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

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

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

(OP)
Hi All,

I have a problem that appeared already here (http://www.eng-tips.com/viewthread.cfm?qid=308700#...).
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

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

(OP)
The problem was NIGeom=off

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