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How can I implement a glued connection between bodies meshed with tet elements?

derek.lewis
I have a model consisting of solid bodies meshed with tetrahedral elements. I intended to use glue connections between the bodies, and run a series of linear static analyses with the resulting model. I get a fatal error when attempting to run the model.
 
I get the following error message, and no amount of changing the connection parameters seem to address it:
 
*** USER FATAL MESSAGE 5 (CNX_BOUDRY)
 Quadratic elements in contact can only be used in combination with BCPARA and IBSEP=1,2,3 or 4
 *** SYSTEM FATAL MESSAGE 4 (MCNTINI)
 *** SYSTEM FATAL MESSAGE An error is encountered in Contact subroutine, cnx_boudry (The return error code is         5)
 
Do I have to coat the tet elements with shells or use parabolic elements only?
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  • 0
    No- you can use what you have... just change the BCPARA IBSEP to 2 or 4... it is set to '0' by default. From the Quick Reference Guide, BCPARA description:
     
    IBSEP Flag for separation based on stresses or forces. (Integer > 0; Default = 0)
     
    0 Separation based on forces.
    1 Separation based on absolute stresses (force/area)
    2 Separation based on absolute stress (extrapolating integration point stresses)
    3 Relative nodal stress (force/area)
    4 Separation based on relative stress (extrapolating integration point stresses)
     
    Only option 2 and 4 can be used with mid-side node elements where the mid-side nodes contact (LINQUAD=-1). For segment to segment contact, the program will set IBSEP to 2 internally. See Remarks 6. and 10.
     
     
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  • 0
    No- you can use what you have... just change the BCPARA IBSEP to 2 or 4... it is set to '0' by default. From the Quick Reference Guide, BCPARA description:
     
    IBSEP Flag for separation based on stresses or forces. (Integer > 0; Default = 0)
     
    0 Separation based on forces.
    1 Separation based on absolute stresses (force/area)
    2 Separation based on absolute stress (extrapolating integration point stresses)
    3 Relative nodal stress (force/area)
    4 Separation based on relative stress (extrapolating integration point stresses)
     
    Only option 2 and 4 can be used with mid-side node elements where the mid-side nodes contact (LINQUAD=-1). For segment to segment contact, the program will set IBSEP to 2 internally. See Remarks 6. and 10.
     
     
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