Finite element analysis of the effect of friction in high pressure torsion

Song, Yuepeng; Wang, Wenke; Gao, Dongsheng; Yoon, Eun Yoo; Lee, Dong Jun; Kim, Hyoung Seop

doi:10.1007/s12540-014-3007-4

Cited by 25 publications

(20 citation statements)

References 33 publications

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“…Song et al [62] performed a more detailed analysis regarding the influence of the friction on the stress-strain distribution during HPT process. The results demonstrated that friction plays a more important role in the torsion stage than in the compression stage.…”

Section: Finite-element Approachesmentioning

confidence: 99%

High‐Pressure Torsion: Experiments and Modeling

Borodachenkova¹,

Wen²,

BastosPereira³

2017

Severe Plastic Deformation Techniques

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Section: Finite-element Approachesmentioning

confidence: 99%

High‐Pressure Torsion: Experiments and Modeling

Borodachenkova¹,

Wen²,

BastosPereira³

2017

Severe Plastic Deformation Techniques

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“…(6): die with a short twist channel, L = 18 mm, and high die angle,  = 51° ("die B", high-angle TE). Furthermore, the FE results presented above were obtained for a perfectly-plastic material only, whereas strain-hardening behavior can also affect deformation during SPD processing as was shown by [10] and [6,11] for equal channel angular pressing (ECAP). For this reason, further analysis was conducted for both perfectly-plastic (PP) and strain-hardening (SH) material models.…”

Section: Distortions and Equivalent Strain Fieldsmentioning

confidence: 99%

Simple shear model of twist extrusion and its deviations

Latypov

Lee²,

Beygelzimer

et al. 2015

Met. Mater. Int.

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Twist extrusion (TE) is a severe plastic deformation method with a potential for commercialization. Advancing TE toward industrial use requires in-depth understanding of deformation during the process and its dependence on processing factors. The helical flow model introduced with the concept of TE provides for a concise description of deformation in the process. To date, however, it was unclear under which conditions the helical flow model yields accurate predictions of deformation in TE. This paper presents a systematic finite-element study performed to identify effects of some key process and material factors on deformation in TE and its departure from the ideal deformation described by the helical flow model. It was found that high strain-hardening rate and friction lead to violations of the assumptions of the helical flow model and that these violations result in departure from the ideal deformation. Deviations from the ideal deformation tend to increase on decreasing the length of the twist channel. Friction effects appear especially critical to be considered for accurate prediction of deformation in TE. Finite-element simulations taking friction into account show good qualitative agreement with earlier marker-insert experiments. The results of the present finite-element study allowed for defining the simple shear model of TE.

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“…(16) In this situation, the surface zone and the die cavity interlock each other and a dead metal zone is created between the central zone and the die surface. The core of the billet passes through the extrusion channel without any deformation as shown in Fig.…”

Section: Upper Bound Solutionmentioning

confidence: 99%

“…Severe plastic deformation (SPD) processing has been employed as an efficient route for the production of bulk ultrafine-and even nano-grained structures in metallic materials [5,6]. In this regard, various methods and techniques are utilized to refine the grain structure by applying large shear strains associated with high hydrostatic pressure, such as equal channel angular pressing (ECAP) [7][8][9][10][11][12], accumulative roll bonding (ARB) [13][14][15], high pressure torsion (HPT) [16][17][18], tubular channel angular pressing [19], caliber rolling [20], and twist extrusion (TE) [1,[21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…In this method shearing plastic strain is applied to billet on surface perpendicular to the extrusion axis. To estimate the required power and deformation pattern during SPD processes several numerical and analytical methods such as the Finite Element Method (FE) [7,16,21,26] and Upper Bound (UB) theorem [27,32] have been employed. In some works, the results obtained from the FEM were used to validate the results of UB analysis of the SPD process [33,34].…”

Section: Introductionmentioning

confidence: 99%

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An upper bound solution for twist extrusion process

2014

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Twist extrusion, a promising severe plastic deformation technique for grain refinement down to ultrafine/ nanocrystalline microstructures, was introduced as an attempt to provide large plastic deformation conditions similar to those in high pressure torsion while allowing large workpiece dimensions for industrial applications. As a relatively new severe plastic deformation technique, twist extrusion requires in-depth investigation of its plastic deformation characteristics. In this study, the twist extrusion process with a square shape die cavity has been analyzed using an upper bound solution to estimate the required power, deformation pattern, and optimum process condition. The analysis has been performed based on two kinematically admissible velocity fields while the effects of friction condition, die geometry, and mean equivalent strain have been considered. The results indicate that the die geometry and process parameters can dramatically change the deformation pattern and extrusion power.

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Finite element analysis of the effect of friction in high pressure torsion

Cited by 25 publications

References 33 publications

High‐Pressure Torsion: Experiments and Modeling

High‐Pressure Torsion: Experiments and Modeling

Simple shear model of twist extrusion and its deviations

An upper bound solution for twist extrusion process

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