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Article Ultrasonic Vibration-Assisted Machining of Invar 36 Alloy Manufactured by Wire Arc Additive Manufacturing(Elsevier, 2025) Namlu, Ramazan Hakk i; Kucukoztasa, Korcan; Kalkan, Hakan; Kaftanoglu, BilginInvar 36, known for its low coefficient of thermal expansion, is widely used in applications like composite moulds, electronics, and optics. Although Wire Arc Additive Manufacturing (WAAM) offers high deposition rates and cost-effectiveness for Invar 36, it creates rough surface textures requiring machining as post-processing. In order to overcome Invar 36's machinability challenges, Ultrasonic Vibration-Assisted Machining (UVAM) was applied for the first time on WAAM-fabricated Invar 36. The results showed that UVAM outperformed conventional machining in terms of cutting force, surface roughness and topography, subsurface microhardness and tool wear with improvements observed in both building and deposition directions. (c) 2025 CIRP. Published by Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.Article Citation - WoS: 62Citation - Scopus: 67A Mechanistic Approach To Investigate Drilling of Ud-Cfrp Laminates With Pcd Drills(Elsevier, 2014) Karpat, Y.; Bahtiyar, O.; Deger, B.; Kaftanoglu, BilginCarbon fiber reinforced plastics (CFRPs) possess desirable material properties that satisfy the aerospace industry's high strength to weight ratio objective. Therefore, CFRPs are commonly used in structural parts, either alone or together with aluminum and titanium alloys. Drilling of CFRPs has been studied extensively in the literature in recent years, with special emphasis on process parameters and delamination. This study identifies mechanical properties of uni-directional CFRPs through drilling tests. Drilling of uni-directional CFRP plates with and without pilot holes has been performed, and cutting and edge force coefficients are identified. A polycrystalline diamond (PCD) drill was used in tests since this type of drill is commonly used in practice. Finally, validation tests on multi directional CFRP laminates have been performed and good results have been obtained. (C) 2014 CIRP.
