Same Cross Section Different Deformation
I'm curious of the reason for different deformation result with the same cross section.
First of all i used Circular Tube on a 1 m Line Body element and analyzed the tip deflection by applying force.
Secondly, i used the User Defined option and created the same geometry with the same dimensions and got the results.
As it can be seen the figure below, Circular Tube obeys the 'Euler Bernoulli Beam Theory' and User Defined Geometry obeys the 'Timoshenko Beam Theory'.
1-Why does ansys use different theories for the same cross sections?
2-What is the reason of differences between Shear Centers for both section?