An Upper Bound Solution for Analysis of Twist Extrusion Process with Elliptical Die Cross-section

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

یاسر میرباقری ¹ , حامد معصومی ² , مجید سیدصالحی ³

1 - مربی، گروه مکانیک، دانشگاه آزاد اسلامی واحد گلپایگان.
2 - مربی، گروه مکانیک، دانشگاه آزاد اسلامی واحد گلپایگان.
3 - دانشجوی دکتری، دانشکده مهندسی مواد، دانشگاه صنعتی شریف.

Received: 2015-09-30 Accepted : 2015-09-30 Published : 2009-12-22

Keywords: Twist extrusion, Velocity field, Upper bound technique, Severe Plastic Deformation,

Abstract :

Twist extrusion process is a rather new route to produce highly strained materials. In this process, severe plastic deformation is applied by large shear strains. In current article, required energy for twist extrusion by use of admissible velocity field together with the upper bound technique is predicted. The proposed model is capable of considering the effect of various parameters such as die geometry and friction conditions. In addition, the model anticipates the critical die design parameters. To verify the proposed model, the predictions were compared with the results of a finite-element analysis and reasonable consistency was observed.

References:

[1]Valiev R.Z., Korznikov A.V., Mulyukov R.R., Structure and properties of ultrafine-grained materials produced by severe plastic deformation, Mater. Sci., A168, 1993, pp.  141–148.

[2]Segal V.M., Equal channel angular extrusion: from macromechanics to structure formation, Mater. Sci. Eng., A271, 1999, pp.  322–333.

[3]Saito Y., Tsuji N., Utsunomiya H., Sakai T., and Hong R.G., Ultra-fine grained bulk aluminum produced by accumulative roll-bonding (ARB) process, Scr. Mater., 39(9), 1998,  pp.1221–1227.

[4]Salishchev G.A., Valiakhmetov O.R., and Galeyev R.M., Formation of submicro crystalline structure in the titanium alloy VT8 and its influence on mechanical properties, J. Mater. Sci., 28,1993, pp.2898–2902.

[5]Su J.Q., Nelson T.W., Sterling C.J., , A new route to bulk nanocrystalline materials, J. Mater. Res., 18, 2003, pp.  1757.

[6]Beygelzimer Y.E., Varyukhin V.N., Synkov V.G., and Synkov S.G., Severe plastic deformations of the materials under twist hydro extrusion, Phys. Technol. High Press., 10(2), 2000, pp. 24.

[7]Ma X., Barnett M.R., and Kim Y.H., , Forward extrusion through steadily rotating conical dies, part II: theoretical analysis, Int. J. Mech. Sci., 46, 2004, pp. 465–489.

[8]Orlov D., Reshetov A., Synkov A., Varyukhin

V.N., Lotsko D., Sirko O., Zakharova N., Sharovsky A., Voropaiev V., Milman Y., and Synkov S.G,  Nanostructured materials by high pressure severe plastic deformation, NATO Sci. Ser. II, Math. Phys. Chem., 2006, pp. 212, 277.

[9]Varyukhin V., Beygelzimer Y., Synkov S., and Orlov D., , Application of twist extrusion, Mater. Sci. Forum, 2006, pp. 503–504,
pp. 335–339.

[10]Seyed Salehi M., Serajzadeh S., A new upper bound solution for analysis of twist extrusion process with elliptical die cross-section, Proc. IMechE Vol. 223 Part C:, J. Mechanical Engineering Science. ,2009.