generative part structural analysis fundamentalsyvonet.florent.free.fr/serveur/cours catia/catia...

CATIA Training

COPYRIGHT DASSAULT SYSTEMES Version 5 Release 19 September 2008 EDU-CAT-EN-GPF-FS-V5R19

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Generative Part Structural Analysis Fundamentals Detailed Steps

COPYRIGHT DASSAULT SYSTEMES 2

TTaabbllee ooff CCoonntteennttss Recap Exercises ..................................................................................................................................... 3�

1. Pre-Processing Recap Exercise...................................................................................................... 3�2. Computation Recap Exercise.......................................................................................................... 7�3. Results Visualization Recap Exercise ............................................................................................. 9�4. Refinement Recap Exercise.......................................................................................................... 13�5. Results Management Recap Exercise .......................................................................................... 14�

Master Exercise: Static Analysis ........................................................................................................... 16�1. Creation and Pre-Processing ........................................................................................................ 16�2. Computing ..................................................................................................................................... 22�3. Results Visualization ..................................................................................................................... 25�

Generative Part Structural Analysis Fundamentals� ��


Recap Exercises

1. Pre-Processing Recap Exercise

Load CAT_GPF_pre-processing_recap_exercise.CATPart Under "Generative Shape Design" workbench:

• Click on the "Apply Material" icon • Apply "Aluminum"

Under the GPS workbench:

• Double-click

• Set a size of 10mm, a SAG of 1mm ans check Parabolic element types. Click on Ok

• Click on the clamp icon

• Select this surface:



• Click on Ok

1.1 - You will now define the sliders restraint

• Click on the surface slider icon

• Select the surface

• Click on Ok



1.2 - Loads:

• Click on the distributed force icon

• Select inner surface of the right hole



• Apply –3000N on Z direction • Click on Ok

Below is what you should obtain:

In this exercise, you have seen how to apply two types of restraints and one load on a part. You should now be able to manage the other fundamental pre-processing tools

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2. Computation Recap Exercise

Load: computation_recap_exercise.CATAnalysis

• Click on the "External Storage" icon • Click on "Modify" and specify the folder

• Click on Ok

• Click on the "computation" icon • Click on Ok

• You will receive the warning ‘Rotation Constraints were not taken into account as mesh part is 3D’. Click OK on the Warnings dialog box.

• Click on "YES"

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3. Results Visualization Recap Exercise

Load Results_Visualization_recap_exercise.CATAnalysis

• Click on the "Von Mises Stress" icon

• In the specification tree, double-click on "Von Mises Stress"

• The image edition dialog box appears:

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• Change the types of VISU to get familiar with them. • Click on Ok

• Click on the displacement icon

• Double-Click on "Translational Displacement Vector" in the specification tree

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• The image edition dialog box appears:

• Select "average-ISO" and click on Ok • In the tree, right-click on Von Mises Stress

• Activate it

• Click on the Images Layout icon

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• Click on Ok • Both results are displayed in the same time

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4. Refinement Recap Exercise

Load Results_Refinement_recap_exercise.CATAnalysis

• Double-click on The dialog box below appears:

• Enter a size of: 7mm • Absolute SAG: 1mm • Check the option "parabolic"

• Click on Ok and compute with ‘Mesh Only’ option.

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5. Results Management Recap Exercise

Load Results_Management_Recap_Exercise.CATAnalysis

• Display the Von Mises Stress image

• Click on the "Image Extrema" icon

• Check the "Global" option. • Ask for 2 Max. extrema • Click on Ok

• Display the displacements

• Click on the "Image Extrema" icon • Ask for 1 Max. ext. detection

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• Click on Ok

•

• Click on

• Define a folder • Check Add Created Images and click on Ok

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Master Exercise: Static Analysis

1. Creation and Pre-Processing

Load the CATIA document "catgps_hanger.CATPart"

1.1 - Apply Aluminium to the part

The hanger part is opened in the Part Design Workbench.Apply Aluminium to the part while in the Part Design Workbench.

• Click on the Apply Material icon in the Apply Material toolbar.

• In the Metal tab, click on the Aluminum icon.

• Click on Part representation in specification tree The material will be applied to the part.

• Click OK

• Check that the material is correctly applied to the part.

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1.3 - Open the GPS Workbench and create a Static Analysis of the Hanger.

• Select Static Analysis and click on OK.

At this step, you should have something like this:

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It is time now to apply restraints on the hanger: Clamps to the smallest inner surfaces of both mounting holes

• Click on Clamp icon in Restrain toolbar.

• Select the inner surfaces of the first and second mounting holes. Click on OK.

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1.4 - Now you will apply a load to the inner surface of the foot peg-mounting hole

• Click on the Distributed Force icon in the Loads toolbar.

• Select the footpeg mounting hole.

• Enter the force vector components.

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• Click on OK.

1.5 - Now, you will save the Part and the Analysis Documents in separate folders.

• Click on Save Management… in the File menu.

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• Save the Part • Save the CATAnalysis document in a different folder under:

CATGPS_Hanger_1.CATAnalysis

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2. Computing

Load the previous CATIA Document or "catgps_hanger_step2.CATAnalysis"

2.1 - First of all you have to specify Temporary External Storage location.

• Click on Temporary External Storage icon in the Solver Tools toolbar. • Select a directory with enough space to make the computation.

• In the features tree, double-click on the Computations link and define a directory where the computation files will be saved

• Select a path and click on OK to validate.

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• In the specification tree, double-click on the Results link and define a directory where the results files will be saved

• Select a path and click on OK to validate.

2.2 - At this step, you have defined the different storage locations. Now, you can compute your analysis

• Click on the Compute icon

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The Compute dialog box appears: • Select the "All" option.

• Click on OK.

Wait while computing

Here is what you should obtain:

At this step, you computed successfully the analysis. The step (3) will consist in visualizing the results.

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3. Results Visualization

Load the previous CATIA Document or “catgps_Hanger_2.CATAnalysis” Before you trust in the results, it is important to evaluate their relevance. Consequently, the first thing to do is to check the estimated local error.

3.1 - You will create a Precision image

• Click on Precision icon in the Image toolbar

• A symbol is created in the specification tree:

3.2 - Now you will ask CATIA to localize the error extrema

• Click on the ‘Image Extrema’ icon in the Analysis Tools toolbar • Request maximum of 2 absolute values and click on OK

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Here is what you should obtain:

• You can see that the search of extrema appears below the ‘estimated local error’

Now that you have localized the maximal error, you need to evaluate it

• Click on the ‘Image Information’ icon • Select the ‘Estimated local error’ in the specification tree

The Information dialog box is displayed:

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You can see that the Global error rate is about 27%! That is really too much. You need to improve the results by refining the mesh.

3.3 - You will now create a Von Mises Stress image

• Click on the Von Mises Stress icon

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3.4 - You will try to determinate what is the Max. stress in your hanger

• Click on the Image Extrema icon

• Request a maximum of 2 global maximum values.

• Select the Von Mises Stress in the tree:

You obtain:

The extrema features appear in tree.

You can read that the max. Stress is about 6.2e7Pa. The aluminum yield strength is 9.5 .107 N/m2 (see Information box above) You could conclude that the hanger would not plastically deform under these conditions However, you need more accurate results to make sure.

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You will create reactions tensors on restraints.

3.5 - Create a new sensor by right clicking on sensors.1 in the tree and select Create Resultant Sensor > Reaction Sensor.

• Select Clamp.1 from the Restraints • Click on Update Results.

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Make the sum of external loads and reactions tensors. Check that you obtain a null result

• Click OK The clamp reactions appear in the tree:

• Double-click on the Reaction Sensor to have its tensor.

Note: If you have created two clamps individually, you have to make this for each one

3.6 - You can now publish a report of this first coarse analysis.

• Click on the Generate Report icon in the Analysis Results toolbar

• Specify a report directory and report title.

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• Click on OK

At this step, you know how to:

• Evaluate the global error of an analysis

• Visualize results

• Define sensors

• Publish a report