Simulation of multiple delaminations in impacted cross-ply laminates using a finite element model based on cohesive interface elements

AYMERICH, FRANCESCO;Dore F;Priolo P.

2009-01-01

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Abstract

The paper investigates the capability of a finite element model based on cohesive interface elements to simulate complex three-dimensional damage patterns in composite laminates subjected to low-velocity impact. The impact response and the damage process of cross-ply laminated plates with grouped ([03/903]s and [903/03]s) and interspersed ([0/90]3s) ply stacking was simulated using a FE model developed by the authors in a previous study and the numerical results were compared to experimental observations. The model provided a correct simulation of size, shape and location of the principal fracture modes occurring in impacted [03/903]s and [903/03]s laminates. In [0/90]3s laminates, characterized by a complex spatial damage distribution, the model was able to predict the approximately circular shape of the overall projected damage area and to capture the typical shape features of individual delaminations; significant discrepancies between experiments and predictions were however observed in terms of delamination sizes at single interfaces. Further investigations are needed to clarify the main reasons of these discrepancies.