
#* Press the {{Button|[[Image:FEM_ConstraintForce.svg|16px]] [[FEM ConstraintForce|Force load]]}} button
** In FEM workbench, click on [[File:Fem-constraint-force.svg|24px|Constraint Force]] or select {{KEY|Model}} → {{KEY|Mechanical Constraints}} → {{KEY|Constraint force}} to open Force Constraint properties dialog
#* Select the {{MenuCommand|Model → Mechanical boundary conditions and loads → [[Image:FEM ConstraintForce.svg|16px]] Force load}} option from the menu.
[[File:FEMForceConstraintProperties.PNG]]
# The Mesh object will be hidden automatically and reveal the original model. If the Mesh object is still visible, do one of the following to hide it:
** If you have Mesh displayed, you need to hide it (select the mesh object and press {{KEY|spacebar}} or right click and select {{KEY|Hide item}}) and show the original model.
#* Select the Mesh object in the [[Tree_view|Tree view]] and press {{KEY|spacebar}}.
** Click on a ''face'' to which a force should be applied. It will appear in the list of geometrical objects.
#* Right-click on the Mesh object in the [[Tree_view|Tree view]] and select {{MenuCommand|Hide selection}} from its context menu.
** Fill in {{KEY|Line load}} with a force value in [N] (attention: ''Not'' in [N/m])
# The {{MenuCommand|Analysis feature parameters}} dialog in the [[Task_panel|Task panel]] has also been opened.
[[File:ApplyingForceToFace.PNG]]
# Press the {{Button|Add}} button and select one or more of either ''faces'', ''edges'' or ''vertices'' in the [[3D_view|3D view]] to apply the force to. The selected items will appear in the list of geometrical objects.
** {{KEY|Direction}}: In a typical case, you'll click this field empty to apply a force in normal direction to the face. You can revert the direction of the force by clicking {{KEY|Reverse direction}}. In other cases, you need to pick a face or plane, which is in normal to the force direction (it could differ from the face, to which the force is being applied)
# Optionally press the {{Button|Remove}} button and deselect one or more of the selected items in the [[3D_view|3D view]]. The deselected items will be removed from the list of geometrical objects.
** Click {{KEY|Close}} to finish the dialog and create {{KEY|[[File:FEM_ConstraintForce.png|24px]] ConstraintForce}} object
# Optionally edit the {{MenuCommand|Load [N]}} value.
# Optionally select a face or an edge and press the {{Button|Direction}} button to change the force direction. In a typical case, you'll leave this field empty to apply the force in the normal direction.
# Optionally check the {{MenuCommand|Reverse direction}} checkbox to reverse the force direction.
# Click {{Button|OK}} to finish.


</translate>
[[File:FEM ConstraintForce example.JPG]]
<translate>


<!--T:6-->
==Notes== <!--T:11-->
2) Applying a force in to line in selected direction
** In FEM workbench, click on [[File:FEM_ConstraintForce.png|24px|Constraint Force]] or select {{KEY|Model}} → {{KEY|Mechanical Constraints}} → {{KEY|Constraint force}} to open Force Constraint properties dialog
** If you have Mesh displayed, you need to hide it (select the mesh object and press {{KEY|spacebar}} or right click and select {{KEY|Hide item}}) and show the original model.
** Click on a ''line segment'' to which a force should be applied. It will appear in the list of geometrical objects.
** Fill in {{KEY|Area load}} with a force value in [N]
** {{KEY|Direction}}: Now, with line segment selected, it si likely that the force is applied in a wrong direction. We need to specify the direction by clicking the button {{KEY|Direction}} and then clicking a face pointing with its normal to the direction of the force (or reversed direction). Again, you can revert the direction of the force by clicking {{KEY|Reverse direction}}.
[[File:FEMforceonline.PNG]]
** Click {{KEY|Close}} to finish the dialog and create {{KEY|[[File:FEM_ConstraintForce.png|24px]] ConstraintForce}} object


⚫
<!--T:12-->
* The defined force is applied uniformly to the selected objects. For example, if you define one force load with 200 N applied to two faces having the same area, each face will be uniformly loaded with 100 N.
* This feature uses the [https://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node172.html *CLOAD card in CalculiX].


⚫
<!--T:8-->
{{Docnav|[[FEM_ConstraintTransform|Constraint transform]]|[[FEM_ConstraintPressure|Constraint pressure]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintTransform.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintPressure.png}}


<!--T:9-->
<!--T:8-->
{{Docnav
⚫
{{FEM Tools navi}}
|[[FEM_ConstraintSpring|Constraint spring]]
|[[FEM_ConstraintPressure|Constraint pressure]]
|[[FEM_Workbench|FEM]]
|IconL=FEM_ConstraintSpring.svg
|IconR=FEM_ConstraintPressure.svg
|IconC=Workbench_FEM.svg
}}


<!--T:10-->
⚫
{{Userdocnavi}}
</translate>
</translate>
⚫
{{FEM Tools navi{{#translation:}}}}
{{clear}}
⚫
{{Userdocnavi{{#translation:}}}}

Latest revision as of 08:47, 27 January 2024

Other languages:

FEM ConstraintForce

Menu location
Model → Mechanical boundary conditions and loads → Force load
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
FEM ConstraintPressure

Description

Applies a force of a given value [N] to the selected geometry.

Usage

  1. There are several ways to invoke the command:
    • Press the Force load button
    • Select the Model → Mechanical boundary conditions and loads → Force load option from the menu.
  2. The Mesh object will be hidden automatically and reveal the original model. If the Mesh object is still visible, do one of the following to hide it:
    • Select the Mesh object in the Tree view and press spacebar.
    • Right-click on the Mesh object in the Tree view and select Hide selection from its context menu.
  3. The Analysis feature parameters dialog in the Task panel has also been opened.
  4. Press the Add button and select one or more of either faces, edges or vertices in the 3D view to apply the force to. The selected items will appear in the list of geometrical objects.
  5. Optionally press the Remove button and deselect one or more of the selected items in the 3D view. The deselected items will be removed from the list of geometrical objects.
  6. Optionally edit the Load [N] value.
  7. Optionally select a face or an edge and press the Direction button to change the force direction. In a typical case, you'll leave this field empty to apply the force in the normal direction.
  8. Optionally check the Reverse direction checkbox to reverse the force direction.
  9. Click OK to finish.

Notes

  • The defined force is applied uniformly to the selected objects. For example, if you define one force load with 200 N applied to two faces having the same area, each face will be uniformly loaded with 100 N.
  • This feature uses the *CLOAD card in CalculiX.


FEM

Constraints

User documentation
Retrieved from "http://wiki.freecad.org/index.php?title=FEM_ConstraintForce&oldid=1358927"