Analysis of main failure pattern using discrete Fourier transform on metalepoxy- based adherent-laminates
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Sandwich-structured materials are widely used in science,
industry and consumer products and therefore have to fulfil
several parameters of the designed application, but in particular
mechanical stability. This article focuses on mechanical testing
of composite sandwich-structured laminates, consisting of
metal and epoxy-based adherent. As peel forces denote
enormous strains for adhesives, floating roller method was used to determine the mechanical stability of the laminates.
Besides the peel resistance, the main failure pattern is also of
interest as it has an influence on the long-term stability of the
laminates. Therefore, the curves of mechanical testing were investigated using discrete Fourier transform (DFT) to give an indication of the predominating failure mechanism. The samples themselves were analysed using light microscopy to validate the results of the DFT.