The Finite element (FE) method is very effective tool to analyse the phenomena of delamination mechanisms. There are several ways to model delamination: cohesive zone elements, tiebreak contacts, virtual crack closure technique. For most of those methods it is needed special material properties and simulation parameters as energy release rate, contact and fracture parameters, shear, and normal stresses as well as element size. Highly harmful interlaminar shear (ILS) stresses develop at local discontinuities such ply-drops, bonded and bolted joints, or during handling, assembly, or foreign object impact [1]. These stresses need to be evaluated for structural applications, and delamination growth is the fundamental issue in the evaluation of laminated composite systems for durability and damage tolerance.
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