Tied boundary condition

[jisb007]

Hi,

I met some weired thing: I specified tied boundary condition between two surfaces. Initially, the slave nodes are aligned with the master rigid body surface, but after a while, the nodes are no longer tied, as I can see from the displacement calculations. Can you tell me why? Is there any default value set in abaqus that specifies when the tied boundary condition will be broken? Thanks!

 

[corus]

Tied nodes simply have their degrees of freedom equated to the opposite surface. If the nodes are not in perfect alignment then an interpolation is used between the surfaces. Sometimes a displaced shape that has been factored up to show the distortion can be misleading. Check the values calculated at both surfaces.

corus

 

[mrgoldthorpe]

jisb007,
Did you use the TIED option of *CONTACT PAIR?
MRG

 

[jisb007]

Thanks both!

I am running abaqus V6.4-4 -- *Contact pair, TIED option is no longer supported and suggested to use *TIED option to specify the BC before the history portion of the input file.

I am re-run the model using V6.3-1 now, and this time using *contact pair, tied option. I'll see how it goes and will let you know. Thanks very much!