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Extending Midsurfaces?

OK. I've been practising Geometry import and clean up using IGES format because it seems like some of the CAD models we will be receiving in near future will be in IGES.

 

Anyways, I am encountering this a lot and was wondering what to do.

 

01.PNG

 

As can be seen, there is a small gap between the two surfaces. I have tried Midsurface->Intersect and Midsurface->Extend commands but both of them do not yield the desired results. I also even tried extend option from the Geometry section in the Mesh Toolbox. Also tried Midsurface -> Clean Up command as well.

 

Any suggestions on how I can recitfy the above i.e. connect them? Femap does not allow me to perform any parasolid operations such as splitting surfaces using point-edge or point-point option.

3 REPLIES

Re: Extending Midsurfaces?

Hello!,

Command GEOMETRY >SOLID > STITCH is what you need to use, play with TOLERANCE value accordingly.

stitching-command.png

stitch-surfaces-example.png

 

The only inputs required for this command are the surfaces themselves, a stitching tolerance, and whether “mergeable curves” should be cleaned up. The tolerance can be adjusted to facilitate the closing of gaps between surface edges. This is a very useful command when reading trimmed surfaces from an IGES file. You can read an IGES file, and then use this command to generate a Parasolid solid from the IGES surfaces. You can then manipulate this solid just like any other solid you would have created in FEMAP.

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: Extending Midsurfaces?

Hi Blas,

Thx again for your response.

 

Should have been more clearer in my original post. The surfaces I have shown in the picture are Femap generated midsurfaces from the solid which is generated from IGES surfaces using the Stich command.

 

Does the stich command work for Midsurfaces and provide me a stiched surface?

 

 

Re: Extending Midsurfaces?

Yes, no matter surfaces from IGES or surfaces created internally with MIDSURFACE command in FEMAP, unless you have surfaces in T-joint, in this case the Parasolid STITCH command fails. 

Alternatively, activate Combine Midsurfaces in the MIDSURFACE AUTOMATIC command, in this case FEMAP simply performs a Geometry > Surface > NonManifold Add on the newly created midsur­faces in an attempt to create a general body, which usually aids when trying to create a mesh.

midsurface-combine.png

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/