rotation/torsion deforms the object? nodes move tangentially instead of circularly??

[szcygan]

Hi All,

I have a problem that appeared already here (

http://www.eng-tips.com/viewthread.cfm?qid=308700#post).

Those answers aren't really useful. As I see it - displacement vectors of nodes are calculated in initial position and than nodes are displaced along straight line instead of along a circular one. What's more interesting - even huge deformation of actual elements results in negligible strain values!! This is nonsense, but I can not make it work the right way.

I'm getting the same for: tetraheadral, hexaheadral, standard, explicit, rotation BC / momentum load applied to a reference point (for rigid body constraint, coupling etc).

help!
Szymon

 

[szcygan]

The problem was NIGeom=off