Exterior and interior points while creating superelements

noravivian.yazdandoostkhosravi over 3 years ago

I create Superelements by using the groupe function in Patran. After creating a groupe I make a superelement out of it in the element section. For the analyse I use the superelements as PART elements. The analyse with Nastran interrupt because of this:

*** USER FATAL MESSAGE 6591 (SEP2RP)

RBE2 ELEMENT 25000011, SUPERELEMENT 3, DEFINES DEPENDENT EXTERIOR POINTS.

USER INFORMATION: The dependent points must be interior to the superelement.

How can I change an element in Patran to an interior?

0 Sanjay Patel over 3 years ago

Hi Noravivian,

Be sure that dependent point is not on the SE boundary. Boundary/exterior points become part of the A-Set and can not be specified as dependent (M-set) in rbe.

Thanks,

Sanjay.
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0 noravivian.yazdandoostkhosravi over 3 years ago

Hey

how do I make sure this point is not on the SE boundary?

At the moment I generate the Analyse Deck. After that I open the bdf file. All my RBE2 Elementes are in the residual structure. The msc support told me because of an bug I need to write the RBE2 by myself into the super element section. So I copy the line, look to which Grid Point (GN) the element belongs and in which super element the GN is defined. In this super element I file the RBE2 in.

With wich command can I change my exterior into an interior point in the bdf file?

The structure of the super element section looks like this in the moment:

$ Superelement Name: S3

BEGIN SUPER = 3

$ Direct Text Input for Bulk Data

PARAM PRTMAXIM YES

EIGRL 1 10 0

$ Elements and Element Properties

$ Referenced Material Records

$ Description of Material :

$ Multipoint Constraints of Group : G3

$ Nodes of Group : G3

$ Loads for Load Case : Default

$ Referenced Coordinate Frames
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