Stella Peloni
Ansys Employee

Hello, 

It would be better the cube and the part of the beam have the same diameter. Additionally, the surfaces which take part in the contacts(target and contact), should have a refined meshing. You could have a better insight on the penetration (except for visual) by using Contact tool in your Solution branch.  In this link, you can find some tips on how to avoid penetration. I think you will find helpful!

Kind Regards,

Stella