Yazar "Yildiz, Yunus Onur" seçeneğine göre listele

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    A new approach to modelling closed cell nanofoams and analysis of their mechanical properties
    (Elsevier, 2022) Yildiz, Yunus Onur
    A new approach which is based on the discreet element method and can be used for modelling closed cell nanofoams is revealed in this study. Atomistic models of closed cell nanofoams with five different types of porosity are generated with the help of a proposed modelling technique in order to examine the role of the porosity. Following the generation of atomistic models, the mechanical behaviour is investigated by performing molecular dynamic analyses. The findings signify that such mechanical properties as elastic moduli, ultimate and yield stresses rise with decreasing porosity for both loading types. Additionally, dislocation extraction algorithm (DXA) analysis is carried out to observe the evolution of the deformation mechanism of atomistic models. Dislocation analyses show that the Shockley partial dislocation plays a huge role in the deformation mechanism.
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    Morphological evolution of irregularly shaped Au nanoparticles during the sintering process and their mechanical performance
    (Springer Int Publ Ag, 2023) Yildiz, Yunus Onur
    This paper's main aim is to improve the understanding of the sintering process. For this purpose, the irregularly-shaped nanoparticles were generated by using a new generation algorithm. Following the generation of atomistic models, different sintering scenarios were carried out to discover the best way of the sintering process for molecular dynamic simulations. Meanwhile, the morphological evolution of irregularly-shaped gold (Au) nanoparticles was examined during the different sintering scenarios. Additionally, adaptive common neighbor analysis (aCNA) is carried out to observe the evolution of the morphology of atomistic models. Moreover, the mechanical behaviour was investigated by using molecular dynamic analyses.
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    Radiation shielding properties of the doped carbon fiber-reinforced epoxy composites
    (Pergamon-Elsevier Science Ltd, 2023) Erdem, Serkan; Bulut, Fatih; Ozcan, Mehmet Erbil; Ogul, Hasan; Yildiz, Yunus Onur
    In this study, the linear attenuation coefficients of the doped carbon fiber-reinforced epoxy composites (Boron Oxide (B2O3), Lead Monoxide (PbO) and Zinc Borate (2ZnO 3B2O3 3H2O)) for the gamma radiation are inves-tigated with the help of the High Purity Germanium (HPGe) Detector. The doped carbon fiber-reinforced epoxy composites were prepared with different proportions of additive materials (10, 20, and 30 wt%) so that impact of the additive amount on radiation shielding could be properly analysed. The specimens were tested at 7 different energy levels ranging from 82.0 to 1332.0 keV with the use of HPGe detector. Further on, the effect of additive materials on mechanical properties was also examined. Findings indicate that all additives into composite ma-terials improve the gamma attenuation ability, and the best gamma shielding characteristic is obtained in the case of 30 wt% Lead Monoxide sample. On the other hand, 10 wt% additive materials provide increase in stiffness compared with undoped samples.