FEM Workbench/ro: Difference between revisions

From FreeCAD Documentation
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=== Materiale ===
=== Materiale ===


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* [[Image:Fem-material.svg|32px]] [[FEM_MaterialSolid/ro|FEM material for solid]]: Vă permite să selectați un material din baza de date.
* [[Image:Fem-material.svg|32px]] [[FEM_MaterialSolid/ro|FEM material for solid]]: Vă permite să selectați un material din baza de date.
</div>


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* [[Image:Fem-material-fluid.svg|32px]] [[FEM_MaterialFluid|Material for fluid]]: Lets you select a material from the database.
* [[Image:Fem-material-fluid.svg|32px]] [[FEM_MaterialFluid|Material for fluid]]: Lets you select a material from the database.
</div>


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* [[Image:Fem-material-nonlinear.svg|32px]] [[FEM_MaterialMechanicalNonlinear/ro|Nonlinear mechanical material]]: Vă permite să selectați un material din baza de date..
* [[Image:Fem-material-nonlinear.svg|32px]] [[FEM_MaterialMechanicalNonlinear/ro|Nonlinear mechanical material]]: Vă permite să selectați un material din baza de date..
</div>


* [[Image:FEM_MaterialReinforced.svg|32px]] [[FEM_MaterialReinforced|Reinforced material (concrete)]]: Lets you select reinforced materials consisting of a matrix and a reinforcement from the database.
:* [[Image:FEM_MaterialReinforced.svg|32px]] [[FEM_MaterialReinforced|Reinforced material (concrete)]]: Lets you select reinforced materials consisting of a matrix and a reinforcement from the database.


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=== Element Geometry ===
=== Element Geometry ===


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* [[Image:Fem-beam-section.svg|32px]] [[FEM_ElementGeometry1D|Beam cross section]]:
* [[Image:Fem-beam-section.svg|32px]] [[FEM_ElementGeometry1D|Beam cross section]]:
</div>


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* [[Image:Fem-beam-rotation.svg|32px]] [[FEM_ElementRotation1D|Beam rotation]]:
* [[Image:Fem-beam-rotation.svg|32px]] [[FEM_ElementRotation1D|Beam rotation]]:
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* [[Image:Fem-shell-thickness.svg|32px]] [[FEM_ElementGeometry2D|Shell plate thickness]]:


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* [[Image:Fem-fluid-section.svg|32px]] [[FEM_ElementFluid1D|Fluid section for 1D flow]]:
* [[Image:Fem-shell-thickness.svg|32px]] [[FEM_ElementGeometry2D|Shell plate thickness]]:
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* [[Image:Fem-fluid-section.svg|32px]] [[FEM_ElementFluid1D|Fluid section for 1D flow]]:
=== Constrângeri Electrostatice ===
</div>
</div>


* [[Image:FEM_CompEmConstraints.png|x32px]] [[FEM_CompEmConstraints|Electromagnetic constraints]]: This is an icon menu in the FEM Constraints toolbar that holds the following constraints:
=== <span id="FEM_CompEmConstraints">Electromagnetic boundary conditions</span><!--Do not edit span id: the FEM_CompEmConstraints pages redirect here--> ===


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:* [[Image:FEM_ConstraintCurrentDensity.svg|32px]] [[FEM_ConstraintCurrentDensity|Constraint current density]]: Used to define a current density. {{Version|0.21}}
:* [[Image:FEM_ConstraintCurrentDensity.svg|32px]] [[FEM_ConstraintCurrentDensity|Current density boundary condition]]: Used to define a current density. {{Version|0.21}}


:* [[Image:FEM_ConstraintMagnetization.svg|32px]] [[FEM_ConstraintMagnetization|Constraint magnetization]]: Used to define a magnetization. {{Version|0.21}}
:* [[Image:FEM_ConstraintMagnetization.svg|32px]] [[FEM_ConstraintMagnetization|Magnetization boundary condition]]: Used to define a magnetization. {{Version|0.21}}


<span id="Fluid_Constraints"></span>
<span id="Fluid_boundary_conditions"></span>
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=== Fluid constraints ===
=== Fluid constraints ===
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* [[Image:FEM_ConstraintInitialPressure.svg|32px]] [[FEM_ConstraintInitialPressure|Constraint initial pressure]]: Used to define an initial pressure for a body (volume). {{Version|0.21}}
:* [[Image:FEM_ConstraintInitialPressure.svg|32px]] [[FEM_ConstraintInitialPressure|Initial pressure condition]]: Used to define an initial pressure for a body (volume). {{Version|0.21}}


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* [[Image:Fem-constraint-flow-velocity.svg|32px]] [[FEM_ConstraintFlowVelocity|Constraint flow velocity]]:
* [[Image:Fem-constraint-flow-velocity.svg|32px]] [[FEM_ConstraintFlowVelocity|Constraint flow velocity]]:
</div>


=== Geometrical Constraints ===
=== Geometrical analysis features ===


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* [[Image:Fem-constraint-planerotation.svg|32px]] [[FEM_ConstraintPlaneRotation/ro|Constraint plane rotation]]: Vă permite să definiți o constrângere de rotație a planului pe o fațetă plană
* [[Image:Fem-constraint-planerotation.svg|32px]] [[FEM_ConstraintPlaneRotation/ro|Constraint plane rotation]]: Vă permite să definiți o constrângere de rotație a planului pe o fațetă plană
</div>


* [[Image:FEM_ConstraintSectionPrint.svg|32px]] [[FEM_ConstraintSectionPrint|Constraint section print]]: Used to print the predefined facial output variables (forces and moments) to the dat file.
:* [[Image:FEM_ConstraintSectionPrint.svg|32px]] [[FEM_ConstraintSectionPrint|Section print feature]]: Used to print the predefined facial output variables (forces and moments) to the dat file.


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* [[Image:Fem-constraint-transform.svg|32px]] [[FEM_ConstraintTransform|Constraint transform]]:
* [[Image:Fem-constraint-transform.svg|32px]] [[FEM_ConstraintTransform|Constraint transform]]:
</div>


<span id="Mechanical_Constraints"></span>
<span id="Mechanical_boundary_conditions_and_loads"></span>
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=== Constrângeri Mecanice ===
=== Constrângeri Mecanice ===
</div>


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* [[Image:Fem-constraint-fixed.svg|32px]] [[FEM_ConstraintFixed/ro|Constraint fixed]]:Se utilizează pentru a defini o constrângere fixă pe punct/margine/fațetă (e)..
* [[Image:Fem-constraint-fixed.svg|32px]] [[FEM_ConstraintFixed/ro|Constraint fixed]]:Se utilizează pentru a defini o constrângere fixă pe punct/margine/fațetă (e)..
</div>


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* [[Image:Fem-constraint-displacement.svg|32px]] [[FEM_ConstraintDisplacement|Constraint displacement]]: Used to define a displacement constraint on point/edge/face(s).
* [[Image:Fem-constraint-displacement.svg|32px]] [[FEM_ConstraintDisplacement|Constraint displacement]]: Used to define a displacement constraint on point/edge/face(s).
</div>


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* [[Image:Fem-constraint-contact.svg|32px]] [[FEM_ConstraintContact/ro|Constraint contact]]: Utilizat pentru a defini contactul de constrângere între două fațete.
* [[Image:Fem-constraint-contact.svg|32px]] [[FEM_ConstraintContact/ro|Constraint contact]]: Utilizat pentru a defini contactul de constrângere între două fațete.
</div>


* [[Image:FEM_ConstraintTie.svg|32px]] [[FEM_ConstraintTie|Constraint tie]]: Used to define a tie constraint ("bonded contact") between two faces.
:* [[Image:FEM_ConstraintTie.svg|32px]] [[FEM_ConstraintTie|Tie constraint]]: Used to define a tie constraint ("bonded contact") between two faces.


* [[Image:FEM_ConstraintSpring.svg|32px]] [[FEM_ConstraintSpring|Constraint spring]]: Used to define a spring. {{Version|0.20}}
:* [[Image:FEM_ConstraintSpring.svg|32px]] [[FEM_ConstraintSpring|Spring]]: Used to define a spring. {{Version|0.20}}


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* [[Image:Fem-constraint-force.svg|32px]] [[FEM_ConstraintForce/ro|Constraint force]]: Utilizat pentru a defini o forță exprimată în [N] aplicată unifrom pe fațetă selectată într-o direcție definibilă.
* [[Image:Fem-constraint-force.svg|32px]] [[FEM_ConstraintForce/ro|Constraint force]]: Utilizat pentru a defini o forță exprimată în [N] aplicată unifrom pe fațetă selectată într-o direcție definibilă.
</div>


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* [[Image:Fem-constraint-pressure.svg|32px]] [[FEM_ConstraintPressure/ro|Constraint pressure]]: Utilizat pentru a defini constrângere de presiune.
* [[Image:Fem-constraint-pressure.svg|32px]] [[FEM_ConstraintPressure/ro|Constraint pressure]]: Utilizat pentru a defini constrângere de presiune.
</div>


* [[Image:FEM_ConstraintCentrif.svg|32px]] [[FEM_ConstraintCentrif|Constraint centrif]]: Used to define a centrifugal body load constraint. {{Version|0.20}}
:* [[Image:FEM_ConstraintCentrif.svg|32px]] [[FEM_ConstraintCentrif|Centrifugal load]]: Used to define a centrifugal body load constraint. {{Version|0.20}}


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* [[Image:Fem-constraint-selfweight.svg|32px]] [[FEM_ConstraintSelfWeight/ro|Constraint self weight]]: Utilizat pentru a defini accelerația gravitațională care acționează asupra modelului.
* [[Image:Fem-constraint-selfweight.svg|32px]] [[FEM_ConstraintSelfWeight/ro|Constraint self weight]]: Utilizat pentru a defini accelerația gravitațională care acționează asupra modelului.
</div>


<span id="Thermal_Constraints"></span>
<span id="Thermal_boundary_conditions_and_loads"></span>
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=== Constrângeri termice ===
=== Constrângeri termice ===
</div>


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* [[Image:Fem-constraint-InitialTemperature.svg|32px]] [[FEM_ConstraintInitialTemperature/ro|Constraint initial temperature]]: Utilizat pentru a defini temperatura inițială a corpului.
* [[Image:Fem-constraint-InitialTemperature.svg|32px]] [[FEM_ConstraintInitialTemperature/ro|Constraint initial temperature]]: Utilizat pentru a defini temperatura inițială a corpului.
</div>


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* [[Image:Fem-constraint-heatflux.svg|32px]] [[FEM_ConstraintHeatflux/ro|Constraint heatflux]]: Utilizat pentru a defini fluxul de căldură constrâns pe o fațetă(e).
* [[Image:Fem-constraint-heatflux.svg|32px]] [[FEM_ConstraintHeatflux/ro|Constraint heatflux]]: Utilizat pentru a defini fluxul de căldură constrâns pe o fațetă(e).
</div>


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* [[Image:Fem-constraint-temperature.svg|32px]] [[FEM_ConstraintTemperature/ro|Constraint temperature]]: Utilizat pentru a defini constrângerea de temperatură pe un punct/muchie/fațetă(e).
* [[Image:Fem-constraint-temperature.svg|32px]] [[FEM_ConstraintTemperature/ro|Constraint temperature]]: Utilizat pentru a defini constrângerea de temperatură pe un punct/muchie/fațetă(e).
</div>

* [[Image:Fem-constraint-heatflux.svg|32px]] [[FEM_ConstraintBodyHeatSource/ro|Constraint body heat source]]:

=== Constraints without solver ===


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* [[Image:Fem-constraint-fluid-boundary.svg|32px]] [[FEM_ConstraintFluidBoundary|Constraint fluid boundary]]:
* [[Image:Fem-constraint-heatflux.svg|32px]] [[FEM_ConstraintBodyHeatSource/ro|Constraint body heat source]]:
</div>
</div>

* [[Image:Fem-constraint-bearing.svg|32px]] [[FEM_ConstraintBearing/ro|Constraint bearing]]: Utilizat pentru a defini o constrângere de rulment.

* [[Image:Fem-constraint-gear.svg|32px]] [[FEM_ConstraintGear/ro|Constraint gear]]: Utilizat pentru a defini o constrângere de angrenaj de roți dințate.

* [[Image:Fem-constraint-pulley.svg|32px]] [[FEM_ConstraintPulley/ro|Constraint pulley]]: Utilizat pentru a defini o constrângere de tip fulie.


=== Overwrite Constants ===
=== Overwrite Constants ===


* [[Image:FEM_ConstantVacuumPermittivity.svg|32px]] [[FEM_ConstantVacuumPermittivity|Constant vacuum permittivity]]: Used to overwrite the [https://en.wikipedia.org/wiki/Vacuum_permittivity permittivity of vacuum] with a custom value.
:* [[Image:FEM_ConstantVacuumPermittivity.svg|32px]] [[FEM_ConstantVacuumPermittivity|Constant vacuum permittivity]]: Used to overwrite the [https://en.wikipedia.org/wiki/Vacuum_permittivity permittivity of vacuum] with a custom value.


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* [[Image:FEM_CompMechEquations.png|x32px]] [[FEM_CompMechEquations|Mechanical equations]]: This is an icon menu in the FEM Equations toolbar that holds the following equations: {{Version|0.21}}
=== <span id="FEM_CompMechEquations">Mechanical equations</span><!--Do not edit span id: the FEM_CompMechEquations pages redirect here--> ===


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:* [[Image:FEM_EquationDeformation.svg|32px]] [[FEM_EquationDeformation|Deformation equation]]: Equation for the [[Image:FEM_SolverElmer.svg|32px]] [[FEM_SolverElmer|Solver Elmer]] to perform nonlinear mechanical analyses (deformations). {{Version|0.21}}
:* [[Image:FEM_EquationDeformation.svg|32px]] [[FEM_EquationDeformation|Deformation equation]]: Equation for the [[Image:FEM_SolverElmer.svg|32px]] [[FEM_SolverElmer|Solver Elmer]] to perform nonlinear mechanical analyses (deformations). {{Version|0.21}}


* [[Image:FEM_CompEmEquations.png|x32px]] [[FEM_CompEmEquations|Electromagnetic equations]]: This is an icon menu in the FEM Equations toolbar that holds the following equations: {{Version|0.21}}
=== <span id="FEM_CompEmEquations">Electromagnetic equations</span><!--Do not edit span id: the FEM_CompEmEquations pages redirect here--> ===


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=== <span id="FEM_PostCreateFunctions">Filter functions</span><!--Do not edit span id: the FEM_PostCreateFunctions pages redirect here--> ===
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* [[Image:Fem-post-geo-sphere.svg|32px]] [[FEM_PostCreateFunctions|Post Create functions]]:
</div>


:* [[Image:FEM_PostCreateFunctionPlane.svg|32px]] [[FEM_PostCreateFunctionPlane|Filter function plane]]: Cuts the result mesh with a plane.
:* [[Image:FEM_PostCreateFunctionPlane.svg|32px]] [[FEM_PostCreateFunctionPlane|Plane]]: Cuts the result mesh with a plane.


:* [[Image:FEM_PostCreateFunctionSphere.svg|32px]] [[FEM_PostCreateFunctionSphere|Filter function sphere]]: Cuts the result mesh with a sphere.
:* [[Image:FEM_PostCreateFunctionSphere.svg|32px]] [[FEM_PostCreateFunctionSphere|Sphere]]: Cuts the result mesh with a sphere.


:* [[Image:FEM_PostCreateFunctionCylinder.svg|32px]] [[FEM_PostCreateFunctionCylinder|Filter function cylinder]]: Cuts the result mesh with a cylinder. {{Version|0.21}}
:* [[Image:FEM_PostCreateFunctionCylinder.svg|32px]] [[FEM_PostCreateFunctionCylinder|Cylinder]]: Cuts the result mesh with a cylinder. {{Version|0.21}}


:* [[Image:FEM_PostCreateFunctionBox.svg|32px]] [[FEM_PostCreateFunctionBox|Filter function box]]: Cuts the result mesh with a box. {{Version|0.21}}
:* [[Image:FEM_PostCreateFunctionBox.svg|32px]] [[FEM_PostCreateFunctionBox|Box]]: Cuts the result mesh with a box. {{Version|0.21}}


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Revision as of 09:51, 30 September 2023

FEM workbench icon

Introducere

FEM Workbench  oferă un flux modern de analiză prin metoda elementelor finite (MEF) pentru FreeCAD. În principal, acest lucru înseamnă că toate instrumentele pentru a face o analiză prin Metoda Elementului Finit sunt combinate într-o singură interfață grafică(GUI).

Plan de lucru

Pașii pentru a face AEF în Atelierul AEF din FreeCAD GUI sunt:

  • Preprocesare, setting up the analysis problem.
    • Modelarea geometriei, în care FreeCAD este deja un software aproape dezvoltat: creating the geometry with FreeCAD, or importing it from a different application.
    • Creați o analiză:
      • Creați o Plasă AEF din modelul geometric.
      • Adăugați la modelul de analiză constrângeri, cum ar fi sarcini și corecții de asistență.
      • Adăugați un material la modelul de analiză
  • Rezolvarea: Rezolvați sistemul de ecuații din cadrul GUI-ului FreeCAD.
  • Postprocesare: Vezi rezultatele din FreeCAD GUI.

Începând cu versiunea 0.15 a FreeCAD, Atelierul AEF poate fi folosit pe platforme Windows, Mac OSX și Linux. Deoarece Atelierul AEF folosește software extern, cantitatea de intervenție manuală până când Atelierul AEF este gata de utilizare va depinde de sistemul de operare pe care îl utilizați. Verificați FEM Install page for instructions on setting up the external tools.

Workflow of the FEM Workbench; the workbench calls two external programs to perform meshing of a solid object, and perform the actual solution of the finite element problem

Meniu: Model

  • Analysis container: Creează un nou container pentru analiza mecanică. Dacă un solid este selectat în vederea arborescentă înainte de a face click pe el dialogul plasei de discretizare va fi deschis alături

Materiale

Element Geometry

Electromagnetic boundary conditions

Fluid constraints

Geometrical analysis features

  • Section print feature: Used to print the predefined facial output variables (forces and moments) to the dat file.

Constrângeri Mecanice

  • Constraint fixed:Se utilizează pentru a defini o constrângere fixă pe punct/margine/fațetă (e)..
  • Constraint contact: Utilizat pentru a defini contactul de constrângere între două fațete.
  • Tie constraint: Used to define a tie constraint ("bonded contact") between two faces.
  • Constraint force: Utilizat pentru a defini o forță exprimată în [N] aplicată unifrom pe fațetă selectată într-o direcție definibilă.
  • Constraint self weight: Utilizat pentru a defini accelerația gravitațională care acționează asupra modelului.

Constrângeri termice

  • Constraint heatflux: Utilizat pentru a defini fluxul de căldură constrâns pe o fațetă(e).
  • Constraint temperature: Utilizat pentru a defini constrângerea de temperatură pe un punct/muchie/fațetă(e).

Overwrite Constants

Meniu plase/Mesh

  • Nodes set: Creates/defines a node set from FEM mesh.

Meniu Rezolvitori

  • Solver Calculix CCX tools: Creează un nou rezolvitor pentru această analiză. În cele mai multe cazuri rezolvitorul este creat împreună cu analiza.

Mechanical equations

Electromagnetic equations

Meniu Rezultate

  • Result show: Utilizează afișarea rezultatelor analizei

Filter functions

  • Plane: Cuts the result mesh with a plane.
  • Sphere: Cuts the result mesh with a sphere.

Meniu: Utilități

Meniu de Context

  • Display FEM mesh info: Displays basic statistics of existing mesh - number of nodes and elements of each type.

Preferințe

!!FUZZY!!* Preferences...: Preferințe disponibile în Instrumentele MEF.

Links

FEM Install pentru o detaliată descriere a modului cum lucrează Modului MEF.

The following pages explain different topics of the FEM Workbench.

FEM Install: a detailed description on how to set up the external programs used in the workbench.

FEM Mesh pentru informații suplimentere privind AEF asupra Plaselor în Modulul MEF din FreeCAD

FEM Solver for further Informations about FEM Solvers in FEM Module,

FEM CalculiX Pentru informații suplimentare despre Calculix, cel mai folosit ți bine dezvoltat rezolvitor în Modulul MEF

FEM Concrete for informations about analysis's of concrete structures.

Tutorials

Tutoriale

Tutorial 1 FEM CalculiX Cantilever 3D

Tutorial 2 FEM Tutorial

Tutorial 3 FEM Tutorial Python

Tutorial 4 FEM Shear of a Composite Block

Tutorial 5: Transient FEM analysis

Tutorial 6: Post-Processing of FEM Results with Paraview

Tutorial 7: FEM Example Capacitance Two Balls; Elmer's GUI tutorial 6 "Electrostatics Capacitance Two Balls" using FEM Examples.

Cuprins tutoriale de analiză termică la piese mecanice PDF's

Video Tutorial 1 Forum post with you tube link

Video Tutorial 2 Forum post with you tube link

Further video Tutorials Forum post with you tube link

Extending the FEM Workbench

The FEM Workbench is under constant development. An objective of the project is to find ways to easily interact with various FEM solvers, so that the end user can streamline the process of creating, meshing, simulating, and optimizing an engineering design problem, all within FreeCAD.

The following information is aimed at power users and developers who want to extend the FEM Workbench in different ways. Familiarity with C++ and Python is expected, and also some knowledge of the "document object" system used in FreeCAD is necessary; this information is available in the Power users hub and the Developer hub. Please notice that since FreeCAD is under active development, some articles may be too old, and thus obsolete. The most up to date information is discussed in the FreeCAD forums, in the Development section. For FEM discussions, advice or assistance in extending the workbench, the reader should refer to the FEM subforum.

A developer's guide has been written to help power users in understanding the complex FreeCAD codebase and the interactions between the core elements and the individual workbenches. The book is hosted at github so multiple users can contribute to it and keep it updated.

Extending the FEM Workbench documentation