Faraj, Mohammed; Carrillo Baeza, Jose Gonzalo; Bele, Eral; (2025) Failure Mechanisms and Strain Distribution in Aramid-Reinforced Aluminium Laminates under Uniaxial Tension. Presented at: Materials Today 2025, Sitges, Spain.

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Abstract

Fibre metal laminates are hybrid materials of fibre-reinforced polymer systems sandwiched between thin metal facesheets. Recently, materials with this configuration have been developed for improved ductility: they can withstand very large uniaxial tensile strains before failure; higher than any of the constituent materials would withstand on their own. This study investigates the strain redistribution and failure mechanisms of Aramid-Reinforced Aluminium Laminates (ARALL) under uniaxial tension. Two fibre orientations, 0/90 and ±45, were investigated to understand how fibre orientation affects uniaxial ductility and mechanical properties. Results indicate that fibre metal laminates with a ±45 fibre orientation exhibited higher ductility compared to the 0/90 configuration, however, the latter exhibited higher ductility than either the aluminium facesheet or composite core. To highlight the reasons for this unexpected phenomenon Digital Image Correlation (DIC) was used to capture strain distribution and localisation in the aluminium alloy facesheets and composite cores. The strain distribution maps showed that there is an interaction between the localised deformation mechanisms that lead to failure in the two phases, resulting in a redistribution of strain that can delay the failure of the least ductile phase. Micro X-ray computed tomography (-XCT) scans were used to observe subsurface failure mechanisms. They showed that failure in both FML configurations was initiated in the aluminium facesheets, however, in the ±45 fibre orientation, this was also accompanied by porosity initiation in the composite core. In all systems, failure propagation and fracture occurred in the aluminium facesheets. These findings underscore the importance of optimising fibre orientation and metal alloy selection to enhance their performance in applications requiring high ductility and strength.

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