Hybrid carbon and glass fiber-reinforced composites have attracted significant research interest for primary load-bearing structural components in the field of aviation manufacturing owing to their low weight and high strength to weight ratio. However, the anisotropic and heterogenic nature of carbon and/or glass fiber-reinforced composite prevents high machining quality due to the directionality effect of fibers in the polymer matrix. As such, this study investigates the effect of drilling process for hybrid fiber-reinforced composite and reports optimal drilling parameters to improve the drill quality. Experimental studies indicate that an increased point angle (i.e., from 80° to 120°) resulted in low delamination upon entry due to reduced thrust force, which in turn produces better surface finish with minimal tool wear. The optimal feed rate (0.2 mm/min) ensures lower delamination at entry, since higher feed rates can increase the thrust force due to elevation in the shear area or raise the self-generated feed angle, which in turn reduces the effective clearance angle. To this end, drilling parameters were optimized using Dandelion optimizer (DO)—a cutting-edge metaheuristic search algorithm (MSA). We report the excellent consistency of DO to solve the proposed drilling optimization problem while achieving promising results as ascertained by the small standard deviation values.

The prime purpose of the current research is to investigate the influence of Intumescent flame retardant (IFR)-Ammonium polyphosphate (APP) on the mechanical properties of Phenolic resin/E-Glass hybrid configurations and suitability of hybrid configuration for battery casing in E-vehicle. Varying weight fractions viz. 2, 4, 6, 8, 10 wt% of APP were used to fabricate -Phenolic resin/E-Glass/APP polymer composites. Tensile, flexural, low velocity impact, and quasi static indentation tests were conducted and analyzed. Among the developed hybrid configurations 6 wt% APP filled laminate shows the better tensile and flexural properties than other configurations. It is understood from low velocity Izod impact test, falling weight impact test and quasi static indentation tests that APP filled hybrid configurations have more energy absorption. 6 wt% APP filled laminate has high deformation in elastic phase and low deformation in plastic phase. Morphology and fracture mechanism of polymer laminates are also presented and discussed. It is concluded from the investigations that E-Glass/Phenolic matrix/APP laminate is found as a potential candidate for battery casings of E-vehicle.

Aluminium plays vital role in the fabrication of aerospace and defence structures due to its convincing properties like low density and chemical resistance through passivation phenomenon. Powder Metallurgy (PM) is acknowledged for its matrix structure control, proper reinforcement dispersion and matrix – particle bonding. The mechanical, tribological and metallurgical properties of aluminium mayremarkablyenhanced by the incorporation of ceramic materials. The intention of this study is to explore the influence of Sic and Al₂O₃ addition on the aluminium composites fabricated through PM technique. In this proposed work Al/Sic and Al/Al₂O₃metal matrix composites (MMC) were fabricated by PM with various weight percentages to compare its mechanical and tribological properties. The experimental results reveals that Al-Sic hybrid configuration shows better mechanical and tribological properties than Al-Al₂O₃ configuration. Similarly, both hybrid composites possess better performance than aluminium base Al 7075.