Optimizing the Tensile and Flexural Properties of Flax/Sisal with SiO2 Nanocomposites Using Response Surface Methodology

This study aimed to examine the impact of fiber orientation on the tensile and flexural strengths of composites composed of Flax and sisal fibers, particularly at orientations of 0, 45, and 90 degrees. Furthermore, the research sought to determine the most effective parameters for the treatment process. The researchers utilized Response Surface Methodology (RSM) in conjunction with Central Composite Designs (CCD) to develop and analyze their studies. The main objective was to enhance crucial variables such as fiber alignment and the proportions of flax and sisal fibers. Quadratic models were employed in this study to forecast the tensile and bending characteristics of the materials. The best tensile strength (TS) was reached by meticulously experimenting with the fiber orientation and altering the amounts of flax and sisal fibers. The most effective parameter was a fiber orientation of 0 degrees, with a combination of flax and sisal fibers at a concentration of 60 percent each. Under these circumstances, the composite exhibited a significant improvement of 35% in tensile strength and 26% in bending strength when compared to the lowest values achieved with RSM optimization. The notable enhancements demonstrate that aligning the fibers can effectively increase the tensile and flexural strength (FS) and strengthen the bonding between natural fibers and polymer matrix structures.