Download or read book A Mesoscopic Approach Towards Modeling of Compaction Process in Powder Metallurgy written by Shlok Sundaresh and published by . This book was released on 2014 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational modeling of powder metallurgy process is a challenging task. Critical defect issues like cracking at prior particle boundaries, porosity, etc. arising during manufacturing of powder metallurgy components need to be addressed and well understood from a fundamental standpoint. Experimental analysis of powder metallurgy is a time consuming and expensive process as replicating such critical defects is difficult and can be done only by trial and error techniques. Thus, the main focus of this work is on powder compaction modeling as powder compaction is a critical step in the manufacturing process. Various computational models exist for powder compaction either from a macroscopic/phenomenological aspect or a micromechanical aspect. This work provides an advanced computational framework for modeling powder compaction process using a mescoscopic modeling approach that links the phenomenological modeling to microscopic modeling. The fundamental mechanisms and true behavior of the powder during compaction have been captured through this approach. Effect of powder size, distribution and contact conditions between powder particles during compaction has been quantified through the mesoscopic compaction model. Representative volume elements (RVEs) for different stress states within the powder component have also been addressed.
Download or read book Modelling of Powder Die Compaction written by Peter R. Brewin and published by Springer Science & Business Media. This book was released on 2007-09-26 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manufacture of components from powders frequently requires a compaction step. Modelling of Powder Die Compaction presents a number of case studies that have been developed to test compaction models. It will be bought by researchers involved in developing models of powder compaction as well as by those working in industry, either using powder compaction to make products or using products made by powder compaction.
Download or read book Process Modeling in Powder Metallurgy Particulate Materials written by and published by . This book was released on 2002 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Developments in Computer Modeling of Powder Metallurgy Processes written by Antonios Zavaliangos and published by IOS Press. This book was released on 2001 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 25 papers from the NATO Advanced Research Workshop on Recent Advances of Computer Modeling of Powder Metallurgy Processes. The papers address cold compaction, sintering, high-temperature compaction, processing modeling, and processes and materials. The integration of mechanical and physical aspects of P/M processes is emphasized. Contributors include researchers from Europe, the United States, Korea, and Japan. Author index only. c. Book News Inc
Download or read book Advances in powder metallurgy written by A. Simchi and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Warm compaction is a cost saving and effective method for obtaining high performance powder metallurgy (PM) parts. This chapter presents the principles of warm compaction and technical aspects of the process. The green and sintered properties of warm compacted parts are discussed and compared with conventionally (cold) produced compacts. The applications of the process for ferrous and non-ferrous PM parts are presented and future trends are outlined.
Download or read book Powder Consolidation Using Cold Spray written by Atieh Moridi and published by Springer. This book was released on 2016-11-10 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book first presents different approaches to modeling of the cold spray process with the aim of extending current understanding of its fundamental principles and then describes emerging applications of cold spray. In the coverage of modeling, careful attention is devoted to the assessment of critical and erosion velocities. In order to reveal the phenomenological characteristics of interface bonding, severe, localized plastic deformation and material jet formation are studied. Detailed consideration is also given to the effect of macroscopic defects such as interparticle boundaries and subsequent splat boundary cracking on the mechanical behavior of cold spray coatings. The discussion of applications focuses in particular on the repair of damaged parts and additive manufacturing in various disciplines from aerospace to biomedical engineering. Key aspects include a systematic study of defect shape and the ability of cold spray to fill the defect, examination of the fatigue behavior of coatings for structural applications, and a novel working window at subcritical conditions to obtain porous structures. This book is exceptional in scope, and its review of finite element modelling at different length scales sheds light on future design and process improvement in emerging applications such as structural repair, metal additive manufacturing and metal foam design.
Download or read book Computational Modeling of Powder Compaction Processes written by Amir R. Khoei and published by . This book was released on 2003 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling of Roll Compaction Process by Finiite Element Method written by Alon Mazor and published by . This book was released on 2017 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances in Powder Metallurgy written by Isaac Chang and published by Elsevier. This book was released on 2013-08-31 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powder metallurgy (PM) is a popular metal forming technology used to produce dense and precision components. Different powder and component forming routes can be used to create an end product with specific properties for a particular application or industry. Advances in powder metallurgy explores a range of materials and techniques used for powder metallurgy and the use of this technology across a variety of application areas. Part one discusses the forming and shaping of metal powders and includes chapters on atomisation techniques, electrolysis and plasma synthesis of metallic nanopowders. Part two goes on to highlight specific materials and their properties including advanced powdered steel alloys, porous metals and titanium alloys. Part three reviews the manufacture and densification of PM components and explores joining techniques, process optimisation in powder component manufacturing and non-destructive evaluation of PM parts. Finally, part four focusses on the applications of PM in the automotive industry and the use of PM in the production of cutting tools and biomaterials. Advances in powder metallurgy is a standard reference for structural engineers and component manufacturers in the metal forming industry, professionals working in industries that use PM components and academics with a research interest in the field. Discusses the forming and shaping of metal powders and includes chapters on atomisation techniques Highlights specific materials and their properties including advanced powdered steel alloys, porous metals and titanium alloys Reviews the manufacture and densification of PM components and explores joining techniques
Download or read book Modelling of Roll Compaction Process by Finiite Element Method written by Alon Mazor and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Analysis of Compaction of 2 level Powder Metallurgy Components written by Stephano Odorico and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book New Methods for the Consolidation of Metal Powders written by Henry Herman Hausner and published by . This book was released on 1967 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Modeling in Powder Metallurgy Particulate Materials written by and published by . This book was released on 2002 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Models for Compaction and Ejection of Powder Metal Parts written by and published by . This book was released on 2003 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Powder Compaction Process Through Equal Channel Angular Extrusion written by Anshul Kaushik and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Determination of Cap Model Parameters for Powder Metal Compaction Using Numerical Optimization Methods written by Jonsoo Kim and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
