Learning Forum

[ngholizadeh]

Hi,

I'm new to LS-DYNA and I'm using LS-PrePost to create models. I've created two 1D elemnts (beams). Beam 1 has two nodes 1 and 11, and beam 2 has two nodes 2 and 22. I want to connect all 3 translational DoFs of node 11 and 22 with a rigid link (in Global or local coordinate system) and connect rotational DoFs of node 11 and 22 with rotational springs (constants for rotational stiffnesses are known). How should I do this in Global coordinate system of whole structure and Local coordinate system of beam element?

 

Thank you.

[Alex R.]

Hello, 

I would suggest creating two new discrete beam elements (ELFORM = 6) with a material MAT_GENERAL_NONLINEAR_6DOF_DISCRETE_BEAM (MAT_119).

The 1st beam element between the nodes 11 and 22 may have very high stiffness (almost rigid) in translational DOF stiffness (LCIDTR, LCIDTS and LCIDTT) thus the nodes should be able to rotate.

The 2nd beam element between the nodes 1 and 2 may have prescribed known rotational DOF stiffness (LCIDRR, LCIDRS, LCIDRT) and very low translational DOF.

Please let me know how it goes,

Thanks,
Alex