FEM Module/pt-br

Introdução
A bancada FEM fornece um fluxo de trabalho moderno de análise de elementos finitos (FEA) para o FreeCAD. Isso significa que todas as ferramentas para fazer uma análise são combinadas em uma interface gráfica de usuário (GUI).



Fluxo de Trabalho
Os passos para realizar uma análise de elementos finitos são:
 * 1) Pré-processamento: configurar o problema de análise.
 * 2) Modelando a geometria: criar a geometria com o FreeCAD ou importando-a de um aplicativo diferente.
 * 3) Criando uma análise.
 * 4) Adicionando restrições de simulação, como cargas e suportes fixos ao modelo geométrico.
 * 5) Adicionando materiais às partes do modelo geométrico.
 * 6) Criando uma malha de elementos finitos para o modelo geométrico ou importando-os de um aplicativo diferente.
 * 7) Resolvendo: executando um solucionador externo de dentro do FreeCAD.# Pós-processamento: visualizar os resultados da análise a partir do FreeCAD ou exportar os resultados para que possam ser pós-processados com outra aplicação.

A partir do FreeCAD 0.15, a bancada FEM pode ser usada no Linux, Windows e Mac OSX. Como o ambiente de trabalho faz uso de solucionadores externos, a quantidade de configuração manual dependerá do sistema operacional que você está usando. Veja Instalação da FEM para instruções sobre como configurar as ferramentas externas.



Menu: Modelo

 * [[Image:Fem-analysis.svg|32px]] Contêiner de análise: Cria um novo contêiner de análise mecânica. Se um sólido é selecionado na árvore de visualização antes de clicar nele, a janela de malha vai ser aberta em seguida.

Materiais

 * [[Image:Fem-material.svg|32px]] Material para sólidos: Permite você selecionar um material a partir do banco de dados.


 * [[Image:Fem-material-fluid.svg|32px]] Material para fluidos: Permite você selecionar um material a partir do banco de dados.


 * [[Image:Fem-material-nonlinear.svg|32px]] Material mecânico não linear: Permite você selecionar um material a partir do banco de dados.


 * Material reforçado: Permite selecionar materiais reforçados constituídos por uma matriz e um reforço da base de dados.


 * [[Image:Arch_Material_Group.svg|32px]] Editor de materiais:: Permite que você abra o editor de materiais para editar materiais.

Geometria do Elemento

 * [[Image:Fem-beam-section.svg|32px]] Seção transversal da viga


 * [[Image:Fem-beam-rotation.svg|32px]] Rotação de viga


 * [[Image:Fem-shell-thickness.svg|32px]] Espessura da casca de placa


 * [[Image:Fem-fluid-section.svg|32px]] Seção do fluido para fluxo 1D

Restrições Eletrostáticas

 * [[Image:fem-constraint-electrostatic-potential.svg|32px]] Restrição de potencial eletrostático

Restrições do Fluido

 * [[Image:Fem-constraint-initial-flow-velocity.svg|32px]] Restrição de velocidade inicial do fluxo:


 * [[Image:Fem-constraint-fluid-boundary.svg|32px]] Limite de fluido de restrição


 * [[Image:Fem-constraint-flow-velocity.svg|32px]] Constraint flow velocity:

Mechanical constraints

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


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


 * [[Image:Fem-constraint-planerotation.svg|32px]] Constraint plane rotation: Used to define a plane rotation constraint on a planar face.


 * [[Image:Fem-constraint-contact.svg|32px]] Constraint contact: Used to define a contact constraint between two faces.


 * [[Image:Fem-constraint-transform.svg|32px]] Constraint transform:


 * [[Image:Fem-constraint-force.svg|32px]] Constraint force: Used to define a force in [N] applied uniformly to a selectable face in a definable direction.


 * [[Image:Fem-constraint-pressure.svg|32px]] Constraint pressure: Used to define a pressure constraint.


 * [[Image:Fem-constraint-selfweight.svg|32px]] Constraint self weight: Used to define a gravity acceleration acting on a model.


 * [[Image:Fem-constraint-bearing.svg|32px]] Constraint bearing: Used to define a bearing constraint.


 * [[Image:Fem-constraint-gear.svg|32px]] Constraint gear: Used to define a gear constraint.


 * [[Image:Fem-constraint-pulley.svg|32px]] Constraint pulley: Used to define a pulley constraint.

Thermal constraints

 * [[Image:Fem-constraint-InitialTemperature.svg|32px]] Constraint initial temperature: Used to define the initial temperature of a body.


 * [[Image:Fem-constraint-heatflux.svg|32px]] Constraint heatflux: Used to define a heat flux constraint on a face(s).


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


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

Menu: Mesh

 * [[Image:Fem-femmesh-netgen-from-shape.svg|32px]] FEM mesh from shape by Netgen:


 * [[Image:Fem-femmesh-gmsh-from-shape.svg|32px]] FEM mesh from shape by GMSH:


 * [[Image:Fem-femmesh-boundary-layer.svg|32px]] FEM mesh boundary layer:


 * [[Image:Fem-femmesh-region.svg|32px]] FEM mesh region:


 * [[Image:Fem-femmesh-from-shape.svg|32px]] FEM mesh group:


 * [[Image:Fem-femmesh-create-node-by-poly.svg|32px]] Nodes set: Creates/defines a node set from FEM mesh.


 * [[Image:Fem-femmesh-to-mesh.svg|32px]] FEM mesh to mesh: Convert the surface of a FEM mesh to a mesh.

Menu: Solve

 * [[Image:Fem-solver.svg|32px]] Solver Calculix CCX tools: Creates a new solver for this analysis. In most cases the solver is created together with the analysis.


 * [[Image:Fem-solver.svg|32px]] Solver CalculiX:


 * [[Image:Fem-elmer.svg|32px]] Solver Elmer:


 * [[Image:Fem-solver.svg|32px]] Solver Z88:


 * [[Image:Fem-equation-heat.svg|32px]] Equation heat:


 * [[Image:Fem-equation-elasticity.svg|32px]] Equation elasticity:


 * [[Image:Fem-equation-electrostatic.svg|32px]] Equation electrostatic:


 * [[Image:Fem-equation-fluxsolver.svg|32px]] Equation fluxsolver:


 * [[Image:Fem-equation-flow.svg|32px]] Equation flow:


 * [[Image:Fem-control-solver.svg|32px]] Solver job control: Opens the menu to adjust and start the selected solver.


 * [[Image:Fem-run-solver.svg|32px]] Solver run calculation: Runs the selected solver of the active analysis.

Menu: Results

 * [[Image:Fem-purge-results.svg|32px]] Results purge: Deletes the results of the active analysis.


 * [[Image:Fem-result.svg|24px]] Result show: Used to display the result of an analysis.


 * [[Image:FEM_PostApplyChanges.png|32px]] Post Apply changes:


 * [[Image:Fem-data.svg|32px]] Post Pipeline from result:


 * [[Image:Fem-warp.svg|32px]] Post Create warp vector filter:


 * [[Image:Fem-clip-scalar.svg|32px]] Post Create scalar clip filter:


 * [[Image:Fem-cut.svg|32px]] Post Create cut filter:


 * [[Image:Fem-clip.svg|32px]] Post Create clip filter:


 * [[Image:Fem-DataAlongLine.svg|32px]] Post Create data along line filter:


 * [[Image:Fem-linearizedstresses.svg|32px]] Post Create linearized stresses:


 * [[Image:fem-post-filter-data-at-point.png|32px]] Post Create data at point filter:


 * [[Image:Fem CompPostCreateFunctions.png|48px]] Post Create functions:
 * [[Image:Fem-sphere.svg|32px]] :
 * [[Image:Fem-plane.svg|32px]] :

Menu: Utilities

 * [[Image:fem-clipping-plane-add.svg|32px]] Clipping plane on face:


 * [[Image:fem-clipping-plane-remove-all.svg|32px]] Remove all clipping planes:

Context Menu

 * [[Image:Fem-femmesh-clear-mesh.svg|32px]] FEM mesh clear:


 * [[Image:Fem-femmesh-print-info.svg|32px]] FEM mesh print info:

Preferences

 * [[Image:Std_DlgParameter.svg|32px]] Preferences...: Preferences available in FEM Tools.

Information
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: further information on obtaining a mesh for finite element analysis.

FEM Solver: further information on the different solvers available in the workbench, and those that could be used in the future.

FEM CalculiX: further information on CalculiX, the default solver used in the workbench for structural analysis.

FEM Concrete: interesting information on the topic of simulating concrete structures.

FEM Project: further information on the unit system, limitations, and the development ideas and roadmap of the workbench.

Tutorials
Tutorial 1: FEM CalculiX Cantilever 3D; basic simply supported beam analysis.

Tutorial 2: FEM Tutorial; simple tension analysis of a structure.

Tutorial 3: FEM Tutorial Python; set up the cantilever example entirely through scripting in Python, including the mesh.

Tutorial 4: FEM Shear of a Composite Block; see the deformation of a block that is comprised of two materials.

Coupled thermal mechanical analysis tutorials by openSIM

Video tutorial 1: FEM video for beginner (including YouTube link)

Video tutorial 2: FEM video for beginner (including YouTube link)

Many video tutorials: anisim Open Source Engineering Software (in German)

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.

The following articles explain how the workbench can be extended, for example, by adding new types of boundary conditions (constraints), or equations.
 * Extend FEM Module
 * Add FEM Constraint Tutorial
 * Add FEM Equation Tutorial

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.
 * Early preview of ebook: Module developer' guide to FreeCAD source (forum thread)
 * FreeCAD Mod Dev Guide (github repository)