有限要素法ワークベンチ
はじめに
FEM Workbenchは、FreeCAD用の最新の有限要素解析(FEA)ワークフローを提供します。 主にこれは、分析を行うすべてのツールが1つのグラフィカルユーザーインターフェイス(GUI)に統合されていることを意味します。
ワークフロー
有限要素解析を実行する手順は次のとおりです。 #前処理:分析問題を設定する。
- ジオメトリのモデリング:FreeCADでジオメトリを作成するか、別のアプリケーションからジオメトリをインポートします。
- 分析を作成する。
- 幾何モデルのための有限要素メッシュの作成。
- 荷重や固定されたサポートなどの制約をモデルに追加する。
- 解析モデルに材料を追加する。
#Solving:FreeCAD内の外部ソルバーを使用して方程式系を解く。 #Postprocessing:FreeCAD内の解析結果を視覚化します。
FreeCAD 0.15以降、FEM WorkbenchはWindows、MacOSX、Linuxプラットフォームで使用できます。 ワークベンチは外部ソルバーを使用するため、手動セットアップの量は使用しているオペレーティングシステムによって異なります。 外部ツールの設定方法については、 FEM Installページを参照してください。
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
メニュー:モデル
- Analysis container: Creates a new container for a mechanical analysis. If a solid is selected in the tree view before clicking on it, the meshing dialog will be opened next.
材料
- Material for solid: Lets you select a material from the database.
- Material for fluid: Lets you select a material from the database.
- Nonlinear mechanical material: Lets you select a material from the database.
- Reinforced material: Lets you select reinforced materials consist of a matrix and a reinforcement from the database.
- Material editor:: Lets you open the material editor to edit materials
要素の幾何学
- Fluid section for 1D flow: Creates a FEM fluid section element for pneumatic and hydraulic networks.
Electrostatic Constraints
流体の制約
- Constraint initial flow velocity: Used to define an initial flow velocity for the domain.
- Constraint flow velocity: Used to define a flow velocity as a boundary condition at an edge (2D) or face (3D).
機械的な制約
- Constraint fixed: Used to define a fixed constraint on point/edge/face(s).
- Constraint displacement: Used to define a displacement constraint on point/edge/face(s).
- Constraint plane rotation: Used to define a plane rotation constraint on a planar face.
- Constraint contact: Used to define a contact constraint between two faces.
- Constraint transform: Used to define a transform constraint on a face.
- Constraint force: Used to define a force in [N] applied uniformly to a selectable face in a definable direction.
- Constraint pressure: Used to define a pressure constraint.
- Constraint self weight: Used to define a gravity acceleration acting on a model.
- Constraint bearing: Used to define a bearing constraint.
- Constraint gear: Used to define a gear constraint.
- Constraint pulley: Used to define a pulley constraint.
熱的制約
- Constraint initial temperature: Used to define the initial temperature of a body.
- Constraint heatflux: Used to define a heat flux constraint on a face(s).
- Constraint temperature: Used to define a temperature constraint on a point/edge/face(s).
メニュー:メッシュ
- Nodes set: Creates/defines a node set from FEM mesh.
- FEM mesh to mesh: Convert the surface of a FEM mesh to a mesh.
メニュー:Solve
- Solver Calculix CCX tools: Creates a new solver for this analysis. In most cases the solver is created together with the analysis.
- Solver Elmer: Creates the solver controller for Elmer. It is independent from other solver objects.
- Solver job control: Opens the menu to adjust and start the selected solver.
- Solver run calculation: Runs the selected solver of the active analysis.
メニュー:結果
- Results purge: Deletes the results of the active analysis.
- Result show: Used to display the result of an analysis.
メニュー:ユーティリティ
- FEM Examples: Open the GUI to access FEM examples.
コンテキストメニュー
環境設定
- Preferences...: Preferences available in FEM Tools.
リンク
FEMインストールをクリックすると、動作中のFEMモジュールを設定する方法の詳細が表示されます。
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.
チュートリアル
チュートリアル1 FEM CalculiXカンチレバー3D
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.
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.
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.
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)
- 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
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
- Workbenches: Std Base, Assembly, BIM, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub