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April 11, 2020 12:28 pm
When I set a displacement in the axial direction as a displacement control, the nodes lose the freedom to rotate, no matter if I restrain the lateral DOF of the nodes. I think I have to constrain all nodes of the solid elements to a reference point rather than a node_set to apply the boundary conditions and displacement control using prescribed boundary motion.
But my problem is how to define a reference point in Ls-Dyna? Can anyone give some suggestion to the problem I am facing?
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April 14, 2020 8:36 pm
Hi @sonlong,
I'm not sure what you mean by "constrain all nodes of the solid elements to a reference point"
You are performing a displacement controlled test of some kind in the axial direction but you want to allow the nodes to rotate along the axial axis?