Radioss Type7 has a surface "smoothing" function Icurv. Has anyone found this to work for any of the options?

NeilC

I am quite familiar with using Abaqus and this has a very useful option called "geometric smoothing for curved surfaces". Examples below:

 

The effect is to push flat element faces to match the curvature of the curved geometry and align nodes onto the geometric surface, which provides more realistic contact distribution. This in turns yields accurate contact stresses and pressures. Additionally, "node snagging" is eliminated for sliding contact, yielding smoother sliding with smoother tangential friction force and friction heating.

I have experience of Abaqus geometric smoothing working with implicit and explicit solvers, first order and second order tetrahedra and hexahedra solid (continuum) elements.

I have tried Icurv =3 Automatic bicubic surface with version 2019.3 with a ball and raceway bearing model, but the solver rapidly diverges. The Type7 notes say this functionality will be improved in future versions.

Has anyone had any success with Icurv? and if so could they share examples of how it was applied.

PaulAltair

Hi, the Icurv option doesn't currently work very well in most scenarios, I would avoid it until the 'improvement in future versions' comes to pass.

Mathis

Hi NeilC,

According to Radioss documentation, "If I_curv = 3, the master surface shape is obtained with a bicubic interpolation, respecting continuity of the coordinates and the normal from one segment to the other. In case of a fast and large change in curvature, this formulation might become unstable (will be improved in future version)."

So let's say that icurv=3 is in beta mode

 

Anyway, did you try to use Icurv=2? It may be a more mature solution in Radioss.

 

Regards,

Mathis