Stick vs Slide contact in SOL101 NX Nastran NX8.5

[amedish]

Hello Everybody,

I have a question regarding sticking and sliding contact in NX Nastran.

I have modeled a preloaded bolted connection between two flanges in SOL101 using BSURF contact regions.

If the external shear force exceed the friction force (given by the bolt preload times the friction coefficient) and slip occur, there is any sense in the results given by Nastran?

I’ve noticed that increasing the values of the penalty factors PENN (up to 1e6) and PENT (up to 1e4) the sliding displacements changes a lot and are similar to the same problem solved with Nonlinear analysis and CGAP elements for the contact. Are these values of PENN and PENT acceptable?

Thank you.

 

[BlasMolero]

Hello!,
PENN and PENT parameters are GLUE contact parameters, nothing to see with NO PENETRATION CONTACT. If you are defining a BOLT PRELOAD study, you must define a SURFACE-TO-SURFACE CONTACT "NO PENETRATION" PROPERTY (BCTPARM) between the contacting faces, additionaly to the bolt preload regions, OK?. In the contact properties you can define the FRICTION parameter, this is the most important value that will affect the contact behaviour of the joint.

Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48004 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

Blog de FEMAP & NX Nastran:

http://iberisa.wordpress.com/