I'm having trouble with a multi-step bolt preload. Case 1 works as expected. Case 2 shows the expected displacement behavior, BUT the "beam force end a-x" is unexpectedly compressive when loaded with a negative temp preload.
I'm modeling a clamp assembly with 2 parts and 2 bolts. First the bolt connecting the two parts together is tightened. Then the fastener that closes the clamp is tightened.
I'm using SOL 106 multi-step. Case 1 is a temp preload on the first bolt. Case 2 is the same, but with the second bolt temp load included.
Hi @dferrierQ9L99 . Welcome to the Inventor Nastran forum.
That is an interesting model and the first time I have seen the TEMPRB command.
The displacement results imply that the second bolt is getting shorter, correct? (It is late for me, so I may not be thinking clearly.
) Is it possible that the direction of the bolts are reversed so a + force in one bolt indicates tension while a - force in the other bolt indicates tension? (That's a bit of a stretch, no pun intended, but that's all I have at this hour.)
Another test would be to reverse which bolt is tightened first to confirm that it behaves more as expected.
John
Try this @dferrierQ9L99
John
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