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Contact result in SOL 101 with 2nd order elements - discussion

Phenom
Phenom

To all

 

I need a sanity check/advice in SOL101 with contact. Contact is modelled between a flexible part made of 2nd order elements and a Rigid surface. The aim is to check what is the extend pressure area due to the contact. As I am testing with 2nd order tet element  (the manual does not state that they cannot be used ) I am getting "spotty" results for the contact forces. See attached. Why is that? he forces at the mid-nodes and corner nodes are of opposite sign. ABAQUS has tehe modifed tet10 to overcome some issue

 

On a second issue: Has anyone noticed that the Master Grid Point for the Rigid Surface (RS) is not working as intended in SOL101? My understanding is tha tthe Master Grid Point should be used to control the (rigid body) displacement of the entire surface. I had to put a constraint on  all the nodes (all dofs) on the RS. One also need to mesh the surface as a "topological" surface is not created. Has NX.Nastran not the capabilty of modelling "topological" simple surfaces such as rectangle and arc if rigid?

 

Thanks

 

Regards

 

 

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)
2 REPLIES

Re: Contact result in SOL 101 with 2nd order elements - discussion

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

Please check for not desired interferences & material penetrations between contacting regions, this is the main issue when solving contact problems. ALWAYS use TET10 high order elements, never low order TET4. take a look to my blog wher you will learn to deal with INIPENE contact parameter:

https://iberisa.wordpress.com/2012/01/14/mejora-de-resultados-de-contacto-lineal-con-inipene-en-fema...

 

not desired penetrations

 

initial penetration

 

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: Contact result in SOL 101 with 2nd order elements - discussion

Phenom
Phenom

Thanks for that. Came across your blog a while ago. Issue is not about interference is about understanding the results I am looking at. Why this "spotty" effect.?

Production: NX9.0.3.4, NX10.0.2.6
Development: VB.NET (amateur level !)