Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 1Citation - Scopus: 1Reliability Assessment of Structures With Bayesian Model Updating Accelerated Via Polynomial-Chaos Metamodeling(Taylor & Francis Ltd, 2025) Uzun, Ertugrul Turker; Hizal, Caglayan; Aktas, EnginFinite element models are often preferred in numerical modeling of structures, but model assumptions lead to inaccuracies and uncertainties. Measuring these is necessary to determine the reliability and accuracy of the numerical model. This has led to the development of FE model update methods that aim to calibrate the numerical model based on data obtained by structural health monitoring (SHM). However, a general framework that provides a realistic life cycle performance assessment of structures by efficiently incorporating monitored data into structural identification has not yet been impeccably presented. Bayesian modeling can characterize uncertain structural parameters as random variables and provide a systematic methodology for integrating a probabilistic SHM framework into model updating. Unfortunately, these lead to complex and time-consuming, causing limitations in their application. Metamodeling techniques which are effective stochastic predictors can be used to decrease the computational burden in the model updating. This study aims at adapting Polynomial-Chaos-Kriging metamodeling technique integrate to Bayesian model updating process to overcome the computational difficulties and reduce different source of uncertainty with using SHM, then, make more accurate reliability assessment. Therefore, an experimental study is used to assess reliability of structure that is exposed to different types of corrosion effects.Review Citation - WoS: 14Citation - Scopus: 16Advancing Titanium-Based Surfaces Via Micro-Arc Oxidation With Solid Substance Incorporation: a Systematic Review(Elsevier, 2024) Ogur, Ezgi; Alves, Alexandra C.; Toptan, FatihDespite possessing numerous superior properties, titanium, and its alloys exhibit inadequacies in terms of tribocorrosion, bioactivity, and antimicrobial characteristics. In recent years, there has been a rapid increase in research focusing on micro-arc oxidation (MAO) surface treatments to enhance these properties. In the traditional MAO approach, researchers commonly investigate the introduction of additional functionalities to the surface through ion doping. However, over the past decade, studies have indicated that the inclusion of solid substances, either as substitutes for or in conjunction with ion doping, can provide further advantages in terms of multifunctionality. Therefore, this review comprehensively and systematically examines the characteristics of solid substances used during MAO, their incorporation mechanisms, and their influence on resulting biological and degradation behaviors, as well as properties such as photocatalytic activity, magnetic features, hightemperature oxidation resistance, electrical insulation, and thermal shock resistance. This review showed that the integration of solid substances during MAO represents a promising avenue for achieving multifunctional surface enhancements in titanium and its alloys. This review highlights the diverse range of properties and behaviors influenced by these solid substances, offering insights for future research and applications in the field of surface engineering and biomaterials science.Article Citation - WoS: 1Citation - Scopus: 1Influence of Processing Method of Cocrmo Dental Alloy on the Corrosion Behavior in Artificial Saliva(Wiley, 2022) Pontes, Joana R.; Pinto, Ana M. P.; Ariza, Edith; Alves, Alexandra C.; Toptan, FatihRemovable or fixed dental frameworks are usually made of CoCr alloys. The CoCr dental alloys are produced traditionally by lost-wax casting. However, alternative processing routes, such as hot-pressing, are being studied for dental applications. The purpose of the present work was to assess the corrosion resistance of CoCrMo dental alloy produced by conventional lost-wax casting and hot-pressing. The corrosion behavior was studied in artificial saliva at 37°C by potentiodynamic polarisation tests. Immersion tests were performed to evaluate the growth of the passive film where electrochemical impedance spectroscopy was used at different immersion periods. Results showed slightly better corrosion resistance in terms of ipass for CoCrMo samples obtained by hot-pressing. On the other hand, the immersion tests showed a more stable and thicker passive film formed on hot-pressed CoCrMo dental alloy, pointing out that hot-pressing may be considered a promising technique to produce CoCrMo dental structures.Article Citation - WoS: 6Citation - Scopus: 8Effect of the Combination of Organic Acid Solutions on Tinplate Corrosion(Elsevier, 2022) Yıldırım, Koray; Kızılkaya, Ali CanTinplate corrosion as a result of canned food is typically tested in industry by tinplate in synthetic media based on single organic acids. However, the combination of organic acids, which is present in applied conditions, is not previously investigated in terms of its effect on tinplate corrosion mechanism. In this manuscript, we combine structural characterization of tinplate surfaces with electrochemical measurements, to investigate the corrosion mechanism of tinplate under acetic acid-NaCl, citric acid-NaCl, and a combined acetic acid, citric acid and NaCl media. The results show that the combined acid media causes does not result in a pronounced formation of a protective passivation layer, in contrast to the single acid based media. Our findings demonstrate the combined effects of the organic acids in corrosive media has to be taken into account for tinplate corrosion, as they can alter the corrosion mechanism. Furthermore, we show that combination of organic acids can accelerate tinplate corrosion testing in packaging industry. Thus, our findings can contribute to the design of new aging media for tinplate corrosion testing.