In this study, micro‐drilling tests were carried out on composite laminates reinforced with hybrid (aramid‐carbon) and carbon fibers. Thrust force, hole quality, tool wear, and temperature parameters were measured and assessed following each drilling test. The quality of holes includes circularity, overcut, hole damage factor (HDF), and taper ratio. Micro‐drilling was performed on a CNC milling machine using 0.6 mm drill diameter, 7500 rpm, and 0.5 mm/min feed parameters. The plates are 3.05 mm (carbon fiber) and 3.45 mm (hybrid) thick. According to the results, the maximum thrust force (29.8 N) was measured in the hybrid composite due to the high fracture toughness of the aramid. In addition, it was determined that the thrust force and drill wear were related. The increase in thrust force during drilling caused an increase in drill wear values. While the average wear of the drill in carbon composite was 0.013 mm, the average wear of the drill in hybrid composite was 0.021 mm. Thrust force and tool temperatures were found to have a similar trend. The highest tool temperature was measured as 86.7°C in the hybrid composite. Hole quality results showed that drilling in carbon composite was more successful than in hybrid composite. Holes drilled in carbon composite have lower values for overcut (0.017 mm), HDF (1.028), and taper ratio (0.008). It has been understood that hole quality depends on thrust force and damage formation.Highlights: Carbon and hybrid (carbon‐aramid) composites were produced with a vacuum infusion process (VIP). Micro‐drilling of composites was investigated focusing on thrust force, tool temperature, and hole quality. Hybrid composites exhibited greater thrust forces due to their higher toughness compared to carbon composites. Hybrid composites showed higher maximum tool temperatures compared to carbon composites. The carbon composites exhibited better hole quality compared to the hybrid composites.

Ecological problems, high cost, and non-renewability of petroleum and its derivatives have increased the research on new sustainable natural products. For this purpose, the physical, chemical, and mechanical properties of Mentha pulegium L. (MPL) fiber, which may have potential for use in textile and composite sectors, were determined by extraction and characterization. Fiber density, length, and diameter were detected by physical tests. Cellulose, hemicellulose, and lignin ratios of the fiber were obtained by chemical analysis and confirmed by Fourier transform infrared (FTIR) spectroscopic analysis. The surface morphology was identified by scanning electron microscopy (SEM) analysis, and the chemical components on the fiber surface were discovered by X-ray photoelectron spectroscopy (XPS) analysis. Thermal degradation values of the fiber were found by thermogravimetric analysis (TGA), and the fiber’s mechanical properties were determined by tensile test. As a result of the tests and analysis, MPL fiber has shown that it has potential for use in textiles and fiber reinforced composites.

Eco-friendly materials receive more attention due to the necessity of addressing pollution and resource depletion in the face of exponential industrial expansion. Natural fibers provide a sustainable substitution, especially in green composites. This study investigated the feasibility of Allium fistulosum L. (Scallion) as a fiber resource for composite applications by using its tassel. Allium fistulosum L. is derived from a widely available plant and its waste tassels of the plant provide fiber properties and have the potential to be a reinforcing component in composites. The investigation involves characterizing Allium fistulosum L. (AfL) fibers through various analyses. The density of the AfL was determined approximately 1.35 – 1.45 g/ cm3. The percentages of lignin, hemicellulose, and cellulose were found to be 24.31%, 29.73%, and 38.36%, respectively. FTIR and XRD analysis affirm AfL's cellulose, hemicellulose, and lignin presence. SEM images indicate a rough surface, necessitating modification for better matrix compatibility. TGA shows suitable thermal stability, majorly degrading beyond 267°C. Tensile testing demonstrates a tensile strength of 22.19 ±3.75 MPa and 0.87 ±0.16 GPa modulus, exceeding some natural fibers like aerial banyan tree roots and Cordia dichotoma. Results show promising features, indicating the viability of AfL fibers in composites with reduced environmental impact and economic benefits.