Analysis and modelling by finite element method of the equal channel angular extrusion pressure

Luri, R.; Pérez, C.J. Luis

doi:10.1243/09544054jem1713

Cited by 6 publications

(9 citation statements)

References 27 publications

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“…[10][11][12] On the other hand, since TCP is relatively a new process, the effect of die geometry in this process has not yet been studied. Regarding so, the aim of this work is to study the effect of die geometry on the deformation behavior of tube during TCP.…”

Section: Introductionmentioning

confidence: 99%

“…As shown before, the die geometry can affect the SPD processes extensively and the improper die geometry results to different difficulties such as the strain inhomogeneity and the fracture during SPD process. [10][11][12] On the other hand, since TCP is relatively a new process, the effect of die geometry in this process has not yet been studied. Regarding so, the aim of this work is to study the effect of die geometry on the deformation behavior of tube during TCP.…”

Section: Introductionmentioning

confidence: 99%

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The effects of die geometry in tube channel pressing: Severe plastic deformation

Farshidi

Kazeminezhad

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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The effects of die geometry on the deformation behavior of aluminum 6061 alloy tube in a novel severe plastic deformation (SPD) process called tube channel pressing (TCP) were studied using the Abaqus 6.10 software. Using the optimized die geometry, 1 to 3 passes of TCP is imposed not only to validate the simulation results, but also to investigate the performance of TCP as a SPD process. The finite element method (FEM) simulation results show that the moderated plastic strain, the lower inhomogeneity in distribution of plastic strain, and the lower risk of fracture during process can be obtained using the proper die geometry. In addition, the imposed strain is a mixture of shear strain and hoop strain accompanying with little bending strain which makes it relatively different from conventional SPD processes. Experiments shows that the experimentally obtained load-displacement curve of TCP is very close to its FEM predicted counterpart which validates the FEM simulation results. Additionally, after imposing of 3 passes of TCP to 6061 alloy, the grain size of the tube is decreased from a few tens of microns to less than 1 mm while the yield strength is increased from 110 MPa to 325 MPa which show the capability of TCP as a SPD process for tubes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of die geometry in tube channel pressing: Severe plastic deformation

Farshidi

Kazeminezhad

2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…ECAP is carried out by pressing a billet of material through a die having two equal area channels intersecting at a particular angle. 1,5 –9 The billet experiences simple but very high shear deformation without undergoing changes in its cross section on the route through the die with the added advantage that the process can also be repeated several times.…”

Section: Introductionmentioning

confidence: 99%

“…In sum, most studies have focused on the mechanical properties, microstructure, and deformation behavior of Al-6061 produced via ECAP processing. 1,4 –9,16 –21,28,29 Also, many studies have investigated the properties of machined aluminum. 13,22,23,25 –27 However, it is essential to determine the machinability of the specimens required for forming and shaping UFG bulk materials produced by ECAP for specific applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and machinability of 6061 aluminum alloy produced by equal-channel angular pressing

Asl

Meratian

Emamikhah

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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Equal-channel angular pressing is a process used for the effective improvement of certain mechanical properties of various metallic alloys by producing an ultrafine-grained microstructure, although subsequent machining may be necessary in some cases for practical applications. The objective of this article was to investigate the mechanical properties and machinability of a 6061-T6 aluminum alloy produced by equal-channel angular pressing on different routes. Equal-channel angular pressing was found to improve not only hardness in certain specimens tested but also the strength of others as revealed by tensile tests. Moreover, the two most important machinability criteria, that is, cutting forces and surface roughness, were measured to find a significant reduction in cutting forces. The specimens produced by the process indeed exhibited better machinability properties as required by the cutting force criteria. Finally, a significant improvement was observed in the surface roughness of equal-channel angular pressing–produced specimens.

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“…Ebrahimi et al 22 used the finite element method (FEM) to obtain higher values of the effective strain, more uniform strain distributions, and lower pressing forces in ECAP. Luri and Luis Pérez 23 performed a numerical investigation on the effect of the geometrical parameters of the dies and the part on the punch force in the equal-channel angular extrusion process. Xu et al 24 investigated the influence of the geometrical and frictional parameters of the die on the deformation behavior of the pure aluminum sheets in the ECAR process.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of equivalent plastic strain in equal-channel angular rolling using response surface methodology

Chari

Kami

Dariani

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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The mechanical properties of metallic strips can be improved by producing an ultra-fine-grained microstructure. The equal-channel angular rolling process is a severe plastic deformation technique suitable for such a purpose. In this article, the effect of the equal-channel angular rolling parameters on the equivalent plastic strain is investigated and their optimum values are reported. The analysis is focused on the following parameters: thickness ratio (K), die channel angle (u), die outer corner angle (c), fillet radius (r), friction coefficient between strip and rolls (m), and friction factor between strip and die (m). Using a combination of the finite element modeling and the response surface methodology with central composite design, a simple and efficient quadratic model is developed to predict the equivalent plastic strain dependence on the equal-channel angular rolling process parameters. The analysis of variance is applied to assess the validity of the model and find the significant parameters. The results show that the die channel angle is the most significant parameter, while the friction coefficient between strip and rolls has no considerable effect on equivalent plastic strain. Moreover, the following optimum values of the parameters are obtained: K = 0.96, u= 90.10°, c= 21.21°, r = 2.31 mm, m= 0.20, and m = 0.19. An increase of about 14.86% in the equivalent plastic strain can be achieved by adopting these values for the process parameters.

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Analysis and modelling by finite element method of the equal channel angular extrusion pressure

Cited by 6 publications

References 27 publications

The effects of die geometry in tube channel pressing: Severe plastic deformation

The effects of die geometry in tube channel pressing: Severe plastic deformation

Mechanical properties and machinability of 6061 aluminum alloy produced by equal-channel angular pressing

Modeling and optimization of equivalent plastic strain in equal-channel angular rolling using response surface methodology

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