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NX Nastran Surface-to-Surface GLUE contact

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

An option to glue elements together during a solution is available in FEMAP with NX Nastran. Glue Surface-to-Surface is a simple and effective method to join meshes which are dissimilar. It correctly transfers displacement and loads resulting in an accurate strain and stress condition at the interface. The grid points on glued edges and surfaces do not need to be coincident.

 

glue-mesh.png

 

glue-results.png

Glue creates stiff springs or a weld like connection to prevent relative motion in all directions.

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/
3 REPLIES

Re: NX Nastran Surface-to-Surface GLUE contact

Experimenter
Experimenter

Hello Blas,

 

Do you have a source that explains the effect of the "Glue Factor" on the "Define Connection Property" window? Does this correspond to a stiffness? Or a friction value? Do you have any guidance on how to choose an appropriate value for this entry?

 

Thanks!

Re: NX Nastran Surface-to-Surface GLUE contact

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

All is written in NX NASTRAN manuals, simply in FEMAP go to HELP > NX NASTRAN and click in the NX NASTRAN USERS GUIDE, read everything in detail and you will understand the different parameters used with the GLUE contact condition.

glue-nxnastran-manual.png

For instance, writing a post about SURFACE-TO-SURFACE THERMAL COUPLING using GLUE feature of NX NASTRAN was an interesting exercise to "dive" between the different options of GLUE feature, here you are the link: http://www.iberisa.com/soporte/femap/termico/Heat_Transfer_from_Chip_to_PCB.htm

glue_thermal_contact_default_values.png

 

Using GLUETYPE=2 a “weld like” connection will be used to define the connections, where PENGLUE = Penalty factor is used to define the glue penalty stiffness (default=1.0).

  • With PENTYP=1 then PENGLUE is a unitless value (glue stiffness scale factor).
  • With PENTYP=2 then PENGLUE has the units of F/L^^2.

For glued coincident faces, there is little flexibility between the faces with default penalty factors. Regardless of which GLUETYPE is used, the glue condition created between non-coincident faces will not usually produce a local stiffness as accurate as using a conventional finite element for the connection. The flexibility in the glue condition will depend on the GLUETYPE used, and the value of the penalty factors.

PLEASE NOTE: If you have non-coincident faces and the glue joint flexibility is important, then it is recommended that you model this connection with conventional finite elements.

The capabilities of the GLUE condition with NX NASTRAN are impressing, here you are:

glue-conditions.png

Best regards,
Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: NX Nastran Surface-to-Surface GLUE contact

Experimenter
Experimenter
Blas,

You always give such good replies. Thank you!