Error message with hyperelastic Mooney-Rivlin option

[pilafa]

Hi,

I’m doing some analysis with SOLID186 and the Mooney-Rivlin hyperelastic material option (TB,HYPER,1,,5,MOONEY). I have a tetrahedral mesh. Ansys gives me this error:

‘Error related to regular shapes of 3D elements with mixed u/P formulation, it should never happen.’

By the way, I’ve checked my mesh (ESCHECK) and this one is good (no shape warning or error). Also note that the solution started with a bisection.

Thanks,

Pierre