Can I define a constraint condition after deformation?

[mtkashani]

thread799-132367

Hi,

I wrote the input file and add the following lines for add and remove the MPC as
** In the model input part of the .inp file:
** Element set forming surface 1, the slave:
*ELSET,ELSET=ESURF1,GENERATE
1 , 100 , 1
** .. or whatever the element are comprising this surface
**
** Elements set forming surface 2, the master:
*ELSET,ELSET=ESURF2,GENERATE
101 , 200 , 1
** .. or whatever the element are comprising this surface
**
** Define the two surfaces:
*SURFACE , TYPE=ELEMENT , NAME=SURF1
ESURF1 ,
*SURFACE , TYPE=ELEMENT , NAME=SURF2
ESURF2 ,
** specifiy how they interact, and the name of the interaction:
*CONTACT PAIR, INTERACTION=INTTIED, ADJUST, TIED
SURF1 , SURF2
*SURFACE INTERACTION , NAME=INTTIED
**
**.. rest of model input
**
** Step 1
** remove the contact in step 1:
*MODEL CHANGE, REMOVE, TYPE=CONTACT PAIR
SURF1 , SURF2
** undertake the rest of the step...
**
** Step 2
** re-activate the contact in step 2:
*MODEL CHANGE, ADD, TYPE=CONTACT PAIR
SURF1 , SURF2
** and continue the step...
**

but I have an error as:
*MODEL CHANGE CANNOT BE USED FOR TIED CONTACT PAIRS

I really appreciate if anybody helps me how can I solve this error