generative part structural analysis

8/2/2019 Generative Part Structural Analysis

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19972001DASSAULTSYSTEMES

IBM Product Lifecycle Management Solutions / Dassault Systemes

Generative Part Structural

Analysis

IBM Product Lifecycle Management Solutions / Dassault Systemes 19972001DASSAULTSYSTEMES


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Page 2IBM Product Lifecycle Management Solutions / Dassault Systemes

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 V5s associativity features

Duration?45 minutes

Product Coverage

?Assembly Design, Part Design, Generative Part Structural Analysis


Tutorial Objectives



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Tutorial Major StepsHere 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 problemStep 5? Visualise the results

Step 6? Analyse the results

Step 7? Change the design and resolve

Step 8? Reanalyse the results

IBM Product Lifecycle Management Solutions / Dassault Systemes Page 3



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Settings 1/2Depending on your needs, you may have to modify the CATIA V5 settings (units, defaultdirectory, 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\CATSettingsin:

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 forgetto put this folder (CATSettings) inread mode:

? Selectthe folder (CATSettings)

? Click mouse button 3 then click onProperties anduncheck theRead-only Attribute

? Selectall the files in the folder

? Click mouse button 3 then click onProperties and uncheck theRead-onlyAttribute

2. Set them manually:?Launch your CATIA V5 session and do the operations from page 23 onwards

For NT users

For Windows 2000

or XP users

For Windows

98 users


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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.CATMaterialfile under ..\ProgramFiles\Dassault Systemes\M07\intel_a\startup\materials\French directory

? Copy the ..\Getting Started\Catalog.CATMaterialfile under ..\ProgramFiles\Dassault Systemes\M07\intel_a\startup\materials\German directory

? Copy the ..\Getting Started\Catalog.CATMaterialfile under ..\ProgramFiles\Dassault Systemes\M07\intel_a\startup\materials\Japanese directory

? Copy the ..\Getting Started\Catalog.CATMaterialfile under ..\ProgramFiles\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


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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 AssemblyDesign workbench

? If not, select the Product Name inthe Specification tree, then select Start+ Assembly Design

?SelectManipulation icon

?Select Y Translation inManipulationParameterswindow

?Check the With respect to

constraints option box


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Step 1: Show the Supporting Assembly

? In the 3D view, drag the sliding

jaw part along the Y axis (as shownby the yellow arrow) and then drag itback to the original position. Thisshows the assembly mechanism isproperly constrained

?ClickOKto close the Manipulationwindow

?Click on theUpdateicon ifnecessary

? You should not have to do this ifyou are in Automatic Update


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Step 1: Show the Supporting Assembly

?Expand the screw part in thestructure tree by clicking on the +symbol

?Click MB3 on Steel. Then selectProperties to show the materialproperties

?Select Analysis folder to see theStructural Properties of the chosenmaterial

?ClickOKto close the Propertieswindow


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Step 2: Prepare the part for Analysis

?From this assembly you will open the

part and analyse its deformations. In thisCATIA demonstration mode you cannotStudy the Stress Analysis on a fullassembly because this product is not

installed. If you are interested in anassembly evaluation, please contact yourBusiness Partner

? In the Menu bar, select Edit +Links to look at the different partsincluded in that assembly

?Select Pointed documents panel

?Select the ..\Generative PartStructural

Analysis\Data\Screw.CATPart line?Click on the Open button

? The screw will be opened in a newwindow


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?You will simplify the part by deactivatinga redundant pattern at the end of the

screw. (It will not affect the analysisresults.) This operation will savecomputation time.

?Click MB3 on CircPattern.1 in theSpecification tree then selectCircPattern.1 object + Deactivate

?Repeat the operation for

CircPattern.2


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?Now that you have prepared the part to

analyse, you will enter the appropriateworkbench

?From the Menu bar, select Start +

Analysis & Simulation + GenerativeStructural Analysis

? In the New Analysis Case window,select Static Analysis thenOKto

validate? A new window is opened with thescrew in the Analysis environment


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Step 3: Assign Boundary Conditions

Setting the Boundary Conditions

?Before computing, you need to indicatethe Boundary conditions

?SelectClampicon from workbench

?Select one of the internal faces ofthe screw thread (Choose one of thescrew ends)

?SelectOKto confirm


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Step 3: Assign Boundary Conditions

?SelectForceIcon from workbench

?Select the end face of the screw

?Click in the X field and key in 950lbf

?Key-in 50 lbf in the Y field

? The Norm value is automaticallyupdated

?SelectOKto confirm


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Step 4: Solve the problem

Computing the load problem?Setting the Temporary file calculation

?Click on theElfiniStorageLocationicon

?Define the corresponding directory E:\Tempusing Modify

? The results will be stored on your hard disk.You should not need more than 50MB. Todelete the results files, you can either manuallydelete them in Windows or click on the Clearbutton

?Select theComputeicon

?Check the Preview option

?Click on theOKbutton to launch thecalculation

?After a few seconds, CATIA will come backwith an estimated time for computation of thisproblem.

?ClickYesto continue


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Step 5: Visualise the Results

?After computation, the results can bevisualised

? The Von Mises icon is availablewhen the computation is finished

?Click on the black arrow of the

visualisation mode and select theApplies customized view parametersicon

?Check the Materials option

?ClickOKto validate

?Click on theVon Misesicon? Now you can see the Von Misesstress distribution on the deformedmesh model


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Step 5: Visualise the Results

?Visualising the Von Mises image

? To improve your view, hide Propertiesand Nodes and Elements usinghide/show in their contextual menu

?Multi-select both Nodes andElements and Properties in thespecification tree by holding down theCTRL key

?Click MB3 on Properties + Hide/Show

?Move mouse cursor over finite elementsto visualise Von Mises values at eachnode

?You can modify the result display

?Double-click on the palette?Enter 20 instead of 10

?Click OK to close the panel


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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 isometricpredefined view

?Clicking and moving the rotation axis asshown by the yellow arrow

?To translate the cutting plane, clickMB1 on the arc and drag it in thedirection of the yellow arrow

?Uncheck the Show Cutting Planeoption

?Move mouse cursor over finiteelements to visualise Von Misesvalues on each node.


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?

Visualising Von Mises Extrema?Click on the Search Image Extremaicon

?Click OK to validate

? The minimum and maximum Von Misesvalues are displayed directly on thedeformed shape

? You can check that the maximum Von

Mises value is lower than the Steel yieldstrength


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?To get a better idea of the Von Mises

results and deformation, you can animatethis image with a maximum deformationscale factor

?Select Deformation Scale Factor icon

? Increase it to the maximum bydragging the cursor to the end

?Select Animate icon

?Click CLOSE to finish the review

?Deformed mesh image

?Select the Deformation icon


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Step 7: Change the Design and Resolve

?

From the analysed results, youllfindthat the stress is higher than the yieldstrength of steel. To correct this, youneed to modify the part

?Double click part screw on thestructure tree to activate the design

workbench?Double click sketch.3 of shaft.1and change the overall lengthvalue from 6.375 to 9 inches.

?Exit and update if you are not inAutomatic Update mode


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Step 8: Reanalyse the results

?You only need to launch a newcomputation: all FEM specifications areassociative with geometry

?Double click on Finite ElementModel in the specification tree

?Click on theComputeicon to

rerun the compute without preview

?Check the Von Mises stressesby clicking again on theVonMisesicon

? You can check that the

Maximum Von Mises stress is nowless than the yield strength of steel


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Manual Settings




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Setting the environment

Setting the environment?For this exercise you will need to change someOptions

?In the Menu bar, select Tools + Options

?Under General+Parameters, in the Options Pop-

up window, select Units tab

?Select the Length line and with the scrolldown 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

?ClickOKto confirm the settings


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Congratulations

