Upper bound and numerical analysis of cyclic expansion extrusion (CEE) process
محل انتشار: فصلنامه مواد پیشرفته و فرآوری، دوره: 5، شماره: 2
سال انتشار: 1396
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 91
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شناسه ملی سند علمی:
JR_JMATPR-5-2_007
تاریخ نمایه سازی: 12 مهر 1400
چکیده مقاله:
Deformation of the material during cyclic expansion extrusion (CEE) is investigated using upper-bound theorem. The analytical approximation of forming loads agrees very well with the FEM results for different amounts of chamber diameter, friction factor and also for lower die angles. However, the difference between analytical and numerical solution increases at higher die angles which are explained by the formation of dead-metal zones at these angles. The results show that the forming load increases at higher friction coefficients, higher chamber diameters and lower amounts of corner fillet radius, but for the die angle there is a maximum value of laod at about ۶۰o. Forming load enhanced by the increase of the die chamber diameter and friction factor. Increasing the die chamber diameter causes to higher strains and, therefore, higher rate of homogenous work. The load decreased slightly by an increase of die corner radius because of the lower and more homogeneous strain distribution in the material.
کلیدواژه ها:
نویسندگان
M. M. Samandari
University of Tehran
S.H.R. Torabi
University of Tehran
Ghader Faraji
Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran