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2D CFD description of the kinematic effects of movable inlet and outlet die wall transport motion and punch shape geometry on the dynamics of viscous flow during ECAE through Segal 2θ-dies for a range of channel angles

1 Manufacturing Processes and Automation Engineering Department, Donbass State Engineering Academy, Shkadinova Str., 72, Kramatorsk, Ukraine, 84313
2 Department of Water Supply, Water Disposal and Water Resources Protection, Donbass National Academy of Civil Engineering and Architecture, Lazo Str., 14, Kramatorsk, Ukraine, 84333

Topical Section: Materials Processing

Minimization of the dead zone (DZA) in the process of material forming is a materials science problem. Geometric and kinematic approaches to the minimization of the DZA during Equal Channel Angular Extrusion (ECAE) have been proposed, developed, analyzed, and documented. The present article is focused on a 2D Computational Fluid Dynamics (CFD) description of the kinematic effects of punch shape geometry and inlet (IDW) and outlet (ODW) die wall motion on the DZA during ECAE of Viscous Incompressible Continuum (VIC) through a Segal 2θ-die for a range of channel angles 60° ≤ 2θ ≤ 135°. Due attention has been given to the independent alternating transport motions of the IDW and ODW. Punch shape geometry and the kinematic modes of IDW and ODW motions for DZA minimization have been determined with a numerical solution of the boundary value problem for the Navier-Stokes equations in curl transfer form for VIC. Experimental verification was accomplished with an introduction of initial circular gridlines-based physical simulation techniques. For the first time, experimental verification of CFD-derived results was made through an additional superposition of empirically-derived digital photos with deformed elliptical gridlines in the channel intersection deformation zones and correspondent 2D numerical plots with CFD-derived flow lines and full flow velocities. An empirical DZA localization was experimentally determined as the location of minimally-deformed near circular markers. The computational DZA localization was numerically determined as a flow-lines-free zone (the first hypothesis) or as a zone with near-zero values of full flow velocities (the second hypothesis). The relative DZA was estimated as a ratio of the measured DZA with respect to the area of the deformation zone in the channel intersection region. A good agreement was obtained between DZA values obtained with the first hypothesis and experimental results.
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References

1. Beloshenko VA, Voznyak YV, Reshidova IY, et al. (2013) Equal-channel angular extrusion of polymers. J Polym Res 20: 322.    

2. Chijiiwa K, Hatamura Y, Hasegawa N (1981) Characteristics of plasticine used in the simulation of slab in rolling and continuous casting. T Iron Steel I Jpn 21: 178–186.    

3. Koutcheryaev BV (2000) Modeling of continual flows in angular domains, in: Lowe TC, Valiev RZ, Investigations and Applications of Severe Plastic Deformation, NATO Science Series (Series 3. High Technology), Dordrecht: Springer, 80: 37–42.

4. Kucheryaev BV (2006) Mekhanika sploshnykh sred (teoreticheskie osnovy obrabotki davleniem kompozitnykh metallov s zadachami i resheniiami, primerami i uprazhneniiami) [Continuum mechanics (Theoretical principles of the pressure treatment of composite metals with problems and solutions, examples and exercises)], 2 Eds., Moscow: MISiS (in Russian).

5. Laptev AM, Perig AV, Vyal OY (2014) Analysis of equal channel angular extrusion by upper bound method and rigid blocks model. Mater Res-Ibero-Am J 17: 359–366.

6. Minakowski P (2014) Fluid model of crystal plasticity: numerical simulations of 2-turn equal channel angular extrusion. Technische Mechanik 34: 213–221.

7. Nejadseyfi O, Shokuhfar A, Azimi A (2015) Improving homogeneity of ultrafine-grained/nanostructured materials produced by ECAP using a bevel-edge punch. J Mater Sci 50: 1513–1522.    

8. Nejadseyfi O, Shokuhfar A, Sadeghi S (2016) Feasibility of attaining uniform grain structure and enhanced ductility in aluminum alloy by employing a beveled punch in equal-channel angular pressing. Mat Sci Eng A-Struct 651: 461–466.    

9. Oswald P (2009) Rheophysics: The deformation and flow of matter, New York: Cambridge University Press.

10. Perig AV, Laptev AM, Golodenko NN, et al. (2010) Equal channel angular extrusion of soft solids. Mat Sci Eng A-Struct 527: 3769–3776.    

11. Perig AV, Zhbankov IG, Palamarchuk VA (2013) Effect of die radii on material waste during equal channel angular extrusion. Mater Manuf Process 28: 910–915.

12. Perig AV, Zhbankov IG, Matveyev IA, et al. (2013) Shape effect of angular die external wall on strain unevenness during equal channel angular extrusion. Mater Manuf Process 28: 916–922.

13. Perig AV, Laptev AM (2014) Study of ECAE mechanics by upper bound rigid block model with two degrees of freedom. J Braz Soc Mech Sci 36: 469–476.    

14. Perig AV, Golodenko NN (2014) CFD simulation of ECAE through a multiple-angle die with a movable inlet wall. Chem Eng Commun 201: 1221–1239.    

15. Perig AV, Golodenko NN (2014) CFD 2D simulation of viscous flow during ECAE through a rectangular die with parallel slants. Int J Adv Manuf Tech 74: 943–962.    

16. Perig AV (2014) 2D upper bound analysis of ECAE through 2θ-dies for a range of channel angles. Mater Res-Ibero-Am J 17: 1226–1237.

17. Perig AV, Tarasov AF, Zhbankov IG, et al. (2015) Effect of 2θ-punch shape on material waste during ECAE through a 2θ-die. Mater Manuf Process 30: 222–231.    

18. Perig AV, Golodenko NN (2015) ECAP process improvement based on the design of rational inclined punch shapes for the acute-angled Segal 2θ-dies: CFD 2-D description of dead zone reduction. Mech Sci 6: 41–49.    

19. Perig A (2015) Two-parameter rigid block approach to upper bound analysis of equal channel angular extrusion through a Segal 2θ-die. Mater Res-Ibero-Am J 18: 628–638.

20. Perig AV, Golodenko NN (2016) CFD 2D description of local flow of polymer workpiece through a modified U-shaped die during equal channel multiple angular extrusion. Mater Res-Ibero-Am J 19: 602–610.

21. Perig AV, Golodenko NN (2016) Effect of workpiece viscosity on strain unevenness during equal channel angular extrusion: CFD 2D solution of Navier-Stokes equations for the physical variables 'flow velocities–punching pressure'. Mater Res Express 3: 115301.    

22. Perig AV, Golodenko NN (2017) Effects of material rheology and die walls translational motions on the dynamics of viscous flow during equal channel angular extrusion through a Segal 2θ-die: CFD 2D solution of a curl transfer equation. Adv Mater Sci Eng 2017: 7015282.

23. Perig AV, Galan IS (2017) The experimental verification of the known flow line models describing local flow during ECAE (ECAP). Lett Mater 7: 209–217.    

24. Popov VL, Slyadnikov EE (1995) Plastic distortion vortices in solids under intense external action. Tech Phys Lett+ 21: 81–82.

25. Rejaeian M, Aghaie-Khafri M (2014) Study of ECAP based on stream function. Mech Mater 76: 27–34.    

26. Roache PJ (1976) Computational Fluid Dynamics, Albuquerque: Hermosa Publishers.

27. Sofuoglu H, Rasty J (2000) Flow behavior of Plasticine used in physical modeling of metal forming processes. Tribol Int 33: 523–529.    

28. Tabatabaei SA, Abrinia K, Tabatabaei SM, et al. (2015) Analytical modeling of the extrusion process using the electrostatics concept. Mech Mater 88: 87–102.    

29. Tóth LS, Massion RA, Germain L, et al. (2004) Analysis of texture evolution in equal channel angular extrusion of copper using a new flow field. Acta Mater 52: 1885–1898.    

30. Wei K, Liu P, Ma Z, et al. (2015) An upper bound analysis of T-shaped equal channel angular pressing. Acta Metall Slovaca 21: 4–12.

Copyright Info: © 2017, Alexander V. Perig, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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