How to obtain internal MPC coefficients of NASTRAN RBE3?

[carlomontec]

Hello everybody,

I kindly request your help regarding some NASTRAN here...

Do somebody knows if there is a way of displaying the coefficients of the internal MPCs of an NASTRAN RBE3?

I was assigned to research how to replicate an analysis procedure in ANSYS from the NASTRAN procedure these guys have here.

In the process I was forced to investigate how the RBE3 works. Fortunately, I found a document which includes as an appendix the MSC Technical Note: "Mathematical Specification of the Modern RBE3 Element" which I included in the attachments. (page 159). In this document, it is included the process to calculate the coefficients of the MPCs that NASTRAN use to build the RBE3.

I want to understand the proceduce described here, and I want to compare my script based on this document against a real RBE3.

I've seen that DMAP can be used as:

ALTER 102$
TRNSP GM/GMT $
MATGPR GPL,USET,SIL,CMT//MIN $

Unfortunately I don't know what this all codes mean


I have MSC Nastran 2007.

Thank you for your help.

Carlo

 

[rb1957]

can't open your link ... get "file not found" from Eng-Tips.

not sure what you mean by "coefficients of RBE3".

for DMAP explanation, i'd look into the NASTRAN manuals. have you considered asking the "helpdesk" ? i've found them usually quite helpful.

 

[cloa]

After you try that, if you have more questions try the NASTRAN subforum.