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A rude error in *.f06 file in nastran analysis.

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Payaroshd

Mechanical
Dec 28, 2019
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Hi.
Urgent help please.!
I prepared fem model for 3d geometry od one assembly parts whicth connet togeather by bolts and revites.in model. From complicated of shape's parts i have been forced automesh by tetra4 element entires of model and used mpc(rbe2) for connect parts togeather after this when i analtised model by statin sol. I see a list of grid in *.f06 file whicth have neative value in T1 or T2 or T3 or R1, R2 or R3 dof in matrix. I copy- paste these grids id to patran file and modify these in connect by rbe2 dofs.Despite this, in the re-analysis of the number of other nodes( new grid id fault) that have the same problem.Where is the problem.?
Why not all the troubled nodes do not show up at one time in one analysis.
Thank you for anyone to guide me.

 
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