Pretension / Bolt Problems
Hi, everyone!
I hope that you are doing well. I came here because I'm finishing my Mechanical Engineering degree and for my final proyect I have to analyze with FEM a Cubesat 1U. I've already used SimSolid, but now I want to replicate the results on Hypermesh.
I'm encountering a problem that I'm not being able to correct modelling the bolts for the structure. I've already tried with the specifics tools (Fastener), some videos (RBE3 + CBEAM) even I've tried to use the bolt 3D itself as a another component. The mayor problem is when I want to apply a pretension force, having this error:
"*** ERROR # 1309 *** Duplicate SPOINT ID 71593 - it is used on GRID card."
I've found somekind of workarounds but it wasn't helpful at all. Without pretension, the solver gives me a result but it's not realistic because I think it's not transmitting the forces.
Any kind of help would be great.
Answers
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Hello,
When you are applying pretension on a bolt, a scalar point (SPOINT) is automatically created to act as an independent grid point. The specified pretensioning force is internally applied on the SPOINT.
From the error I understand that the ID 71593 is used in both SPOINT and one GRID point in the model. Please, delete the SPOINT and leave the SPNTID in PRETENS card as blank. Optistruct will create a SPOINT automatically and assign a unique ID to it.
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Great! Thank you so much
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Altair Employee