In ANSYS, interface delamination or contact debonding refers to the separation between two materials or surfaces that were initially bonded or in contact. To simulate this phenomenon, you typically use cohesive zone models (CZM) or contact elements with failure criteria.

For cohesive zone modeling, ANSYS allows you to define traction-separation laws to simulate delamination, where the bonding strength between surfaces is progressively reduced as the displacement increases. The interface can fail once the separation reaches a critical value.

In contrast, for contact debonding, you can use contact elements with a frictional contact model and include failure criteria based on normal or tangential stress. Once the specified failure stress is exceeded, the surfaces debond and are allowed to separate.

Both methods require careful setup of material properties, mesh resolution, and boundary conditions to capture the delamination or debonding behavior accurately. ANSYS Workbench or Mechanical APDL provides specific commands and tools, like *CZM or CONTA elements, to manage these simulations.

May be the nodes are properly meshed. verify with all nodes and elements

Yanjie Bai , Bhavanasi Subbaratnam thanks a lot for your answers it helps !

I tried to insert a contact debonding , i initially have a bonded contact between the carbon fiber and epoxy , i've defined a material (fracture energies bases debonding ) since i can't define it with a traction separation law ( it is reserved for the delamination interface ) , however it debond at first , then i have a sliding between the epoxy and carbon ...actually my question is : should i try again to modify the mesh, material properties to have better results or should i give up on contact debonding and try to insert interface delamination ?