#1 2022-08-18 11:07:57

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Properties of a ball element

Greetings dear colleagues,

would you be so kind and point me to documentation on syntax and use cases of ball elements (picture attached).

Thank you so much and best regards.

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EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Re: Properties of a ball element

Hello,

regarding ball element I still haven't found any deeper explanation. Salome defines Radius for this ball element and Code_Aster understands it like 0D Element on node.

So my questions is:
does Code-aster at reading the mesh, reads also the radius properties of this 0D Element (ball element) and how it is used?

In presentation code-aster.org/V2/UPLOAD/DOC/Formations/07-structural_elements.pdf , there is  notation on 1D structural element "ball  joint  rods".

Are those ball  joint  rods just 1D elements like BARRE or CABLE, with 2 "ball joints" at each end unable to add any columb friction at those joint nodes? Or is there some other approach to model "ball joints" with internal friction.?

Temporal solution, since friction at rod ends plays major role in researched phenomenon is as following:
1.  model 2 contact  spheres  at each end of rod and then model rod, since POU_D_T just doesn't cope with moments between spheres and rod or in this case beam.
2.  wotk with CONTACT pnenomenon in nonlinear (DEFI_CONTACT...DYNA or STAT_NON_LINE)
3.  have major fun with convergence issues and calculation speed...

Any suggestions always greatly appreciated.

Regards