Thanks JulianHardy. I calculated the deflection and they are all tangential. That means there is a positive radial deformation at the free end. Should this be the case? I was expecting a pure rotation with no radial expansion on the tube. Thanks.
Good point! Except the actual model has many features that is time consuming to shell it out. I have verified the reaction and stresses and they are OK. I can do a test model with shells to see it does the same thing. Thanks.
Thanks for all the responses. Regarding the BC, the pipe is fully fixed at one end, or cantilevered. The torsional load is applied at free end. I have tried to constrain the outer diameter in radial direction at the free end and still see the "cone" effect in the deformation plot. I think that...
I have a tubular structure model in 3D solid element (CTETRA) in Nastran. The model is fixed at one end. I applied a torque at the another end in two ways: 1) a moment applied on a node at the center of the tube and conect to the top edge of the tube through a RBE2 element; 2) apply a radial...
