need help modelling

[rob768]

Hello,

I want to create a model of a radial bearing-like configuration, in which the balls transfer force from inner to outer part (see attached model). I want to do this using connections, and a pie-shaped segment using symmetrie. I can't get this to work due to "bad pivot ratios". Obviously i am struggling with the boundary conditions or the connection definitions.
Anyone got suggestions, or perhaps a link to demo model?

 

[Naffoussi]

How do you constraint your model?

 

[rob768]

I think that was root of the problem. I did some minor modifications and got it to work now. It does seem I can't use contact through connected surfaces in combination with plastic deformation though.
It works the way i want in linear calculations, but not in plastic.

 

[BlasMolero]

Dear Rob,
NX NASTRAN Basic Nonlinear module (SOL106) do not support surface-to-surface constact, you need to use Advanced Nonlinear module (SOL601) in order to estudy problems fully nonlinear with surface-to-surface contact, geometric nonlinearities as large displacements effect and material nonlinearities.
Best regards,
Blas.

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Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
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http://www.iberisa.com

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[rob768]

Dear Blas,

yes, i had understood that as well after contacting the helpdek. Solved the problem by using regular contacts and axis-symmetrie in a cylinderical coorsinate system.

thanks and regards
rob