Three-dimensional numerical simulations of multi-pass equal-channel angular pressing by a variation difference method and comparison with experiment

Smolyakov, A.; Solovyev, V.P.; Korshunov, A. I.; Enikeev, Nariman A.

doi:10.1016/j.msea.2007.06.089

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Smolyakov et al [9] proposed a variation-difference method for solving continuum mechanics equations to simulate the ECAP process and studied the effect of processing parameters on the stress and strain distribution over the cross-section of ECAP samples. Korshunov et al [10] investigated the annealed commercial pure titanium processed by four ECAP passes at 450°C via route B C , in which the repeated rotation angle around the longitudinal billet axis before reinsertion in the die was 90°, and found that the anisotropy after all the ECAP passes of processing is similar at both room temperature and elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical coupling simulation and experimental study in the isothermal ECAP processing of Ti-6Al-4V alloy

Zhang

Luo

et al. 2010

Rare Metals

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The thermomechanical coupling simulation of the isothermal equal channel angular pressing (ECAP) of Ti-6Al-4V alloy was conducted. The effect of processing parameters, ECAP pass number and the residual billet on the effective strain, stress and temperature distribution was investigated. Based on the coupling simulation results, it is found that the shear factor, ram speed, deformation temperature, channel intersection angle and residual billet significantly affect the ECAP deformation behaviors. Meanwhile, the experimental study of the isothermal ECAP process of Ti-6Al-4V alloy using route C, in which the repeated rotation angle around the longitudinal billet axis before reinsertion in the die was 180°, were conducted at a deformation temperature of 750°C, a ram speed of 0.3 mm⋅s −1 , an outer arc of curvature of 60° and a channel intersection angle of 120°. Furthermore, a large amount of recrystallization occurs and some prior α phase grains grow in the post-ECAP process of Ti-6Al-4V alloy. The yield strength of post-ECAP Ti-6Al-4V alloy increases compared with that of as-received Ti-6Al-4V alloy.

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Section: Introductionmentioning

confidence: 99%

Thermomechanical coupling simulation and experimental study in the isothermal ECAP processing of Ti-6Al-4V alloy

Zhang

Luo

et al. 2010

Rare Metals

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“…7(b)), it is possible to estimate the coef cient of friction during ECAE for copper as μ = 0.021. This value has a percentage error of 5% in relation to the experimental value of 0.02 estimated by Smolyakov et al 31) The method of this study was also applied to pure aluminum. Contrary to the case already discussed, the graphics for the pure aluminum case are not presented, to maintain the conciseness of this work.…”

Section: Determination Of the Coef Cient Of Friction In Ecaementioning

confidence: 52%

Numerical Estimation of Frictional Effects in Equal Channel Angular Extrusion

2016

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The purpose of this study is to numerically estimate the friction coef cient for equal channel angular extrusion with and without back pressure. Three-dimensional nite element analysis is employed to estimate the coef cient of friction from the maximum pressing load, a crucial variable in die design. The nite element model consists of a billet, a plunger, a ram, and a die, where the interface between the billet and the die is modeled by the Coulomb friction model with truncated shear stress. The numerical model was validated by comparing the grid deformation patterns in the extrusion symmetry plane, and by comparing the load versus stroke curves for the ram (pressing load) and for the plunger (back pressure). Results indicate that the coef cient of friction can be accurately estimated from the maximum pressing load, but it is necessary to modify the traditional Coulomb friction model.

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“…This issue can be critical for the components fabricated of the materials with lower crystal symmetry (such as Ti having the HCP lattice). Note that multi-scale computational approaches [ 23 , 35 , 36 ] developed to describe nanostructuring processes of Ti materials by ECAP demonstrated that macroscale simulation coupled with polycrystal models provided better description of its deformation behavior. They also allowed to take into consideration the texture effects important to account for the anisotropic properties [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

Kazarinov

Stotskiy²,

Polyakov³

et al. 2022

Materials

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The study is aimed to virtually miniaturize medical implants produced of the biocompatible Ti with improved mechanical performance. The results on the simulation-driven design of medical implants fabricated of nanostructured commercially pure Ti with significantly enhanced mechanical properties are presented. The microstructure of initially coarse-grained Ti has been refined to ultrafine grain size by severe plastic deformation. The ultrafine-grained (UFG) Ti exhibits remarkably high static and cyclic strength, allowing to design new dental and surgical implants with miniaturized geometry. The possibilities to reduce the implant dimensions via virtual fatigue tests for the digital twins of two particular medical devices (a dental implant and a maxillofacial surgery plate) are explored with the help of finite element modeling. Additionally, the effect of variation in loading direction and the fixation methods for the tested implants are studied in order to investigate the sensitivity of the fatigue test results to the testing conditions. It is shown that the UFG materials are promising for the design of a new generation of medical products.

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Three-dimensional numerical simulations of multi-pass equal-channel angular pressing by a variation difference method and comparison with experiment

Cited by 9 publications

References 20 publications

Thermomechanical coupling simulation and experimental study in the isothermal ECAP processing of Ti-6Al-4V alloy

Thermomechanical coupling simulation and experimental study in the isothermal ECAP processing of Ti-6Al-4V alloy

Numerical Estimation of Frictional Effects in Equal Channel Angular Extrusion

Finite Element Modeling for Virtual Design to Miniaturize Medical Implants Manufactured of Nanostructured Titanium with Enhanced Mechanical Performance

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