Numerical modelling of large deformation in metal powder forming

Lewis, R. W.; Khoei, A.R.

doi:10.1016/s0045-7825(97)00276-4

Cited by 60 publications

(96 citation statements)

References 21 publications

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“…Several constitutive models have been proposed, including microscopic models, flow formulations and solid mechanics models, such as elastic, plastic or viscoplastic models; see Oliver et al [1] and Lewis and Khoei [2] for a general overview and references for each type of model. One of the most common approaches is the use of elastoplastic models based on porous or frictional materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient and accurate approach for powder compaction problems

Foguet¹,

Ferran²,

Huerta³

2003

Computational Mechanics

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In this paper, a new approach for powder cold compaction simulations is presented. A density-dependent plastic model within the framework of finite strain multiplicative hyperelastoplasticity is used to describe the highly nonlinear material behaviour; the Coulomb dry friction model is used to capture friction effects at die-powder contact; and an Arbitrary Lagrangian-Eulerian (ALE) formulation is used to avoid the (usual) excessive distortion of Lagrangian meshes caused by large mass fluxes. Several representative examples, involving structured and unstructured meshes are simulated. The results obtained agree with the experimental data and other numerical results reported in the literature. It is shown that, contrary to other Lagrangian and adaptive h-remeshing approaches recently reported for this type of problems, the present approach verifies the mass conservation principle with very low relative errors (less than 1% in all ALE examples and exactly in the pure Lagrangian examples). Moreover, thanks to the use of an ALE formulation and in contrast with other simulations, the presented density distributions do not present spurious oscillations.

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Section: Introductionmentioning

confidence: 99%

Efficient and accurate approach for powder compaction problems

Foguet¹,

Ferran²,

Huerta³

2003

Computational Mechanics

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“…angle of repose, false angle of repose [46], angle of sliding) showing the powder behavior complexity. It is not so clear which of these parameters, or a combination of them, fit well the internal friction angle, 1 b of the Drucker Prager surface (7). For this reason we focus on the behavior of the powder while it is delivered into the die.…”

Section: Characterization Of the Internal Frictionmentioning

confidence: 99%

“…During the last twenty years, several research groups have developed different numerical models to capture the evolution of the most relevant properties such as density and applied forces, during the compaction process. Most of them [2][3][4][5][6][7][8][9] have concentrated their efforts on the numerical simulation of the compaction itself and some [10][11][12] have included the transfer stage. However, die filling has been little analysed.…”

Section: Introductionmentioning

confidence: 99%

Flow regime analyses during the filling stage in powder metallurgy processes: experimental study and numerical modelling

et al. 2010

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Experimental and numerical studies of powder\ud flow during the die filling stage in powder metallurgy cold\ud compaction processes are presented. An experimental setting\ud consisting of a horizontal pneumatically activated shoe,\ud a vertical die and high-speed video system has been designed.\ud The experiments show the existence of three flow regimes:\ud continuous, transitory and discrete, which are identified in\ud terms of the particle size, the morphology and the speed of\ud the shoe. In the continuous regime the powder flows in a progressive\ud manner but in the discrete one some perturbations\ud appear as a consequence of a shear band formation that forms\ud discrete avalanches. A numerical model, based on a ratedependent\ud constitutive model, via a flow formulation, and in\ud the framework of the particle finite element method (PFEM)\ud is also proposed. For the purpose of this study, the use of the\ud PFEM assumes that the powder can be modelled as a continuous\ud medium. The model, provided with the corresponding\ud characterisation of the parameters, is able to capture the two\ud fundamental phenomena observed during the filling process:\ud (1) the irreversibility of most of the deformation experienced\ud by the material and (2) the quick dissipation of the potential\ud gravitatory energy of the granular system through the inter-particle friction processes, modelled by the plastic dissipation\ud associated with the material model. Experimental and\ud numerical results have been compared in order to study the\ud viability of the proposed model.Peer ReviewedPreprin

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“…К текущему моменту большинство материальных моделей, описывающих такой переход, основаны на модели, предложенной в работе Друкера [10], которая определяла особенно-сти деформирования пористых грунтов. На основе данной работы различными авторами предложен ряд аналогичных критериев [6,[11][12][13][14]. Критерии описы-вают новые модели, описывающие особенности де-формирования различных пористых материалов, например: неслипающихся порошков [6], конгломе-ратов порошков [11], металлических слипающихся порошков [12], слипающихся порошков [13], фарма-цевтических таблеток [14].…”

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“…На основе данной работы различными авторами предложен ряд аналогичных критериев [6,[11][12][13][14]. Критерии описы-вают новые модели, описывающие особенности де-формирования различных пористых материалов, например: неслипающихся порошков [6], конгломе-ратов порошков [11], металлических слипающихся порошков [12], слипающихся порошков [13], фарма-цевтических таблеток [14]. В настоящей работе в качестве критерия текучести используется несиммет-ричная поверхность течения следующего вида [11]: Начальные условия для моделирования соот-ветствуют случаю, когда пресс-порошок свободно насыпан в пресс-форму.…”

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Software for press molding simulation for powder products

Matolygin¹,

Istomin²,

Noskov³

et al. 2016

Proceedings of TUSUR

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Программный комплекс для моделирования процесса прессования изделий из порошковПредставлен программный комплекс, предназначенный для моделирования процесса прессования изделий из порошковых материалов. Комплекс состоит из модулей подготовки данных, расчета, визуализации и хранили-ща данных. Программный комплекс позволяет рассчитывать напряженно-деформированное состояние прессов-ки при формовании. В статье описывается методика использования программного комплекса для оптимизации процесса компактирования изделий из порошковых материалов. Ключевые слова: программный комплекс, математическое моделирование, методы механики сплошной сре-ды, прессование, порошки.

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Numerical modelling of large deformation in metal powder forming

Cited by 60 publications

References 21 publications

Efficient and accurate approach for powder compaction problems

Efficient and accurate approach for powder compaction problems

Flow regime analyses during the filling stage in powder metallurgy processes: experimental study and numerical modelling

Software for press molding simulation for powder products

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