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RISS 인기검색어
- 검색키워드
- 저자 : Yasin Sarikavak (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Yasin Sarikavak,Can Cogun 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"In this study, single discharge thermo-electrical model of workpiece material removal in electrical discharge machining (EDM) was developed. Developed model includes generation of energy in liquid media, variation of plasma channel radius and transfer of heat from the channel by the electrical discharge. Effect of generated energy in plasma channel on workpiece removal was theoretically investigated by using different experimental parameters used in literature. The developed model finds the temperature distribution in the workpiece material using finite element solver ANSYS Workbench (v.11) software. It’s assumed that the workpiece material reaches the melting point of workpiece material was removed from the surface. Electrical discharge process was simulated by using transient thermal analysis. The developed model has also been validated by comparing the theoretically obtained material removal values with the experimental ones."
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Dynamic wheel/rail interactions for highspeed trains on a ballasted track
Yasin Sarikavak,Koichi Goda 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Measurements of the wheel/rail contact forces are important for evaluating the dynamic behaviour and train running safety. Static and dynamic wheel loads at higher speeds are the key parameters for designing sustainable and reliable railway systems. In this study, the dynamic wheel/rail interactions of high-speed trains are evaluated. Actual static and dynamic field measurements were made for better understanding the case for speeds over 200 km/h. The field measurements were carried out on the ballasted track of a high-speed train line for vertical impact load. For the field studies, pre-calibrated wheel impact load detectors were placed on sleepers under the rail foot to analyse dynamic vertical average and vertical peak forces of high-speed trains under service conditions. The field data measurements were also compared and investigated with the theoretical results calculated using the numerical equations suggested in the literature. Finally, field data were used as an input parameter for the developed finite element model (FEM) to analyse the stress distribution along the rail profile.
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Abdulkadir Kilic,Yasin Sarikavak 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5
Rail transportation systems constantly developing as a result of the increase in demand both in high-speed and freight operations globally. According to this demand and the increase in operational frequency the components fail rapidly. To extend the service life it is desired to develop high strength materials for the critical components of the rail systems. Therefore, in this study, isothermal transformation applied to extracted high carbon rail steels in order to obtain bainitic microstructure under various boundary conditions which shows superior mechanical properties. The experimental studies were conducted under varying austenitizing temperature, transformation time and temperature. The change in microstructure results with improved mechanical properties where combined high tensile strength and toughness values were obtained. Optical and SEM micrograph, XRD analysis and mechanical tests (hardness, impact, tensile tests) were carried out to clarify characteristics of the developed materials. The optimum combination of boundary conditions was obtained by using the analysis of signal to noise (S/N) ratio. In conclusion developed rail steels show better mechanical properties than conventional ones by 21 % in hardness, 16 % in tensile strength, 40 % in elongation and optimum parameters for heat treatment processes are clarified with Taguchi-based grey relational analysis.
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