interfacial fracture

I would like to calculate maxim safe size of delamination in composites using ansys/abacus.

I went through the forums here found that cohesive zone modeling & vcct techniques are being used only in ABACUS. Is it not possible in ANSYS APDL?

If not please can somebody provide me tutorial of ABACUS regarding interfacial cracks. Also which one better VCCT or Cohesive zone modeling for an existing crack.

的问候。