This study investigates the mechanical properties and optimization of hybrid composites composed of flax, vetiver, and mahogany fruit fillers (MFFs) using epoxy resin as the matrix material. Nine distinct composite configurations were fabricated using different MFF concentrations (0, 5, and 10 wt.%) to evaluate their influence on tensile strength, flexural strength, and impact resistance. The MFF was subjected to alkali treatment and characterized using FTIR, XRD, and particle size analysis to enhance its compatibility with the polymer matrix. Vetiver and flax fibers also underwent alkali treatment to improve interfacial bonding. The composite fabrication process followed the Taguchi L9 orthogonal array to optimize the design. Mechanical testing revealed that the incorporation of MFF significantly improved the overall performance, with FVM9 (10 wt.% MFF) exhibiting the highest tensile strength (56.32 MPa), flexural strength (89.65 MPa), and impact resistance (10.46 kJ/m²). The CRITIC–EDAS method was employed to rank the composite configurations, and FVM9 was identified as the optimal configuration. Comparisons with alternative MCDM methods (WASPAS, COPRAS, TOPSIS, and VIKOR) validated the reliability of the rankings, and FVM9 consistently performed the best. The sensitivity analysis demonstrated the robustness of the CRITIC–EDAS approach, as the rankings remained stable despite variations in the criterion weights. The synergistic effect of flax, vetiver, and MFF, along with improved interfacial bonding, contributed to the superior mechanical properties of the hybrid composites. These findings highlight the potential of FVM composites as sustainable, high-performance materials for various industrial applications in the automotive, construction, and aerospace sectors.

This study explores the complex world of mechanical properties displayed by composites reinforced with natural fibers, concentrating on the features of sisal and abaca fibers in particular. This research aims to thoroughly assess the inherent capabilities of these eco-friendly and renewable fibers as strong reinforcing agents in composite materials. The creation of composite samples with carefully adjusted fiber content and matrix compositions is all part of the study technique. A full investigation occurs, diving into essential mechanical qualities such as compression strength, tensile strength, flexural strength, impact resistance, and water absorption. The impact of relative fiber, and the composites were created by blending sisal and abaca fibers in a range of volume fraction ratios (0.0–1.0, 0.25–0.75, 0.50–0.50, 0.75–0.25, and 1.0–0.0). These trials yield data that are carefully examined in order to decipher the complex interactions among fiber type, and overall mechanical performance. The study incorporates advanced microstructural analysis methods, such as scanning electron microscopy (SEM), to reveal subtleties in the complex interfacial bonding dynamics between the natural fibers and the matrix. This research, which goes beyond the usual limitations, illuminates prospective uses for sisal and abaca natural fibers in composite materials while also enhancing our understanding of the mechanical properties.