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Automated Generation of Tied Node Sets

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Topic starter
Joined: 4 years ago


I want to play around with the *CONSTRAINED_TIED_NODES_FAILURE card in defining failure of a metal plate due to a collision with a rigid sphere. I would like to model the plate using solid elements, but I think the best place to start would be in figuring out how to do this with shell elements.

In looking over the keyword manual, I see that there are several tasks that must be completed, and I'm not sure how to do most of them...

i) Create a mesh in which each element has its own set of nodes so that shared node points have multiple coincident (duplicate) nodes).

ii) Define each of the duplicate nodes as a separate node set.

iii) Create a *CONSTRAINED_TIED_NODES_FAILURE card for each "duplicate node" set. 


I am currently creating all of my Dyna key files in LSPP. I could do this in LSPP by hand for a small-scale problem... maybe with <10 elements... but there must be some automated way to do this for large meshes? Do people created their own programs in some other language (I have spent time working with C++) to generated the necessary key text files?


I suppose in general, I am asking: how do people create the massive number of node/element sets that I have seen in many example key files? 

1 Reply

Negative Volume
Posts: 641
Joined: 5 years ago

Hi @jacob_22

The best way that I know of to create sets in LS-PrePost is through "Create Entity" which is in the Model tab under "Select Part". This may help: