Numerical and physical modelling of plastic deformation in 2-turn equal channel angular extrusion

Rosochowski, Andrzej; Olejnik, Lech

doi:10.1016/s0924-0136(02)00339-4

Cited by 87 publications

(74 citation statements)

References 6 publications

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“…The appearance of a dead zone in the sharp die corner was observed by Rosochowski and Olejnik during modeling ECAE by wax 8 . However the identification of zones where deformation starts and finishes is also a matter of importance, especially for upper bound analysis based on the rigid block model.…”

Section: Physical Modelingmentioning

confidence: 69%

“…Thus friction in the channels is a noticeable factor influencing the total value of ECAE pressure. The appearance of a dead zone in a sharp outer corner of a rectangular ECAE die was assumed in several theoretical models 10,17 and observed in experiments with soft materials like plasticine 22 or wax 8 . From the other side many FEM simulations of ECAP predict rather appearance of gap between deformed billets and die corner [22][23][24] .…”

Section: Comparison With Experimental Data and Fem Modelingmentioning

confidence: 99%

“…Despite the simple design of ECAE tool, the homogeneity of material flow, needed pressure and resulting strains are strongly influenced by a number of process parameters like tool geometry, external friction, rheology of extruded material etc. Therefore the mechanics of ECAE attracts attention of many researchers and was investigated by both theoretical and experimental means [5][6][7][8][9] . The theoretical contributions have been focused on application of the Slip Line Theory 10 , Upper Bound Analysis 5,11-13 , Finite Difference Analysis and Finite Element Modeling 6,14,15 .…”

Section: Introductionmentioning

confidence: 99%

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Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

2013

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In present paper the Equal Channel Angular Extrusion (ECAE) through a rectangular die was firstly physically simulated using plasticine and then theoretically analyzed by upper bound method. Physical simulation was used to identify the deformation zone and as a background for the following theoretical ECAE analysis by rigid block model. The plane strain deformation mode and ideal plasticity of an extruded material were assumed. The dependencies of ECAE pressure, accumulated shear and dimension of a "dead zone" upon friction factor were analytically determined. The rise in ECAE pressure, accumulated shear and size of a "dead zone" with the increase in friction was predicted. The obtained results were compared with the slip line based solution and a good agreement between them was found. Finally the results of upper bound analysis were discussed together with the results of experimental investigations and finite element analysis of ECAE mechanics published elsewhere.

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Section: Physical Modelingmentioning

confidence: 69%

Section: Comparison With Experimental Data and Fem Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

2013

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“…8,9,10,11 The cross section can also be circular or square. The workpiece is machined to fit within the channel and extruded through two intersecting channels with the same cross section using a plunger (Figure 1).…”

Section: Equal Channel Angular Pressing Processmentioning

confidence: 99%

Equal channel angular pressing technique for the formation of ultra-fine grained structures

Sanusi¹,

Makinde²,

Oliver³

2012

S Afr J Sci

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Equal channel angular pressing is one of the techniques in metal forming processes in which an ultra-large plastic strain is imposed on a bulk material in order to make ultra-fine grained and nanocrystalline metals and alloys. The technique is a viable forming procedure to extrude materials by use of specially designed channel dies without substantially changing the geometry by imposing severe plastic deformation. This technique has the potential for high strain rate superplasticity by effective grain refinement to the level of the submicronscale or nanoscale. We review recent work on new trends in equal channel angular pressing techniques and the manufacturing of die-sets used for the processing of metals and alloys. We also experimented on a copper alloy using the equal channel angular pressing technique to examine the microstructural, mechanical and hardness properties of the ultra-fine grained and nanocrystalline materials produced. After deformation, all samples were subjected to a hardness test and the results showed improved mechanical behaviour of the ultra-fine grained copper alloy that was developed. This research provides an opportunity to examine the significance of the equal channel angular pressing process for metals and alloys. That is, these ultra-fine grained materials can be used in the manufacturing of semi-finished products used in the power, aerospace, medical and automotive industries.

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“…The deformation behaviour and strain homogeneity of these processes were also analysed by using finite element simulations. 15,[19][20][21][22][23][24][25][26][27][28][29][30] ECAP has been applied to many materials, such as Al 6000 series alloys 31) and steels. 32) However, very little work has been reported by comparing the deformation behaviour and strain homogeneity of the modified ECAP processes with that of the ECAP.…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics Evaluation of Modified Equal Channel Angular Pressing Processes

et al. 2010

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In current studies, equal channel angular pressing process (ECAP) and modified ECAP processes are simulated under ideal conditions to compare the deformation characteristics. The deformation behaviour is more complicated and the strain induced during the processes is highly non-uniform in the modified ECAP processes except in the equal channel multi-angular pressing (ECMAP) process with Route C. The strain homogeneity is more of a possibility with ECAP and ECMAP with Route C processes. The deformation stress state is widely distributed in nature in modified ECAP processes than in conventional ECAP. In addition, the load requirements are also higher in modified ECAP processes with that of the ECAP process.

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Numerical and physical modelling of plastic deformation in 2-turn equal channel angular extrusion

Cited by 87 publications

References 6 publications

Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

Analysis of equal channel angular extrusion by upper bound method and rigid blocks model

Equal channel angular pressing technique for the formation of ultra-fine grained structures

Deformation Characteristics Evaluation of Modified Equal Channel Angular Pressing Processes

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