Hi,
Is there a way to apply a bending moment to a solid element in Ls-PrePost and obtain nodal rotations after running the analysis? I have performed a similar analysis in Abaqus CAE by using rigid body constraint and would like to compare the results with Ls-Dyna.
Sounds like nodout will be your friend, have you tried that yet?
Here is an example from the admin's youtube channel if you haven't seen it: https://www.youtube.com/watch?v=5YmL3Jj5Ihc&ab_channel=UnpopularMechanics
Just a quick question though, it is a deformable solid you're interested in, right?
@sbrrr I tried the suggested approach in the video but keep getting error messages related to massless nodes. Apparently, Ls-Dyna is treating the new node as massless even when it is connected to other independent nodes.
@kingoz79 you probably need to give the new shell part an appropriate section with a thickness (1mm is fine) and *Mat_rigid. Just use whatever material parameters you can from your solid element part for the rigid part. You need to define at least density, young's modulus, and poisson's ratio.
@kingoz79 I believe you can do what you want by creating a separate rigid part with a shell element on the face of the solid element where you want to apply the moment. Make sure the nodes are shared between the solid and shell element. Then you can apply *Load_rigid_body to the rigid part.
Then to get the nodal output you can use nodout like @sbrrr recommended.
This post asked a similar question and might be useful.
https://feassistant.com/forums/ls-dyna/moment-or-force-applied-on-surface-in-ls-dyna/
@negativevolume how do I mesh the shell element so that all the nodes coincide with the nodes on the solid element. I have tried auto mesh without any success. thank you.
Do you have any unreferenced nodes? Those have popped up for me if I deleted elements and forgot removing nodes associated with those deleted elements.
@icebreakersours Thanks, I was able follow all the suggestions provided using a rigid shell element to apply the bending moment to the solid element. Thanks again for the excellent suggestions.
@icebreakersours Hi, do you know the reasons that attribute to "nodes are unreferenced". I don't kown how to solve the problem.