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

• Published in: Composites science and technology 2009-09, Vol.69 (11), p.1699-1709
• Main Authors: Aymerich, F., Dore, F., Priolo, P.
• Format: Article
• Language: English
• Subjects: Applied sciences; B. Impact behaviour; C. Computational simulation; C. Delamination; Exact sciences and technology; Forms of application and semi-finished materials; Laminates; Polymer industry, paints, wood; Technology of polymers
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2008.10.025

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 ([0 3/90 3]s and [90 3/0 3]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 [0 3/90 3]s and [90 3/0 3]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.