FEM CalculiX/ru: Difference between revisions
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== Introduction == |
== Introduction == |
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This page collects information on the [http://www.calculix.de/ CalculiX] finite element solver, the default solver in the |
This page collects information on the [http://www.calculix.de/ CalculiX] finite element solver, the default solver in the [[Image:Workbench_FEM.svg|24px]] [[FEM_Workbench|FEM Workbench]] for structural and thermo-mechanical analysis. Depending on the operating system you are working with, you'll need to install CalculiX before running your first simulation. Please see [[FEM_Install|FEM Install]]. |
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The solver is able to do linear and non-linear calculations, for static, dynamic, and thermal problems. The solver operates on an Abaqus input file ({{incode|.inp}}), which means it can be used with different pre-processors that support this format. The program includes its own graphical preprocessor which, however, is not used by FreeCAD, only the solver itself. |
The solver is able to do linear and non-linear calculations, for static, dynamic, and thermal problems. The solver operates on an Abaqus input file ({{incode|.inp}}), which means it can be used with different pre-processors that support this format. The program includes its own graphical preprocessor which, however, is not used by FreeCAD, only the solver itself. |
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The CalculiX interface supports the following objects: |
The CalculiX interface supports the following objects: |
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<span id="FEM_Elements"></span> |
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=== FEM Elements === |
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=== Элементы МКЭ === |
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* Tet4 and Tet10 |
* Tet4 and Tet10 |
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* and those described in [[FEM_Mesh_CalculiX|FEM Mesh CalculiX]] |
* and those described in [[FEM_Mesh_CalculiX|FEM Mesh CalculiX]] |
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= |
<span id="Analysis"></span> |
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=== Анализ === |
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* Linear static analysis |
* Linear and nonlinear static analysis |
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* Frequency analysis |
* Frequency analysis |
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* Linear buckling analysis |
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* Coupled thermal-structural analysis |
* Coupled thermal-structural analysis |
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<span id="Materials"></span> |
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=== Материалы === |
=== Материалы === |
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* |
* Linear elastic isotropic materials (uniformity in all directions) |
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* Plasticity with isotropic hardening |
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* Multiple material use is in development |
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== Postprocessing interface == |
== Postprocessing interface == |
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The FEM Workbench loads CalculiX results |
The FEM Workbench loads CalculiX results into a [[FEM_ResultShow|result object]] which will contain: |
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* Displacements |
* Displacements |
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* Stresses |
* Stresses |
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* Equivalent plastic strain (PEEQ) – if nonlinear material was used |
* Equivalent plastic strain (PEEQ) – if nonlinear material was used |
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* Temperature – for thermomechanical analysis |
* Temperature – for thermomechanical analysis |
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FreeCAD reads results from *.frd file which was created by |
FreeCAD reads results from *.frd file which was created by CalculiX. If these results contain multiple time steps, each time step is imported to FreeCAD as a new result object. Same behavior applies for Frequency or Buckling analysis with multiple eigenvalues. |
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Reaction forces can be found in ccx_dat_file which contains reaction force components (fx, fy, fz) for each |
Reaction forces can be found in ccx_dat_file which contains reaction force components (fx, fy, fz) for each fixed boundary condition and for each displacement boundary condition which constrains translation degrees of freedom. |
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== Related == |
== Related == |
Latest revision as of 18:46, 7 December 2023
Introduction
This page collects information on the CalculiX finite element solver, the default solver in the FEM Workbench for structural and thermo-mechanical analysis. Depending on the operating system you are working with, you'll need to install CalculiX before running your first simulation. Please see FEM Install.
The solver is able to do linear and non-linear calculations, for static, dynamic, and thermal problems. The solver operates on an Abaqus input file (.inp
), which means it can be used with different pre-processors that support this format. The program includes its own graphical preprocessor which, however, is not used by FreeCAD, only the solver itself.
CalculiX is designed to run on Unix platforms like Linux and Irix computers but also on MS-Windows. CalculiX was developed by engineers from MTU Aero Engines, Munich, Germany, to assist them in designing machinery such as jet turbines. The software is currently released to the public on the terms of the GPL version 2.
Integration with FreeCAD
Interaction between the FEM Workbench and CalculiX is done through writing and reading text files. The sequence of operations is as follows:
- A CalculiX input file is created with details required to run the simulation
- The CalculiX solver is started with this input file
- The output from the solver is logged
- The output files from the solver are read, if they are available
The FEM Control Solver tool manages the whole process. User interaction in the process is possible.
Preprocessing interface
The input file that CalculiX uses can be prepared and edited before the solver is started. The units used in the input file are independent of the units set in FreeCAD; they will always be millimeters (mm) and Newton (N).
(ToDo: check this. What happens with the mesh if inch is used in FreeCAD? As density was introduced, with this we have kg and s and no longer N?! how about this?!)
The CalculiX interface supports the following objects:
Элементы МКЭ
- Tet4 and Tet10
- S3 and S6
- B31 and B32
- and those described in FEM Mesh CalculiX
Анализ
- Linear and nonlinear static analysis
- Frequency analysis
- Linear buckling analysis
- Coupled thermal-structural analysis
Материалы
- Linear elastic isotropic materials (uniformity in all directions)
- Plasticity with isotropic hardening
Postprocessing interface
The FEM Workbench loads CalculiX results into a result object which will contain:
- Displacements
- Stresses
- Strains
- Equivalent plastic strain (PEEQ) – if nonlinear material was used
- Temperature – for thermomechanical analysis
FreeCAD reads results from *.frd file which was created by CalculiX. If these results contain multiple time steps, each time step is imported to FreeCAD as a new result object. Same behavior applies for Frequency or Buckling analysis with multiple eigenvalues.
Reaction forces can be found in ccx_dat_file which contains reaction force components (fx, fy, fz) for each fixed boundary condition and for each displacement boundary condition which constrains translation degrees of freedom.
Related
- FEM Mesh CalculiX
- CalculiX preferences dialog menu in the FEM Workbench preferences menu
- 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