Flow regime analyses during the filling stage in powder metallurgy processes: experimental study and numerical modelling
| Autor: | C. González, Juan Oliver, Alvaro Isturiz, M. Dolores Riera, J. C. Cante, José Manuel Prado |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria, Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Universitat Politècnica de Catalunya. (MC)2 - Grup de Mecànica Computacional en Medis Continus, Universitat Politècnica de Catalunya. PROCOMAME - Processos de Conformació de Materials Metàl·lics |
| Předmět: |
Granular materials
Materials science Pulverimetal·lúrgia Matemàtiques i estadística::Anàlisi numèrica::Modelització matemàtica [Àrees temàtiques de la UPC] Flow (psychology) Constitutive equation General Physics and Astronomy Mechanics Dissipation Materials granulars Granular material Enginyeria dels materials [Àrees temàtiques de la UPC] Finite element method Mechanics of Materials Powder metallurgy Particle General Materials Science Shear band |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Experimental and numerical studies of powder flow during the die filling stage in powder metallurgy cold compaction processes are presented. An experimental setting consisting of a horizontal pneumatically activated shoe, a vertical die and high-speed video system has been designed. The experiments show the existence of three flow regimes: continuous, transitory and discrete, which are identified in terms of the particle size, the morphology and the speed of the shoe. In the continuous regime the powder flows in a progressive manner but in the discrete one some perturbations appear as a consequence of a shear band formation that forms discrete avalanches. A numerical model, based on a ratedependent constitutive model, via a flow formulation, and in the framework of the particle finite element method (PFEM) is also proposed. For the purpose of this study, the use of the PFEM assumes that the powder can be modelled as a continuous medium. The model, provided with the corresponding characterisation of the parameters, is able to capture the two fundamental phenomena observed during the filling process: (1) the irreversibility of most of the deformation experienced by the material and (2) the quick dissipation of the potential gravitatory energy of the granular system through the inter-particle friction processes, modelled by the plastic dissipation associated with the material model. Experimental and numerical results have been compared in order to study the viability of the proposed model. |
| Databáze: | OpenAIRE |
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