FEM Толщина листовой оболочки
Outdated translations are marked like this.
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| Расположение в меню |
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| Model →Shell plate tickness |
| Верстаки |
| FEM |
| Быстрые клавиши |
| C S |
| Представлено в версии |
| - |
| См. также |
| FEM tutorial |
Описание
ElementGeometry2D используется для определения толщины двумерных элементов МКЭ, всех или лежащих на выбранной поверхности.
2D mesh (on the left) and its expansion to solid elements done internally by CalculiX based on the specified thickness (on the right)
Применение
- There are several ways to invoke the command:
- Press the
Shell Plate Thickness button. - Select the Model → Element Geometry → Shell Plate Thickness option from the menu.
- Press the
- Specify the shell thickness.
- Optionally press the Add button in the task panel and then click on the face you want to have a prescribed thickness. If the face selection is empty, all the remaining faces (whose thickness is not defined by other FEM ElementGeometry2D objects) will be automatically assigned. introduced in 1.1: To remove faces from the selection, press the Remove button.
Ограничения
- Анализ, объединяющий элементы оболочки с твердотельными или краевыми элементами, не поддерживается в текущей версии (FreeCAD 0.18).
Свойства
- ДанныеThickness: Specifies the thickness of the 2D elements.
- ДанныеOffset - introduced in 1.1: Used only by CalculiX. Specifies offset of the shell mid-surface with respect to the meshed geometry. The unit is the shell thickness. Positive values indicate offset in the positive normal direction, negative values indicate offset in the opposite direction. Zero means no offset (mid-surface located on the meshed geometrical surface). For example, 0.5 means that the meshed geometrical surface will be the top surface of the expanded shell, while -0.5 means that it will be the bottom surface.
Offset examples on square plates (view from the side). Each blue line represents the actual geometry for which a 2D shell mesh is generated. The surface mesh is internally expanded to solid elements (green rectangles) by the solver. Offset direction depends on the sign of the specified offset value o and on the surface normal n. Normals in the bottom row were inverted. The offset is measured from the midsurface of the expanded mesh (red dashed line) to the surface of the geometry and 2D mesh (blue solid line) - in this direction indicated by the pink arrows. Thus, as explained above, it follows the normal direction when the offset value is positive and opposes it when the offset value is negative.
Примечания
- For viewing results from CalculiX solver on the mesh expanded to the prescribed thickness, the property
Beam Shell Result Output 3Din the FEM SolverCalculixCcxtools needs to be set toTrue. To just visualize the defined thicknesses before running actual calculations, one may run a check type analysis with this property set toTrue. - This feature uses the *SHELL SECTION card in CalculiX for shell elements and *SOLID SECTION card for plane stress/strain and axisymmetric elements.
FEM
- 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
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