Journal of Science  and Technology of Composites

Journal of Science and Technology of Composites

Study of Damage in Fiber Metal Laminate including Matrix Cracking, Delamination and Plasticity of Metal Layer

Document Type : Research Paper

Authors
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
Abstract
Fiber Metal Laminates are new composite structures in which several thin metal sheets and composite layers are connected together. These structures have properties such as high fatigue resistance, high impact resistance and high energy absorption, which have led to a growing use of them in various industries. In this study, damage in FMLs under tensile static loading, including matrix cracking, delamination induced by matrix cracking and plasticity in metal layers, was examined. Using the analytical model, stress distribution and energy release rate were extracted in FML containing matrix cracking and delamination. Numerical modeling of FML containing such damages was also performed. The stress distribution results obtained from the analytical and numerical models were compared, and good agreement between the results was observed. Furthermore, the FML samples were subjected to tensile test and the damages that occurred in them were displayed. By using the analytical model and calculating energy release rate, the matrix crack saturation and the initiation of delamination at the crack density of 0.38 (the distance between two cracks is 2.7 mm) were extracted. By observing the experimental samples, this crack density was observed in most of the length of the sample, but due to various reasons such as manufacturing defects, in some areas the distance between the cracks was larger than the mentioned value.
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