FEM ConstraintSelfWeight: Difference between revisions
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{{Docnav |
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|[[FEM_ConstraintCentrif|Constraint centrif]] |
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|[[FEM_ConstraintInitialTemperature|Constraint initial temperature]] |
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|[[FEM_Workbench|FEM]] |
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|IconL=FEM_ConstraintCentrif.svg |
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{{GuiCommand |
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{{GuiCommand|Name=FEM ConstraintSelfWeight|MenuLocation=FEM → Constraint self weight||Workbenches=[[Fem Workbench|FEM]]|Shortcut=C,W|SeeAlso=[[FEM_tutorial|FEM tutorial]]}} |
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|Name=FEM ConstraintSelfWeight |
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|MenuLocation=Model → Mechanical boundary conditions and loads → Gravity load |
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|Workbenches=[[FEM_Workbench|FEM]] |
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|SeeAlso=[[FEM_tutorial|FEM tutorial]] |
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}} |
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==Description== <!--T:2--> |
==Description== <!--T:2--> |
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#Click on [[Image:FEM ConstraintSelfWeight.png|32px]] or choose {{KEY| FEM}} → {{KEY|[[Image:FEM ConstraintSelfWeight.png|32px]] Constraint self weight}} from the top menu or press {{KEY|C}} then {{KEY|W}} keys. |
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#You can modify the direction of gravitation by changing its vector coordinates in the property bar of newly created ConstraintSelfWeight object. |
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{{VersionMinus|0.21}}: The acceleration has a fixed value of 9.81 m/s^2. |
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# There are several ways to invoke the command: |
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#* Press the {{Button|[[Image:FEM_ConstraintSelfWeight.svg|16px]] [[FEM_ConstraintSelfWeight|Gravity load]]}} button. |
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#* Select the {{MenuCommand|Model → Mechanical boundary conditions and loads → [[Image:FEM_ConstraintSelfWeight.svg|16px]] Gravity load}} option from the menu. |
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# A ConstraintSelfWeight object is created. |
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# {{Version|1.0}}: Optionally change its {{PropertyData|Gravity Acceleration}} property. |
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# Optionally change its {{PropertyData|Gravity Direction}} property. |
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==Scripting== <!--T:4--> |
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{{Code|code= |
{{Code|code= |
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import ObjectsFem |
import ObjectsFem |
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ObjectsFem.makeConstraintSelfWeight( |
ObjectsFem.makeConstraintSelfWeight(name) |
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}} |
}} |
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Add object to the analysis named Analysis: |
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{{Code|code= |
{{Code|code= |
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App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [ |
App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [(object)] |
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}} |
}} |
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* example: |
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Example: |
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{{Code|code= |
{{Code|code= |
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import ObjectsFem |
import ObjectsFem |
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selfweight_obj = ObjectsFem.makeConstraintSelfWeight( |
selfweight_obj = ObjectsFem.makeConstraintSelfWeight("MySelfWeightObject") |
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App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [selfweight_obj] |
App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [selfweight_obj] |
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}} |
}} |
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== Solver CalculiX == |
== Solver CalculiX == <!--T:18--> |
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===Limitations=== <!--T:19--> |
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Example of lines in .inp file: |
Example of lines in the .inp file: |
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{{Code|code= |
{{Code|code= |
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*DLOAD |
*DLOAD |
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Eall,GRAV,9810,0.0,0.0,-1.0 |
Eall,GRAV,9810,0.0,0.0,-1.0 |
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}} |
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where 9810 is gravity acceleration in [mm/s^2] |
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where 9810 is a gravity acceleration magnitude in [mm/s^2], and 0,0,-1 is the direction vector. The value can be set as a multiple of standard gravity acceleration to simulate loading of e.g. 4g. |
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{{Docnav |
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|[[FEM_ConstraintCentrif|Constraint centrif]] |
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|[[FEM_ConstraintInitialTemperature|Constraint initial temperature]] |
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|[[FEM_Workbench|FEM]] |
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|IconL=FEM_ConstraintCentrif.svg |
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|IconR=FEM_ConstraintInitialTemperature.svg |
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|IconC=Workbench_FEM.svg |
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}} |
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Latest revision as of 09:55, 21 April 2024
FEM ConstraintSelfWeight |
Menu location |
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Model → Mechanical boundary conditions and loads → Gravity load |
Workbenches |
FEM |
Default shortcut |
None |
Introduced in version |
- |
See also |
FEM tutorial |
Description
Defines a gravity acceleration acting on the whole model in the prescribed direction.
version 0.21 and below: The acceleration has a fixed value of 9.81 m/s^2.
Usage
- There are several ways to invoke the command:
- Press the Gravity load button.
- Select the Model → Mechanical boundary conditions and loads → Gravity load option from the menu.
- A ConstraintSelfWeight object is created.
- introduced in version 1.0: Optionally change its DataGravity Acceleration property.
- Optionally change its DataGravity Direction property.
Scripting
New object:
import ObjectsFem
ObjectsFem.makeConstraintSelfWeight(name)
Add object to the analysis named Analysis:
App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [(object)]
Example:
import ObjectsFem
selfweight_obj = ObjectsFem.makeConstraintSelfWeight("MySelfWeightObject")
App.ActiveDocument.Analysis.Member = App.ActiveDocument.Analysis.Member + [selfweight_obj]
Solver CalculiX
Limitations
- version 0.21 and below: You need to modify the .inp file to edit gravity acceleration.
- Self-weight is applied to the element set Eall which includes the whole model.
Editing CalculiX input file
The acceleration constant can be manually edited after generating the CalculiX input file.
Example of lines in the .inp file:
*DLOAD
Eall,GRAV,9810,0.0,0.0,-1.0
where 9810 is a gravity acceleration magnitude in [mm/s^2], and 0,0,-1 is the direction vector. The value can be set as a multiple of standard gravity acceleration to simulate loading of e.g. 4g.
Solver Z88
- Currently, not implemented in the Z88 solver.
FEM
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- Geometrical: Plane rotation, Section print, Transform
- Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight
- Thermal: Initial temperature, Heat flux, Temperature, Body heat source
- Overwrite Constants: Constant vacuum permittivity
- Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run
- Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
User documentation
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub