Browsing by Author "Bilen, M. B."

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Effect of Hydrochloric Acid Corrosion and CFRP Coating on the Buckling Behavior of Cylindrical Shells Under External Pressure
(Sharif University of Technology, 2022) Aydin, A. C.; Bilen, M. B.; Maali, M.
Thin-walled cylindrical shells are widely used as silos, liquid tanks, marine structures, and industrial chemical plants. In such applications, the shells are mostly exposed to liquids. Corrosion occurs on surfaces when shells are filled with low-pH liquids. Corroded material loss decreases the thickness of the shells which in turn lessens their buckling capacity. The current study primarily aims to investigate the effects of corrosion on the buckling capacity of thin-walled cylindrical shells subjected to uniform external pressure. The model shells were half- or full-filled with 5% and 10% HCl (Hydrochloric Acid) solutions for corrosion. In order to attenuate the negative effects of corrosion, the cylinders were coated with varying sizes of Carbon Fiber-Reinforced Polymer (CFRP) sheets. A total of 12 models of 800 x 400 x 0:45 mm in dimension were investigated in this research. The perfect non-corroded models were employed to compare the behavior of all models under study. The obtained results indicated that corrosion would cause a significant decrease in the buckling capacity of thin-walled cylindrical shells. It should be noted that the acid ratio, filling rate, and surface area coated with CFRP fabrics considerably affected the buckling capacity of cylinders. To be specific, coating the cylinders with one layer of CFRP moderated the buckling capacity loss. (c) 2022 Sharif University of Technology. All rights reserved.
Web Hole Diameter Optimization for Enhancing Bending Capacity of Steel Beams: Experimental and Numerical Analysis
(Springer India, 2025) Sadid, M. S.; Cinar, N.; Maali, M.; Yaman, Z.; Bilen, M. B.; Sahin, F. Z.; Maali, M.
This study examines the flexural behavior of cellular beams in the context of the size and placement of web openings. Cellular beams are widely used in construction due to their advantages such as weight reduction and versatility. However, the diameter and spacing of web openings significantly impact the flexural capacity of these beams. Therefore, the flexural behavior of steel beams with various web opening diameters and spacings was investigated using both experimental and numerical methods. In the experimental work, four-point bending tests were conducted on steel beams with three different web opening diameters (137 mm, 148 mm, and 160 mm) and various spacing configurations. The numerical analyses were performed using nonlinear finite element analysis in ABAQUS software. The numerical models were validated against experimental results and subsequently utilized in a parametric study. The results showed that increasing the web opening diameter reduced the flexural capacity by up to 64%, while wider spacing increased it by 10-20%. Additionally, when the ratio of beam height to web opening diameter is 1.75, the beam exhibits the highest load capacity and the lowest energy absorption loss. These findings underscore the importance of optimizing web opening configurations in the design of steel structures, both in practical and theoretical terms. The study highlights the need for future research to refine current design codes and integrate new technologies to achieve more efficient designs.