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User Warning Message 4690 (CNTGAPERR) - FEMAP/NASTRAN

User Warning Message 4690 (CNTGAPERR) - FEMAP/NASTRAN

User Warning Message 4690 (CNTGAPERR) - FEMAP/NASTRAN

(OP)
I have noticed that FEMAP reports that the gap between glue faces of some elements in gap pairs are overly large, even when there is no visible gap between the faces in the model. What is the reason for this false error and is there any way to fix it, if the geometry used to create the mesh is already in contact? What is the best way to know if this is actually causing an inaccuracy in the model.

I have only seen this error when connecting edge of shell elements to face of solid elements.

*** USER WARNING MESSAGE 4690 (CNTGAPERR)
The gap between glue faces of some elements in gap pair 22 between
regions 37 and 35 seems overly large. The largest values are listed
in the table below:

ELEMENT ELEMENT GAP

157893 51686 7.65885E-02
157893 52386 7.65885E-02
157882 51730 7.65870E-02
157882 52430 7.65870E-02
157882 51739 6.48329E-02
157882 52439 6.48329E-02
157893 51697 6.48329E-02
157893 52397 6.48329E-02
157883 51724 5.00000E-02
157883 51727 5.00000E-02

RE: User Warning Message 4690 (CNTGAPERR) - FEMAP/NASTRAN

Hello!,
This is a notice message, only informative.
Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/

RE: User Warning Message 4690 (CNTGAPERR) - FEMAP/NASTRAN

(OP)
Thanks Blas. I know it's only a warning, and not a fatal error, but I don't want to write it off as nothing without understanding what is happening. Is it quite normal to have this warning when connecting the edge of a shell structure to the face of a solid? In reality I am not connecting two faces at all, but rather an edge to a face, so the warning is a little strange that the "face" of two elements is far away.

I have viewed the deflected shapes, all connections look to behaving as expected and I have also ran a normal modes eigenvalue solution and I do not see the model "separating" at any of the connection points. I assume these methods of checking are typically adequate to ensure the warning isn't indicative of a real problem.

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