Map initial deformation to mesh

Bill_22179

I need to compute the stress in a beam that has plastic deformation. I dont know what are the initial stresses so I need to compute them.

The way I see it is I would mesh the beam (with solid/shell elements) first. Then I would add the deformed geometry to the model. I would then deform the initial mesh so it looks like the deform geometry.

Other than adding spcd to faces/nodes, is there a bette way to do this? Can this be an optimization problem?

 

I can't share pictures but you could imagine a beam fixed at both ends and warped in the middle.

Thanks

Bill_22179

Also, I was thinking on deforming the beam in an explicit subcase and then take the deformed mesh and stresses as a start for the second analysis (nl static) in which I would load the top of the beam. Would it be a better way to do it?

Jason_Craanen

Bill_22179 said:

Also, I was thinking on deforming the beam in an explicit subcase and then take the deformed mesh and stresses as a start for the second analysis (nl static) in which I would load the top of the beam. Would it be a better way to do it?

Bill,

Are you intending on including the initial stress/strain on the model, or just the deformed shape.

You can export the deformed shape directly out of Hyperview as a solver deck.

https://help.altair.com/hwdesktop/hwx/topics/file_management/solver_deck_export_unity_r.htm?zoom_highlight=export

Or you can map displacement results to a model. (attached video)

However, if you want to include the initial stress/strain, you should do a NL continuation step or transient setup.

https://community.altair.com/community/en/nonlinear-transient-analysis-loadcase-setup-tips-and-tricks?id=kb_article&sys_id=0ced06331b69b9d0c4dfdbd9dc4bcbf6

https://community.altair.com/community?id=community_blog&sys_id=538764ab1b3790d4a5f742eddc4bcba4&view_source=searchResult

 

https://help.altair.com/hwsolvers/os/topics/solvers/os/cntnlsub_sub_r.htm?zoom_highlight=CNTNLSUB

Bill_22179

Jason Craanen_20442 said:

Bill,

Are you intending on including the initial stress/strain on the model, or just the deformed shape.

You can export the deformed shape directly out of Hyperview as a solver deck.

https://help.altair.com/hwdesktop/hwx/topics/file_management/solver_deck_export_unity_r.htm?zoom_highlight=export

Or you can map displacement results to a model. (attached video)

However, if you want to include the initial stress/strain, you should do a NL continuation step or transient setup.

https://community.altair.com/community/en/nonlinear-transient-analysis-loadcase-setup-tips-and-tricks?id=kb_article&sys_id=0ced06331b69b9d0c4dfdbd9dc4bcbf6

https://community.altair.com/community?id=community_blog&sys_id=538764ab1b3790d4a5f742eddc4bcba4&view_source=searchResult

 

https://help.altair.com/hwsolvers/os/topics/solvers/os/cntnlsub_sub_r.htm?zoom_highlight=CNTNLSUB

I need to include the deformed shape and the stress/strain.

 

I think I will need to include the result from a previous step.