How to prevent penetration between different parts?

Hi all,

 

I have modeled three parts and then assembled them using Mate. Then I copied the assembled shape several times and mated them together. For this shape, I used fixtures, loading, meshing, and contacts with friction equal to 1. For some reasons, my parts penetrate into each other after simulation. Will appreciate your help in advance! 

 

EhsaSOLIDWORKSpenetrationcontactassemblyparts