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ABAQUS-cohesive elements in compression

Hi all,

 I'm not able to understand the behavior of cohesive elements in compression. I had modeled a cohesive surface obeying traction separation between two flat 3D square plates , both of them had unit thickness. I had used the shared nodes technique to edit the mesh of the assembly of the two plates to generate an interface with zero thickness. I tried several loading on the top plates- uniaxial tension, pure shear and uniaxial compression keeping the bottom plate fixed. The model behaves properly in tension and shear, however, in compression the elements of the top plate go inside the bottom plate. I don't understand this behavior of cohesive elements. I think the problem might be that I have missed out some modeling detail or probably I should give additional constitutive behavior to the cohesive elements other than traction separation.

 Please help me with this. Thanks a lot in advance,

Saurabh 

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