tie nodes together?

[loki3000]

i have two grains that have a 0.00 distance between them and cohesive elements also in-between (two grains do not share nodes so we can't say that this is a rigid connection already). i'd like to delete the coh elements and put a tie between the two elements that are in contact (preferrably between the nodes) -- so that i basically get a rigid part for testing.

how do i do that? i've seen that you can set a tie between two surfaces, but not nodes.

 

[johnhors]

Use constraint equations, one for each nodal degree of freedom that you wish to tie together.

http://www.Roshaz.com

 

[loki3000]

equation such as: node2(x) - node1(x)=0
and so on for x,y,z?