Effect of geometric parameters on strain, strain inhomogeneity and peak pressure in equal channel angular pressing – A study based on 3D finite element analysis

Patil, Basavaraj V.; Chakkingal, Uday; Kumar, Tanuj

doi:10.1016/j.jmapro.2014.07.010

Cited by 25 publications

(7 citation statements)

References 10 publications

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“…It is clear that the strain is inhomogeneously distributed throughout the sample. This is in line with the previous findings of different researchers investigating the deformation inhomogeneity during ECAP . However, in the case of the die with the choked exit channel, the strain is more inhomogeneousely distributed.…”

Section: Resultssupporting

confidence: 92%

Die Design Modification to Improve Workability during Equal Channel Angular Pressing

et al. 2016

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The effect of choked and relieved configurations of die exit channel on the workability of AA6063 alloy during equal channel angular pressing (ECAP) is investigated. Finite element simulation is used to predict variation in maximum principal stress (s 1 ) to be consequently correlated to the occurrence of surface cracking. Critical regions for fracture are found at the top surface of the sample at which tensile s 1 exists. Tensile stresses are involved when dies with parallel or relieved exit channels are used while the stresses are compressive in case of die with choked exit channel. Choke angle of 0.2 is found as the optimum value guaranteeing compressive s 1 in addition to avoiding significant increase in strain inhomogeneity and pressing pressure. Fig. 7. Effect of choke angle of die exit channel on (a) variation of extrusion pressure and the variation of maximum principal stress at points (b) P1, (c) P2, and (d) P3. M. Torabi et al./Die Design Modification to Improve Workability.

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Section: Resultssupporting

confidence: 92%

Die Design Modification to Improve Workability during Equal Channel Angular Pressing

et al. 2016

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“…For ease of comparison, the ECAP process used in our previous study is shown together [16]. In ECAP, if the specimen is pressed after being inserted into the top inlet of the ECAP mold, it undergoes a high level of shear deformation by passing through a channel with a 90 • bending angle [18][19][20][21][22][23][24][25]. The diameter of the billet was not changed after this process.…”

Section: Processes For Plastic Deformationmentioning

confidence: 99%

Investigation of the Correlation between Initial Microstructure and Critical Current Density of Nb-46.5 wt%Ti Superconducting Material

Moon

Kim

Lee

et al. 2021

Metals

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We have investigated the effect of initial microstructures on the change in critical current density (Jc) of Nb-46.5 wt%Ti (NbTi) superconducting material. It is well known that α-Ti phases distributed in NbTi material act as a flux pinning center, resulting in an improvement in critical current density. Therefore, it is crucial to obtain the grain-refined microstructure, which is strongly related with precipitation of uniformly distributed fine α-Ti phases and higher volume faction of α-Ti phases, as α-Ti phases are precipitated at the grain boundaries and triple points during heat treatments. Therefore, in order to characterize the effect of initial microstructure of NbTi on critical current density, different initial microstructures were obtained by applying equal channel angular pressing (ECAP) and hot rolling with different strains. It was revealed experimentally that hot rolling with a higher strain is efficient for obtaining the initial microstructure, which has equiaxed fine grains of β-NbTi with the aid of dynamic recrystallization, and which is helpful for precipitating fine α-Ti phases during intermediate heat treatment. Furthermore, it was confirmed that critical current density can be enhanced by obtaining a smaller α-Ti phase, a higher aspect ratio of α-Ti phase, a higher volume fraction of α-Ti phase and a ribbon-like folded α-Ti phase.

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“…The pressing force required also may increase with lower angle [9]. Finite element analysis (FEM) has been used for analysis on strain distribution, strain inhomogeneity [10], and the peak pressure required for pressing. In the ECAP process, most of the FEM analysis done to analyse the deformation behaviour and the strain behaviour on the materials [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Finite element analysis (FEM) has been used for analysis on strain distribution, strain inhomogeneity [10], and the peak pressure required for pressing. In the ECAP process, most of the FEM analysis done to analyse the deformation behaviour and the strain behaviour on the materials [9,10]. This includes the effect of friction on the material movement [11], the type of material used [12][13][14], the effect of using back pressure to the process [15], and the strain localisation achieved in the sample under several parameters [16].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Equal Channel Angular Pressing: Effect of Die Angle and Number of Passes

Shri

Hassan

Zahari

et al. 2019

IJAME

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Equal channel angular pressing (ECAP) is one of the popular severe plastic deformation processes used to produce bulk nanostructured materials. The degree of homogeneity of nanostructured is affected by various die parameters. In this paper, the effect of internal die angle (ϕ) and number of passes (N) on the strain behaviour of Aluminium Alloy 6061 (AA6061) during ECAP was investigated by using three-dimensional finite element analysis. The effect of number of passes and die angle on the homogeneity within the workpiece was analysed in terms of contours, radial view contour and inhomogeneity index. The analysis is done by comparing workpiece extruded up to 8 passes at die angle of 120° and 126°. It is observed that the resulting strain is higher at 120° die. However, the inhomogeneity index is decreasing in a similar pattern in both dies. The simulation results shed some lights on the optimum design of ECAP die for homogeneous microstructure.

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Effect of geometric parameters on strain, strain inhomogeneity and peak pressure in equal channel angular pressing – A study based on 3D finite element analysis

Cited by 25 publications

References 10 publications

Die Design Modification to Improve Workability during Equal Channel Angular Pressing

Die Design Modification to Improve Workability during Equal Channel Angular Pressing

Investigation of the Correlation between Initial Microstructure and Critical Current Density of Nb-46.5 wt%Ti Superconducting Material

Finite Element Simulation of Equal Channel Angular Pressing: Effect of Die Angle and Number of Passes

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