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The MSC/PATRAN FAQ


1. General Questions

Q1.1 : How much disk space do I need?

Minimum of 10 MBytes. Probably about 20 MBytes for medium sized problems. The patran database can be typically 2-3 MBytes in size. In order to compact a patran database which has grown in size 8 to MBytes you would require 8 MBytes of free disk space in your HOME directory. This is because patran makes a backup copy before compacting it. Compact should not be confused with the unix command compress. This command can be used to save disk space if the patran database is not going to be used for a while. Use the unix command uncompress before accessing a compressed database next time.

Free disk space is not required to use the compress command. The compressed files have the extension .Z added to the file name. For example if you have a database called earthquake1.db the compressed file will be called earthquake1.db.Z.


Q1.2 : What finite element analysis modules are available ?

ABAQUS and P3/FEA are available in the teaching system.


Q1.3 : What type of analysis can I do ?

It depends, if using ABAQUS the following solution types are available :

Click on radio button Analysis and in the form select Step Creation.... In the new form look at the Solution Type.

These correspond to the ABAQUS procedures listed below (in alphabetical order) : If using P3/FEA the following options are available.

Click on radio button Analysis and in the form select Solution Type.... In the new form look at the Solution Types available and choose one.

If you are interested in thermal analysis then click on top menu Preference and choose Analysis.... In the new form change the Analysis Type : from structural to thermal. Click on the OK button in that form.

Click on radio button Analysis and in the form select Solution Type.... In the new form look at the Solution Type and the following option should be available.


Q1.4 : What output options (including hard copy) are there ?

The following hard copy options are available :
  1. Colour postscript (A0 to A4 size).
  2. hpgl (A0 to A4 size).
Choose File from the pull-down menu and then Print.... In the new form choose either postscript or HPGL for the driver and then click on Page Setup .... In the new form choose the appropriate Paper Size. Example A4. Then click on OK.

In the original form click on Options ....

If HPGL option has been selected then in the new form

click on Print to File (square button). Click on OK in this form and in the original form click on Apply.

If Postscript had been selected then in the new form

click on Print to File (radio button) if you want to create a postscript file. Click on Create EPS file (radio button) if you want to create an encapsulated postscript file.

If you want to send the postscript plot direct to the plotter leave both these options unset.

Finally click on OK in this form and in the original form click on Apply.

Create eps (encapsulated postscript) output file if you want to include it in latex documents (reports/thesis).


Q1.5 : Can I import the geometry from elsewhere ?

Yes. If the geometry was generated in Pro/Engineer then this data can be transferred directly to Patran.

If the geometry was generated using some other CAD package then the data can be transferred using an IGES file. However be prepared for unpleasant surprises. Lines, surfaces may go missing if you use this option.

In PATRAN one of the example problems demonstrates the importing of an IGES format file.

Choose Help from the top menu and choose Document Library... Select Part 10 : Example Problems. The Example 2 : L-Shaped Bracket illustrates the use of importing a IGES format file. The install_directory is /export/msc/patran8/patran80 ie the IGES file is /export/msc/patran8/patran80/test_files/bracket.igs.

To run this example first copy the above file to the directory from which you are running Patran from.

Choose File from the pull-down menu and then Import.... In the new form change the source from Neutral to IGES.

The IGES format file should be given the extension igs (Example : bracket.igs) and should appear in the list of Neutral Files. Select the appropriate file and click on Apply.

If you want to check how successful the reading of the IGES file was click on IGES Options... in the `import' form. In the new form click on Preview IGES File.... This will bring up the Preview IGES File form. Click on Write to report file and then select the IGES file and click on Apply. Then you can look at the report file and see what information had been successfully read from the IGES file.


Q1.6 : Can I import the f.e.mesh from elsewhere ?

Yes. If the finite element mesh data (nodal co-ordinates, element-nodal connectivity list) is written in the Patran 2.5 neutral file format. See the section 11.2.2 for the Patran 2.5 neutral file format. For example if you have used the DUCT program to create a surface and then meshed it the finite element mesh data is first written out to a file. Then run the duct2pat conversion program which writes the data out in Patran 2.5 neutral file format. This file can then be imported into Patran.

Choose File and then Import.... In the new form object should be Model and the source should be Neutral. Click on the Neutral Options ... and in the new form the heading Entity Packets lists the entities that can be read form the neutral format file. Click on OK in that form.

The Patran 2.5 neutral format file should be given the extension out (Example : bracket.out) and should appear in the list of Neutral Files. Select the appropriate file and click on Apply.


Q1.7 : Can I import a IGES format file ?

Yes. See the answer to question 1.5 above.

Choose File and then Import.... In the new form object should be Model and the source should be IGES. If the source is Neutral then change this to IGES.

Click on the IGES Options ... and in the new form the heading Entity Packets lists the entities that can be read form the IGES format file. Click on OK in that form.

The IGES format file should be given the extension igs (Example : bracket.igs) and should appear in the list of Neutral Files. Select the appropriate file and click on Apply.


Q1.8 : Can I export the f.e. mesh data ?

Yes. You can write out the finite element mesh data in the patran 2.5 neutral format.

Choose File and then Export.... In the new form the format should be Neutral. Click on the Neutral Options ... and in the new form the heading Entity Packets lists the entities that can be written to the neutral format file.

If you are only interested in the finite element mesh data then highlight only the following :

Ensure that for Existing Groups the group which contains the finite element mesh is highlighted. Then click on OK in that form.

In the original form enter a name in the box marked Create New File and give it an extension out. Example plate.out. Then click on Apply.

© Cambridge University Engineering Dept
Information provided by Arul M Britto (amb2)
Last updated: 27 January 2009