FEM CalculiX
Introduction
Prefață
Această pagină colectează toate informațiile despre solver CalculiX [CalculiX], cel mai utilizat și cel mai bine dezvoltat solver din modulul FEM. În funcție de sistemul de operare pe care îl lucrați cu dvs., trebuie să instalați mai întâi CalculiX. Verificați 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-like 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
Interfața
Interacțiunea dintre modulul FEM și CalculiX se face prin fișiere text. Modulul FEM scrie un fișier de intrare CalculiX, pornește CalculiX, înregistrează ieșirea CalculiX și citește fișierele de ieșire ale CalculiX dacă acestea sunt disponibile. Instrumentul FEM Control Solver gestionează întregul proces. Interacțiunea cu utilizatorul în acest proces este posibilă.
- 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. CalculiX doesn't use units and it's the user's responsibility to ensure that the same unit system is used consistently in the whole input deck. The units in which FreeCAD writes the input file are independent of the unit system set in FreeCAD's project or preferences. The input file is always written using the SI(mm) unit system:
- length: mm,
- force: N,
- mass: tonne,
- time: s,
- stress: MPa,
- energy: mJ,
- density: tonne/mm^3.
The CalculiX interface supports the following objects:
Finite elements
- 3D solid:
- tetrahedral: C3D4, C3D10
- hexahedral: C3D8(R), C3D20(R)
- 3D shell and membrane:
- triangular: S3, S6, M3D3, M3D6
- quadrilateral: S4(R), S8(R), M3D4(R), M3D8(R)
- 2D plane stress, plane strain and axisymmetric:
- triangular: CPS3, CPS6, CPE3, CPE6, CAX3, CAX6
- quadrilateral: CPS4(R), CPS8(R), CPE4(R), CPE8(R), CAX4(R), CAX8(R)
- 3D beam and truss: B31(R), B32(R), T3D2, T3D3
More details about the supported CalculiX elements can be found on the FEM Mesh CalculiX page.
Analysis
- Linear and nonlinear static analysis
- Frequency analysis
- Linear buckling analysis
- Coupled and uncoupled thermal-structural analysis, pure heat transfer analysis
- Electrostatic analysis
Materials
- Linear elastic isotropic materials (uniform properties in all directions)
- Plasticity with isotropic or kinematic hardening
Postprocessing interface
Interfață postprocesare
citiți stresul rezultat (Von Mises) și toate deplasările
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 page in the FEM Workbench preferences
- Materials: Solid Material, Fluid Material, Non-Linear Mechanical Material, Reinforced Material (Concrete); Material Editor
- Element Geometry: Beam Cross Section, Beam Rotation, Shell Plate Thickness, Fluid Section for 1D Flow
- Electromagnetic Boundary Conditions: Electrostatic Potential Boundary Condition, Current Density Boundary Condition, Magnetization Boundary Condition, Electric Charge Density
- Fluid Boundary Conditions: Initial Flow Velocity Condition, Initial Pressure Condition, Flow Velocity Boundary Condition
- Geometrical Analysis Features: Plane Multi-Point Constraint, Section Print Feature, Local Coordinate System
- Mechanical Boundary Conditions and Loads: Fixed Boundary Condition, Rigid Body Constraint, Displacement Boundary Condition, Contact Constraint, Tie Constraint, Spring Boundary Condition, Force Load, Pressure Load, Centrifugal Load, Gravity Load
- Thermal Boundary Conditions and Loads: Initial Temperature, Heat Flux Load, Temperature Boundary Condition, Body Heat Source
- Overwrite Constants: Constant Vacuum Permittivity
- Mesh: Mesh From Shape by Netgen, Mesh From Shape by Gmsh, Mesh Boundary Layer, Mesh Refinement, Mesh Group, Erase Elements, FEM Mesh to Mesh
- Solve: Solver CalculiX, Solver Elmer, Solver Mystran, Solver Z88; Mechanical Equations: Elasticity Equation, Deformation Equation; Electromagnetic Equations: Electrostatic Equation, Electricforce Equation, Magnetodynamic Equation, Magnetodynamic 2D Equation, Static Current Equation; Flow Equation, Flux Equation, Heat Equation, Solver Job Control, Run Solver
- Results: Purge Results, Show Result, Apply Changes to Pipeline, Post Pipeline From Result, Pipeline Branch, Warp Filter, Scalar Clip Filter, Function Cut Filter, Region Clip Filter, Contours Filter, Glyph Filter, Line Clip Filter, Stress Linearization Plot, Data at Point Clip Filter, Calculator Filter; Filter Functions: Plane, Sphere, Cylinder, Box; Data Visualizations: Create Lineplot, Create Histogram, Create Table
- Utilities: Clipping Plane on Face, Remove All Clipping Planes, FEM Examples; Clear FEM Mesh, Display Mesh Info
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types