FEM ConstraintSelfWeight
Appearance
|
|
| Menu location |
|---|
| Model → Mechanical Boundary Conditions and Loads → Gravity Load |
| Workbenches |
| FEM |
| Default shortcut |
| None |
| Introduced in version |
| - |
| See also |
| FEM tutorial |
| Solvers |
|---|
| CalculiX, Elmer |
Description[edit | edit source]
Defines a gravity acceleration acting on the whole model in the prescribed direction.
0.21 and below: The acceleration has a fixed value of 9.81 m/s^2.
Cantilever with tip mass subjected to gravity load
Usage[edit | edit source]
- 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.
- Press the
- A ConstraintSelfWeight object is created.
- introduced in 1.0: Optionally change its DataGravity Acceleration property.
- Optionally change its DataGravity Direction property.
Scripting[edit | edit source]
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[edit | edit source]
Limitations[edit | edit source]
- 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[edit | edit source]
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[edit | edit source]
- Currently, not implemented in the Z88 solver.
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