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Prediction of Extrusion Pressure in Vortex Extrusion Using a Streamline Approach | ||
| Iranian Journal of Materials Forming | ||
| مقاله 6، دوره 4، شماره 1، تیر 2017، صفحه 52-62 اصل مقاله (723.8 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijmf.2017.4060 | ||
| نویسندگان | ||
| M. Shahbaz* 1؛ J. G. Kim2؛ R. Ebrahimi3؛ H. S. Kim2 | ||
| 1-Department of Materials Science and Engineering, School of Engineering, Urmia University, Urmia, Iran | ||
| 2Department of Materials Science and Engineering, POSTECH, Pohang 790-784, Republic of Korea | ||
| 3Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran | ||
| چکیده | ||
| Vortex extrusion (VE) is a severe plastic deformation technique which is based on the synergies between high strain accumulation and high hydrostatic pressure. Such a high amount of pressure, places a mandate to seek the method for investigation of the load under processing conditions. For this, kinematically admissible velocity field and upper bound terms based on Bezier formulation are developed in order to investigate relative pressure in the VE process. Effects of reduction in area, relative length, twist angle, and friction factor in power dissipation terms are systematically analyzed. It is demonstrated that increasing the twist angle and area reducing and friction factor in the VE process increases the relative pressure, which the rates of these increase varies with twist angle. Moreover, the effect of the relative length is different in various frictional conditions. Results of conventional extrusion (CE) are in good agreement with those found by Avitzur for the effect of slug length and friction factor on the relative extrusion stress. | ||
| کلیدواژهها | ||
| severe plastic deformation؛ Vortex extrusion؛ Bezier formulation؛ Upper bound theorem | ||
| مراجع | ||
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