有限要素法ワークベンチ

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This page is a translated version of the page FEM Module and the translation is 15% complete.

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Workbench FEM.svg

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。

FemWorkbench.jpg

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。

    1. 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。
    2. 分析を作成する。
      1. 幾何モデルのための有限要素メッシュの作成。
      2. 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。
      3. 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。

FEM Workbench workflow.svg

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

  • Fem-analysis.svg 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


  • image is missing Reinforced material: Lets you select reinforced materials consist of a matrix and a reinforcement from the database.

要素の幾何学

Electrostatic Constraints

流体の制約

機械的な制約

  • Fem-constraint-force.svg Constraint force: Used to define a force in [N] applied uniformly to a selectable face in a definable direction.

熱的制約

メニュー:メッシュ

  • Fem-femmesh-create-node-by-poly.svg Nodes set: Creates/defines a node set from FEM mesh.

メニュー:Solve

  • Fem-solver.svg Solver Calculix CCX tools: Creates a new solver for this analysis. In most cases the solver is created together with the analysis.

メニュー:結果

  • Fem-result.svg Result show: Used to display the result of an analysis.

メニュー:ユーティリティ

コンテキストメニュー

環境設定

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

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.