Abstract
ABSTRACT This study investigates the fabrication and performance of single-lap adhesive joints made from functionally graded materials using Fused Deposition Modeling. Functionally graded materials, with their continuous variation in material properties, offer a solution to the common issue of interfacial cracking in composite materials by eliminating discrete interfaces. The adherents used in this study transition gradually between Polylactic Acid and Acrylonitrile Butadiene Styrene, providing enhanced mechanical performance. Five different single-lap joint configurations were tested under tensile loading to evaluate the effect of the graded adherents on joint strength. The experimental results indicate that incorporating Acrylonitrile Butadiene Styrene into Polylactic Acid-based adherents significantly improves both joint strength and ductility. For instance, graded adherents with Acrylonitrile Butadiene Styrene sides adhered together exhibited a 41% greater extension compared to joints made of pure Polylactic Acid adherents. Additionally, the failure mode shifted from adhesive failure in pure material joints to adherent failure in graded joints, demonstrating improved adhesion properties. The findings were further supported by Finite Element analysis, which showed good agreement with the experimental data. The stress distribution analysis revealed effective management of stress concentrations within the graded structures, reducing the likelihood of failure and enhancing joint durability. This research underscores the potential of functionally graded additive manufacturing in optimizing the design and performance of adhesive joints.
Published Version
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