FEM tutorial/ru: Difference between revisions
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===== Netgen ===== |
===== Netgen ===== |
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# Select the model |
# Select the model |
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# Click [[Image: |
# Click [[Image:FEM_Analysis.png|32px]] [[Fem Analysis|New mechanical analysis]] from the menu to create an analysis from the object that was selected |
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# In the meshing dialog, click '''OK''' |
# In the meshing dialog, click '''OK''' |
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# Hide the mesh from the Tree View. |
# Hide the mesh from the Tree View. |
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# Show the original model |
# Show the original model |
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# Select [[Image: |
# Select [[Image:FEM_FixedConstraint.png|32px]] [[Fem_ConstraintFixed|Create FEM fixed constraint]] |
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# Select the back face of the Cube (face on the '''YZ''' axis) and click OK |
# Select the back face of the Cube (face on the '''YZ''' axis) and click OK |
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# Select [[Image: |
# Select [[Image:FEM_ForceConstraint.png|32px]] [[Fem_ConstraintForce|Create FEM force constraint]] |
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# Select the front face of the Cube (the face parallel to the back face) and set the '''Area load''' value to 9000000.00 |
# Select the front face of the Cube (the face parallel to the back face) and set the '''Area load''' value to 9000000.00 |
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# Set the '''Direction''' to '''-Z''' by selecting one of the face edges parallel to that direction. |
# Set the '''Direction''' to '''-Z''' by selecting one of the face edges parallel to that direction. |
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==== Final preparations ==== |
==== Final preparations ==== |
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# Select [[Image: |
# Select [[Image:FEM_Material.png|32px]] [[Fem_MechanicalMaterial|Mechanical material...]] and choose Calculix as the material |
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# Click '''OK''' |
# Click '''OK''' |
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==== Running the Solver ==== |
==== Running the Solver ==== |
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===== Standard Procedure ===== |
===== Standard Procedure ===== |
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# Select the solver object [[Image: |
# Select the solver object [[Image:FEM_Solver.png|32px]] contained in the '''Mechanical Analysis''' |
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# Select [[Image: |
# Select [[Image:FEM_Calculation.png|32px]] [[Fem_ControlSolver|Start calculation]] from the menu |
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# Select '''Write Calculix Input File''' |
# Select '''Write Calculix Input File''' |
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# Select '''Run Calculix''' |
# Select '''Run Calculix''' |
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===== Quick Procedure ===== |
===== Quick Procedure ===== |
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# Select the solver object [[Image: |
# Select the solver object [[Image:FEM_Solver.png|32px]] contained in the '''Mechanical Analysis''' |
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# Click on [[Image: |
# Click on [[Image:FEM_RunCalculiXccx.png|32px]] [[Fem_RunSolver|Quick Analysis]]. |
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==== Analyzing Results ==== |
==== Analyzing Results ==== |
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# From the '''Object Tree''', select the '''Results''' object |
# From the '''Object Tree''', select the '''Results''' object |
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# Select [[Image: |
# Select [[Image:FEM_ShowResult.png|32px]] [[Fem_ShowResult|Show result]] |
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# Choose among the different Result types to view the results |
# Choose among the different Result types to view the results |
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# The slider at the bottom can be used to alter the mesh visualization. This allows us to visualize the deformation experienced by the object, keep in mind that this is an approximation. |
# The slider at the bottom can be used to alter the mesh visualization. This allows us to visualize the deformation experienced by the object, keep in mind that this is an approximation. |
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# To remove the results select [[Image: |
# To remove the results select [[Image:FEM_PurgeResults.png|32px]] [[Fem_PurgeResults|Purge results]] |
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{{Note|Comparison to previous example file|If you select the '''Z diplacement''' result type, you can see that the obtained value is almos identical to the test example provided by FreeCAD. Differences may occur due to the quality of the mesh and the number of nodes it possesses.}} |
{{Note|Comparison to previous example file|If you select the '''Z diplacement''' result type, you can see that the obtained value is almos identical to the test example provided by FreeCAD. Differences may occur due to the quality of the mesh and the number of nodes it possesses.}} |
Revision as of 22:28, 4 August 2016
Руководство |
Тема |
---|
Анализ методом конечных элементов |
Уровень |
Новичок |
Время для завершения |
10 минут + время работы Решателя |
Авторы |
Drei |
FreeCAD версия |
0.16 и выше |
Примеры файлов |
Смотрите также |
None |
Введение
Это руководство предназначено для того чтобы ознакомить с основными принципами работы с FEM Верстаком, а также большинством доступных инструментов для статического анализа.
Требования
- Версия FreeCAD 0.16 и выше
- Netgen и/или GMSH установленные в вашей системе
- В случаем когда используется GMSH, рекомендуется установить psicofil's макросы
- Calculix установленный в вашей системе
- Читатель должен обладать базовыми понятиями о том как использовать Верстаки Part и PartDesign
Последовательность действий
Моделирование
В этом примере в качестве объекта исследования используется Куб, но также вместо него могут быть использованы модели созданные в Верстаках Part или PartDesign.
- Create a new document
- Activate the Part Workbench
- Create a Cube
- Change its Dimensions to the following:
- Height: 1.000 mm
- Length: 8.000 mm
- Width: 1.000 mm
Теперь у нас есть модель с которой можно работать.
Creating the Analysis
Netgen
- Select the model
- Click New mechanical analysis from the menu to create an analysis from the object that was selected
- In the meshing dialog, click OK
Вы также можете, в Tree View, перетащить сетку в Mechanical Analysis у которого нет сетки.
GMSH
Макросы от psicofil's - строго рекомендуются и используется в данном примере.
- Активировать макрос
- Выберете объект который вы хотите использовать, в нашем случае это Куб
- Выберете пункт Create Mechanical Analysis from mesh
- Кликните OK
Теперь когда мы создали сетку для нашего объекта, мы готовы добавить к нему ограничения и действующие силы
Constraints and Forces
- Hide the mesh from the Tree View.
- Show the original model
- Select Create FEM fixed constraint
- Select the back face of the Cube (face on the YZ axis) and click OK
- Select Create FEM force constraint
- Select the front face of the Cube (the face parallel to the back face) and set the Area load value to 9000000.00
- Set the Direction to -Z by selecting one of the face edges parallel to that direction.
- Click OK
Теперь мы установили существующие ограничения и силы для нашего статического анализа.
Final preparations
- Select Mechanical material... and choose Calculix as the material
- Click OK
Running the Solver
Standard Procedure
- Select the solver object contained in the Mechanical Analysis
- Select Start calculation from the menu
- Select Write Calculix Input File
- Select Run Calculix
- Click Close
Quick Procedure
- Select the solver object contained in the Mechanical Analysis
- Click on Quick Analysis.
Analyzing Results
- From the Object Tree, select the Results object
- Select Show result
- Choose among the different Result types to view the results
- The slider at the bottom can be used to alter the mesh visualization. This allows us to visualize the deformation experienced by the object, keep in mind that this is an approximation.
- To remove the results select Purge results
If you select the Z diplacement result type, you can see that the obtained value is almos identical to the test example provided by FreeCAD. Differences may occur due to the quality of the mesh and the number of nodes it possesses.
Теперь мы закончили с основными принципами работы FEM Module.