Generative Part Structural Analysis

Transcription

1 Generative Part Structural Analysis

2 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

3 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

4 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

5 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 Copy the..\getting Started\Catalog.CATMaterial file under..\program Files\Dassault Systemes\M07\intel_a\startup\materials\German directory Copy the..\getting Started\Catalog.CATMaterial file under..\program Files\Dassault Systemes\M07\intel_a\startup\materials\Japanese directory Copy the..\getting Started\Catalog.CATMaterial file under..\program 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

6 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

7 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

8 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

9 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

10 Step 2: Prepare the part for Analysis 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

11 Step 2: Prepare the part for Analysis 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

12 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

13 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

14 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

15 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

16 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

17 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

18 Step 6: Analyse the Results 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

19 Step 6: Analyse the Results 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

20 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 to 9 inches. Exit and update if you are not in Automatic Update mode Page 20

21 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

22 Manual Settings

23 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

24 Congratulations IBM IBM Product Lifecycle Management Solutions / / Dassault Systemes