Browsing by Author "Ayten, Ali Imran"

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Effect of Solution-Blown Nanofibrous Web on Quasi-Static Punch Shear Test Results and Quasi-Static Indentation Behavior of Carbon Fiber-Reinforced Epoxy Matrix Composites
(Sage Publications Ltd, 2023) Ayten, Ali Imran; Polat, Yusuf; Sahbaz, Mehmet; Seyhan, Aybeniz
This study investigated the effects of the nanofiber interlayer in carbon fiber-reinforced epoxy matrix composites on quasi-static loading behaviors such as quasi-static punch shear (QS-PST), quasi-static indentation (QSI), and short-beam shear (SBS) loading. The solution-blowing technique was used to produce polyamide-6 (PA6) nanofiber with 1 g/m(2) areal density. A 2x2 twill weave carbon fiber fabric with an areal density of 200 g/m(2) was covered with solution-blown nanofibers. The vacuum-assisted resin transfer molding (VARTM) method was used to manufacture nanofiber interlayered composites and non-interlayered composites. QS-PS experiments were conducted at three different span to punch ratios (SPR), namely 1.1, 2, and 4. The PA6 nanofiber had a synergetic effect on the composite structure. In the QS-PST experiments, it increased the amount of work achieved by the specimen at rates of 29.5%, 13.5%, and 5.66% for SPR 1.1, 2, and 4, respectively while it provided increases in the maximum force at rates of 15.3%, 15%, and 5.7%, respectively. Additionally, the PA6 nanofiber contributed to the composite material properties determined based on the QSI test including the maximum force, punch crush strength, crush stiffness, and through-thickness modulus at rates of 7.5%, 7.56%, 2.72%, and 5.76%, respectively. Finally, an increase at a rate of 11.43% was determined in the SBS strength of the nanofiber interlayered composite, while it showed an increase in maximum force observed during the SBS experiment at a rate of 12.28%. The enhancements of mechanical properties of structural composites make them more reliable for high technology applications like aerospace, and automotive.
Effect of Solution-Blown Polyamide-6 Nanofiber Interlayer on Drilling Performance of Carbon Fiber Reinforced Composites
(Sage Publications Ltd, 2025) Ayten, Ali Imran; Sahbaz, Mehmet; Morkavuk, Sezer; Polat, Yusuf; Seyhan, Aybeniz
This study examines the effect of solution-blown polyamide-6 (PA6) nanofiber interlayers on the drilling performance of carbon fiber reinforced polymer (CFRP) composites. Results demonstrate that PA6 nanofiber interlayers significantly reduce drilling thrust force and improve surface quality. Specifically, at a spindle speed of 1000 r/min and a feed rate of 1500 mm/min, the maximum thrust force was reduced by 17%, from 683.33 N in neat composites to 583.13 N in nanofiber-reinforced composites. At a higher spindle speed of 8000 r/min and a feed rate of 500 mm/min, thrust force decreased by 18%, from 80.22 N to 65.46 N. Surface roughness analysis revealed that nanofiber interlayers reduced Ra values by up to 44%, with a minimum roughness of 0.529 mu m compared to 1.196 mu m in neat composites. Optical and SEM analyses confirmed fewer plucking zones, reduced fiber pull-out, and improved fiber-matrix bonding in nanofiber-reinforced samples, particularly at higher spindle speeds. These findings indicate that PA6 nanofiber interlayers enhance drilling performance, offering reduced machining forces and superior hole quality for precision applications in the aerospace and automotive industries.