CATIA V5 Generative Part Structural Analysis

Generative Part Structural 

Analysis 

IBM Product Lifecycle Management Solutions / Dassault Systemes 

© 1997 – 2001 DASSAULT SYSTEMES

Tutorial Objectives 

Description 

This Tutorial is an introduction to Generative Part Structural Analysis. 

Message 

To show how Stress Analysis is easy to use - even for the non-analyst 

To show how CATIA V5 gives accurate results 

To show CATIA V5’s associativity features 

Duration 

45 minutes 

Product Coverage 

Assembly Design, Part Design, Generative Part Structural Analysis 


Page 2 


Here are the major steps of the tutorial: 

Step 1 

Show the supporting geometry 

Step 2 

Prepare the part for analysis 

Step 3 

Assign boundary conditions ( Loads and Restraints) 

Step 4 

Solve the problem 

Step 5 

Visualise the results 

Step 6 

Analyse the results 

Step 7 

Change the design and resolve 

Step 8 

Reanalyse the results 

Tutorial Major Steps 


Page 3 


Settings 1/2 

Depending on your needs, you may have to modify the CATIA V5 settings (units, default 

directory, visualisation parameters, etc…) 

In order to use the appropriate settings for this tutorial, you have two possibilities: 

1. Do the following operations (simplest one): 

BEFORE STARTING YOUR CATIA V5 SESSION: 

Copy or replace the directory ..\Generative Part Structural Analysis\Data\CATSettings in: 

For NT users 

For Windows 2000 

or XP users 

For Windows 

98 users 

C:\Winnt\Profiles\XXXXX\Application Data\DassaultSystemes 

C:\Documents and settings\Profiles\XXXXX\Application Data\DassaultSystemes 

C:\Windows\Profiles\XXXXX\Application Data\DassaultSystemes 

XXXX is the name used to log on to your computer 

Do not forget to put this folder (CATSettings) in read mode: 

Select the folder (CATSettings) 

Click mouse button 3 then click on Properties and 

uncheck the Read-only Attribute 

Select all the files in the folder 

Click mouse button 3 then click on Properties and uncheck the Read-only 

Attribute 

2. Set them manually: 

Launch your CATIA V5 session and do the operations from page 23 onwards 


Page 4 


Settings 2/2 

For this tutorial you also need to install a material catalogue: 

Do not do this step if you have already done it in getting started or in a previous tutorial 

Copy the ..\Getting Started\Catalog.CATMaterial file under ..\Program 

Files\Dassault Systemes\M07\intel_a\startup\materials\French directory 


Files\Dassault Systemes\M07\intel_a\startup\materials\German directory 


Files\Dassault Systemes\M07\intel_a\startup\materials\Japanese directory 


Files\Dassault Systemes\M07\intel_a\startup\materials directory 

Answer Yes in order to replace the old catalogue 

You are now ready to launch your CATIA V5 session 


Page 5 


Step 1: Show the Supporting Geometry 

Loading the Product 

Opening the assembly 

Go to File and Open the Drill_ 

Press.CATProduct file in the 

..\Generative Part Structural Analysis\ 

Data directory 

Check you are in the Assembly 

Design workbench 

If not, select the Product Name in 

the Specification tree, then select Start 

+ Assembly Design 

Select Manipulation icon 

Select Y Translation in 

Manipulation Parameters window 

Check the With respect to 

constraints option box 


Page 6 


Step 1: Show the Supporting Assembly 

In the 3D view, drag the “sliding 

jaw” part along the Y axis (as shown 

by the yellow arrow) and then drag it 

back to the original position. This 

shows the assembly mechanism is 

properly constrained 

Click OK to close the Manipulation 

window 

Click on the Update icon if 

necessary 

You should not have to do this if 

you are in Automatic Update 


Page 7 


Step 1: Show the Supporting Assembly 

Expand the screw part in the 

structure tree by clicking on the + 

symbol 

Click MB3 on Steel. Then select 

Properties to show the material 

properties 

Select Analysis folder to see the 

Structural Properties of the chosen 

material 

Click OK to close the Properties 

window 


Page 8 


Step 2: Prepare the part for Analysis 

From this assembly you will open the 

part and analyse its deformations. In this 

CATIA demonstration mode you cannot 

Study the Stress Analysis on a full 

assembly because this product is not 

installed. If you are interested in an 

assembly evaluation, please contact your 

Business Partner 

In the Menu bar, select Edit + 

Links… to look at the different parts 

included in that assembly 

Select Pointed documents panel 

Select the ..\Generative Part 

Structural 

Analysis\Data\Screw.CATPart line 

Click on the Open button 

The screw will be opened in a new 

window 


Page 9 



You will simplify the part by deactivating 

a redundant pattern at the end of the 

screw. (It will not affect the analysis 

results.) This operation will save 

computation time. 

Click MB3 on CircPattern.1 in the 

Specification tree then select 

CircPattern.1 object + Deactivate 

Repeat the operation for 

CircPattern.2 


Page 10 



Now that you have prepared the part to 

analyse, you will enter the appropriate 

workbench 

From the Menu bar, select Start + 

Analysis & Simulation + Generative 

Structural Analysis 

In the New Analysis Case window, 

select Static Analysis then OK to 

validate 

A new window is opened with the 

screw in the Analysis environment 


Page 11 


Step 3: Assign Boundary Conditions 

Setting the Boundary Conditions 

Before computing, you need to indicate 

the Boundary conditions 

Select Clamp icon from workbench 

Select one of the internal faces of 

the screw thread (Choose one of the 

screw ends) 

Select OK to confirm 


Page 12 


Step 3: Assign Boundary Conditions 

Select Force Icon from workbench 

Select the end face of the screw 

Click in the X field and key in 950 

lbf 

Key-in –50 lbf in the Y field 

The Norm value is automatically 

updated 

Select OK to confirm 


Page 13 


Step 4: Solve the problem 

Computing the load problem 

Setting the Temporary file calculation 

Click on the Elfini Storage Location icon 

Define the corresponding directory E:\Temp 

using Modify 

The results will be stored on your hard disk. 

You should not need more than 50MB. To 

delete the results files, you can either manually 

delete them in Windows or click on the Clear 

button 

Select the Compute icon 

Check the Preview option 

Click on the OK button to launch the 

calculation 

After a few seconds, CATIA will come back 

with an estimated time for computation of this 

problem. 

Click Yes to continue 


Page 14 


Step 5: Visualise the Results 

After computation, the results can be 

visualised 

The Von Mises icon is available 

when the computation is finished 

Click on the black arrow of the 

visualisation mode and select the 

Applies customized view parameters 

icon 

Check the Materials option 

Click OK to validate 

Click on the Von Mises icon 

Now you can see the Von Mises 

stress distribution on the deformed 

mesh model 


Page 15 


Step 5: Visualise the Results 

Visualising the Von Mises image 

To improve your view, hide Properties 

and Nodes and Elements using 

hide/show in their contextual menu 

Multi-select both Nodes and 

Elements and Properties in the 

specification tree by holding down the 

CTRL key 

Click MB3 on Properties + Hide/Show 

Move mouse cursor over finite elements 

to visualise Von Mises values at each 

node 

You can modify the result display 

Double-click on the palette 

Enter 20 instead of 10 

Click OK to close the panel 


Page 16 


Step 6: Analyse the Results 

Displaying the cutting plane to see the 

inside part values 

Select the Cut Plane icon 

Select the view under the isometric 

predefined view 

Clicking and moving the rotation axis as 

shown by the yellow arrow 

To translate the cutting plane, click 

MB1 on the arc and drag it in the 

direction of the yellow arrow 

Uncheck the Show Cutting Plane 

option 

Move mouse cursor over finite 

elements to visualise Von Mises 

values on each node. 


Page 17 



Visualising Von Mises Extrema 

Click on the Search Image Extrema 

icon 

Click OK to validate 

The minimum and maximum Von Mises 

values are displayed directly on the 

deformed shape 

You can check that the maximum Von 

Mises value is lower than the Steel yield 

strength 


Page 18 



To get a better idea of the Von Mises 

results and deformation, you can animate 

this image with a maximum deformation 

scale factor 

Select Deformation Scale Factor icon 

Increase it to the maximum by 

dragging the cursor to the end 

Select Animate icon 

Click CLOSE to finish the review 

Deformed mesh image 

Select the Deformation icon 


Page 19 


Step 7: Change the Design and Resolve 

From the analysed results, you’ll find 

that the stress is higher than the yield 

strength of steel. To correct this, you 

need to modify the part 

Double click part screw on the 

structure tree to activate the design 

workbench 

Double click sketch.3 of shaft.1 

and change the overall length 

value from 6.375 to 9 inches. 

Exit and update if you are not in 

Automatic Update mode 


Page 20 


Step 8: Reanalyse the results 

You only need to launch a new 

computation: all FEM specifications are 

associative with geometry 

Double click on Finite Element 

Model in the specification tree 

Click on the Compute icon to 

rerun the compute without preview 

Check the Von Mises stresses 

by clicking again on the Von Mises 

icon 

You can check that the 

Maximum Von Mises stress is now 

less than the yield strength of steel 


Page 21 


Manual Settings 



Setting the environment 

Setting the environment 

For this exercise you will need to change some 

Options 

In the Menu bar, select Tools + Options… 

Under General+Parameters, in the Options Popup 

window, select Units tab 

Select the Length line and with the scroll 

down menu, choose the Inch(in) unit 

On the Force line, select the Pound Force 

(lbf) unit 

Finally on the Pressure line select the Lb. 

force per square inch (psi) unit 

Click OK to confirm the settings 


Page 23 


Congratulations 

IBM IBM Product Lifecycle Management Solutions / / Dassault Systemes 

© 1997 – 2001 DASSAULT SYSTEMES

CATIA V5 Generative Part Structural Analysis

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