Analysis of Powder Compaction Process Using Nonlinear Finite Element Method PDF Download
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Author: Wing You Loo
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Wing You Loo
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Amir Khoei
Publisher: Elsevier
ISBN: 0080529704
Category : Technology & Engineering
Languages : en
Pages : 483
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The powder forming process is an extremely effective method of manufacturing structural metal components with high-dimensional accuracy on a mass production basis. The process is applicable to nearly all industry sectors. It offers competitive engineering solutions in terms of technical performance and manufacturing costs. For these reasons, powder metallurgy is developing faster than other metal forming technology. Computational Plasticity in Powder Forming Proceses takes a specific look at the application of computer-aided engineering in modern powder forming technologies, with particular attention given to the Finite Element Method (FEM). FEM analysis provides detailed information on conditions within the processed material, which is often more complete than can be obtained even from elaborate physical experiments, and the numerical simulation makes it possible to examine a range of designs, or operating conditions economically. * Describes the mechanical behavior of powder materials using classical and modern constitutive theories.* Devoted to the application of adaptive FEM strategy in the analysis of powder forming processes.* 2D and 3D numerical modeling of powder forming processes are presented, using advanced plasticity models.
Author: Jae-Young Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Author: Stephano Odorico
Publisher:
ISBN:
Category : Compacting
Languages : en
Pages :
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The objective of this project was to develop a finite element model for 2-level powder metallurgy cold compaction process using Strand 6.1 Finite Element Software.
Author: Anshul Kaushik
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A thermodynamic framework was presented for the development of powder constitutive models. The process of powder compaction through Equal Channel Angular Extrusion (ECAE) at room temperature was modeled using the finite element analysis package ABAQUS. The simulation setup was used to conduct a parametric study involving varying the process parameters of ECAE, aimed at aiding the process design. Two powder compaction models, the Gurson model and the Duva and Crow model, were used to test their efficacy in modeling this process. The thermodynamic framework was applied to derive the constitutive equations of the Duva and Crow model. Modeling parameters like friction coefficients, interaction conditions were determined by comparing the simulations for solid billet and an empty can with actual experimental runs for loads, shear angle and workpiece geometry. The simulations using the two powder constitutive models showed no significant difference in the stress in the powder during the extrusion. The results obtained from the 3-D simulations were also compared to experiments conducted to compact copper powder with a size distribution of 10m to 45m. It was found through experiments that the powder does not fully consolidate near the outer corner of the workpiece after the first ECAE pass and the results from the simulations were used to rationalize this phenomenon. Modifications made to the process by applying a back pressure during the simulations resulted in a uniformly compacted powder region. Further, simulations were carried out by varying the process parameters like the crosshead velocity, the friction coefficient between the walls of the die and the can, can dimensions and material, shape of the can cross section etc and the effect of each of these parameters was quantified by doing a sensitivity analysis.
Author: Miguel Vaz Junior
Publisher: John Wiley & Sons
ISBN: 3527324798
Category : Technology & Engineering
Languages : en
Pages : 453
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With its discussion of strategies for modeling complex materials using new numerical techniques, mainly those based on the finite element method, this monograph covers a range of topics including computational plasticity, multi-scale formulations, optimization and parameter identification, damage mechanics and nonlinear finite elements.
Author: Dung Viet Tran
Publisher:
ISBN:
Category : Compacting
Languages : en
Pages :
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Author: Alon Mazor
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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In the pharmaceutical industry, dry granulation by roll compaction is a process of size enlargement of powder into granules with good flowability for subsequent die compaction process. Understanding the roll compaction process and optimizing manufacturing efficiency is limited using the experimental approach due to the high cost of powder, time-consuming and the complexity of the process. In this work, a 3D Finite Element Method (FEM) model was developed to identify the critical material properties, roll press designs and process parameters controlling the quality of the product. The Drucker-Prager Cap (DPC) model was used to describe the powder compaction behavior and was determined based on standard calibration method. To overcome the complexity involving two different mechanisms of powder feeding by the screw and powder compaction between rolls, a novel combined approach of Discrete Element Method (DEM), used to predict the granular material flow in the feed zone and the Finite Elements Method (FEM) employed for roll compaction, was developed. Lastly, for a more realistic roll compaction modelling, allowing the fluctuation of the gap between rolls, a Coupled-Eulerian Lagrangian (CEL) approach was developed. FEM simulation results clearly show the effect of different process parameters on roll pressure and density distribution in the compaction zone of powder between the rolls. Moreover, results show that using a cheek-plates sealing system causes a nonuniform roll pressure and density distribution with the highest values in the middle and the lowest at the edges. On the other hand, the resultant pressure and density distributions with the rimmed-roll obtained higher values in the edges than in the middle and overall a more uniform distribution. The combined DEM-FEM methodology clearly shows a direct correlation between the particle velocity driven by the screw conveyor to the feed zone and the roll pressure, both oscillating in the same period. This translates into an anisotropic ribbon with a density profile varying sinusoidally along its length. To validate the results, the simulations are compared with literature and experimentally measured values in order to assess the ability of the model to predict the properties of the produced ribbons.
Author: Alon Mazor
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
In the pharmaceutical industry, dry granulation by roll compaction is a process of size enlargement of powder into granules with good flowability for subsequent die compaction process. Understanding the roll compaction process and optimizing manufacturing efficiency is limited using the experimental approach due to the high cost of powder, time-consuming and the complexity of the process. In this work, a 3D Finite Element Method (FEM) model was developed to identify the critical material properties, roll press designs and process parameters controlling the quality of the product. The Drucker-Prager Cap (DPC) model was used to describe the powder compaction behavior and was determined based on standard calibration method. To overcome the complexity involving two different mechanisms of powder feeding by the screw and powder compaction between rolls, a novel combined approach of Discrete Element Method (DEM), used to predict the granular material flow in the feed zone and the Finite Elements Method (FEM) employed for roll compaction, was developed. Lastly, for a more realistic roll compaction modelling, allowing the fluctuation of the gap between rolls, a Coupled-Eulerian Lagrangian (CEL) approach was developed. FEM simulation results clearly show the effect of different process parameters on roll pressure and density distribution in the compaction zone of powder between the rolls. Moreover, results show that using a cheek-plates sealing system causes a nonuniform roll pressure and density distribution with the highest values in the middle and the lowest at the edges. On the other hand, the resultant pressure and density distributions with the rimmed-roll obtained higher values in the edges than in the middle and overall a more uniform distribution. The combined DEM-FEM methodology clearly shows a direct correlation between the particle velocity driven by the screw conveyor to the feed zone and the roll pressure, both oscillating in the same period. This translates into an anisotropic ribbon with a density profile varying sinusoidally along its length. To validate the results, the simulations are compared with literature and experimentally measured values in order to assess the ability of the model to predict the properties of the produced ribbons.
Author: Wolfgang Bier
Publisher: kassel university press GmbH
ISBN: 3899583965
Category :
Languages : en
Pages : 166
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