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Dissertations / Theses on the topic 'Powder compaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Yap, Siaw Fung. "Micromechanics and powder compaction." Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489036.

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2

Olsson, Erik. "Micromechanics of Powder Compaction." Doctoral thesis, KTH, Hållfasthetslära (Avd.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159142.

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Compaction of powders followed by sintering is a convenient manufacturing method for products of complex shape and components of materials that are difficult to produce using conventional metallurgy. During the compaction and the handling of the unsintered compact, defects can develop which could remain in the final sintered product. Modeling is an option to predict these issues and in this thesis micromechanical modeling of the compaction and the final components is discussed. Such models provide a more physical description than a macroscopic model, and specifically, the Discrete Element Meth

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3

Cameron, I. M. "Powder characterisation for compaction modelling." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636198.

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In this thesis, experimental investigations into powder-die friction and powder yielding measurement techniques, and numerical modelling work on powder-die friction mechanisms are presented. The experimental friction work explores the use of a shear-plate technique to measure the frictional characteristics between a compacted powder and a target surface. The study confirms that the shear-plate technique is valid to measure these frictional characteristics. Surface roughness and hardness was explored fully for both Iron and an Alumina power. This confirmed the major impacts of surface hardness,

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4

Gaboriault, Jr Edward M. "The Effects of Fill-Nonuniformities on the Densified States of Cylindrical Green P/M Compacts." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/853.

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"We focus attention on single-punch compaction of metal powders in cylindrical dies. In one case, we consider solid cylindrical compacts, and take the die walls to be frictionless in order to isolate the effects of initial nonuniformities in powder fill on the final green density distribution of the compact. First, a model is introduced in which the die is filled with n distinct powders that occupy concentric annular regions within the die. The model requires that the balance of mass, the balance of momentum, and a realistic equation of state be satisfied in each region, and includes a plau

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5

Berg, Sven. "Ultra high-pressure compaction of powder." Doctoral thesis, Luleå tekniska universitet, Material- och solidmekanik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16908.

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Sintering at high-pressure improves the properties of the material, either through new sintering aids becoming available or through improving intergranular bonding. This gives the manufactured products potential advantages like faster cut rates, and more precise and cleaner production methods that add up to cost efficiency and competitive edge. The production of synthetic diamond products demands tooling that can achieve high pressures and deliver it with a high degree of certainty. The common denominator for almost all high-pressure systems is to use capsules where a powder material encloses

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6

Fernando, M. S. D. "Traction induced compaction of maize powder." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38311.

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7

Fredenburg, David Anthony. "Shock compaction and impact response of thermite powder mixtures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37130.

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This dissertation focuses on developing a predictive method for determining the dynamic densification behavior of thermite powder mixtures consisting of equivolumetric mixtures of Ta + Fe₂O₃ and Ta + Bi₂O₃. Of primary importance to these highly reactive powder mixtures is the ability to characterize the stress at which full compaction occurs, the crush strength, which can significantly influence the stress required to initiate reaction during dynamic or impact loading. Examined specifically are the quasi-static and dynamic compaction responses of these mixtures. Experimentally obtained compact

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8

Shang, Chenglong. "Modelling powder compaction and breakage of compacts." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10824.

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Experimental and numerical simulation studies were carried out to enhance the understanding of the compaction behaviour of powder materials and to study the breakage behaviour of tablets after compaction. In order to simulate powder compaction and post compaction behaviour an appropriate constitutive model is required. To calibrate the constitutive model (e.g. a Drucker-Prager Cap model) a series of experiments were carried out including closed die compaction, uniaxial and diametrical compression tests. A newly developed apparatus consisting of a die instrumented with radial stress sensors was

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9

Trivic, Nikola Zavaliangos Antonios. "Cyclic compaction of soft-hard powder mixtures /." Philadelphia : Drexel University, 2003. http://dspace.library.drexel.edu/handle/1721.1/99.

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10

Choi, Jinnil Lee. "Multiscale modelling and measurements for powder compaction." Thesis, Swansea University, 2007. https://cronfa.swan.ac.uk/Record/cronfa42620.

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In this thesis, experimental investigations into friction between powder and die (macro scale), numerical modelling of a micro scale friction measurement method by atomic force microscopy, and numerical modelling of compaction and friction processes at a micro scale are presented. The experimental work explores friction mechanisms by using an extended sliding plate apparatus for low load running over a longer distance to measure frictional characteristics between powder compact and target surface with variation of powders, loads, surface finishes, and speed. The behaviour of the static and dyn

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11

Olsson, Erik. "Micromechanics of Powder Compaction and Particle Contact." Licentiate thesis, KTH, Hållfasthetslära (Avd.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117608.

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12

Kempen, Daniel. "Thermomechanical modelling of powder compaction and sintering." Doctoral thesis, Università degli studi di Trento, 2019. https://hdl.handle.net/11572/369024.

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An elastic-visco-plastic thermomechanical model for cold forming of ceramic powders and subsequent sintering is introduced and based on micromechanical modelling of the compaction process of granulates. Micromechanics is shown to yield an upper-bound estimate to the compaction curve of a granular material, which compares well with other models and finite element simulations. The parameters of the thermomechanical model are determined on the basis of available data and dilatometer experiments. Finally, after computer implementation, validation of the model is performed with a specially designed

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13

Kempen, Daniel. "Thermomechanical modelling of powder compaction and sintering." Doctoral thesis, University of Trento, 2019. http://eprints-phd.biblio.unitn.it/3551/1/20180318_Thesis_Daniel_Kempen.pdf.

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An elastic-visco-plastic thermomechanical model for cold forming of ceramic powders and subsequent sintering is introduced and based on micromechanical modelling of the compaction process of granulates. Micromechanics is shown to yield an upper-bound estimate to the compaction curve of a granular material, which compares well with other models and finite element simulations. The parameters of the thermomechanical model are determined on the basis of available data and dilatometer experiments. Finally, after computer implementation, validation of the model is performed with a specially designed

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14

Khambekar, Jayant Vijay. "Models for compaction and ejection of powder metal parts." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0430103-145150/.

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15

Nokhodchi, Ali. "The compaction properties of hydroxypropylmethylcellulose and ibuprofen." Thesis, Liverpool John Moores University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319846.

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16

Ogbonna, Nkemdirim. "Indentation and compaction of inelastic solids." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320043.

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17

Chen, Xiaolin. "Particle packing, compaction and sintering in powder metallurgy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0014/NQ34746.pdf.

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18

Mohd, Ihsan A. K. A. "Powder compaction, finite element modelling and experimental validation." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638216.

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In the modelling of powder compaction, the behaviour of powders is assumed to be rate-independent elastoplastic, and the process may be described by a large displacement based finite element formulation. Three constitutive relationships to describe the mechanical behaviour of the powders were examined, namely a Mohr-Coulomb yield surface, an elliptical cap yield surface and a combined yield surface model. Of all the models tested, an elliptical cap was shown to be the most appropriate for the compaction phase. An incremental elastoplastic material model was used to simulate the relaxation phas

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19

Marshall, P. V. "The role of crystalline modifications in powder compaction." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378113.

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20

Kong, Consuelo Margarita. "Discrete element analysis of powder processing : fill and compaction /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488193665236977.

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21

Venz, Gary Jon. "Hot shock compaction of nanocrystalline alumina." Thesis, Queensland University of Technology, 2002.

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22

Kaushik, Anshul. "Analysis of powder compaction process through equal channel angular extrusion." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2540.

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23

Howe, D. P. "The production of aluminium based bearing materials by powder compaction." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317093.

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24

Ashraf, Mufti Mohmed. "The application of rotary forging technique to powder metal compaction." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361856.

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25

Abou-Chedid, Georges Victor. "Experimental yield surface studies for the compaction of metal powder." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12469.

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26

Lum, Susan Kar Yee. "A viscoelastic analysis of particle-particle deformation in pharmaceutical powder compaction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0005/NQ41220.pdf.

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27

Schiano, Serena. "Dry granulation using roll compaction process : powder characterization and process understanding." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813905/.

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In recent years, dry granulation using roll compaction (DGRC) attracts considerable interest of engineers and researchers, especially in the pharmaceutical industry, due to its distinct feature that no liquid binder is needed. It is generally anticipated that as a size enlarge process, DGRC would improve properties of feed powders (such as flowability and bulk density), but it was also reported that DGRC could cause a reduction in powder compactibility. A wide range of powder properties, such as size, shape, flowability, compactibility and compressibility, were analysed for several pharmaceuti

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28

Sundaresh, Shlok. "A Mesoscopic Approach Towards Modeling of Compaction Process in Powder Metallurgy." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406225280.

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29

Korachkin, Dzmitry. "Measurement methods for the determination of powder properties for compaction modelling." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42288.

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In this thesis an experimental investigation into the measurement methods for determination of model parameters for the compaction, unloading and ejection stages and a numerical investigation on the effects of fill density distribution are presented. The numerical investigation explored the effect of fill density distribution on green density in powder compacts and on tool forces. This was achieved by comparing the results of simulations with uniform and non-uniform fill density distributions. The investigation considered three different powder types (ferrous, hard metal and ceramic), a select

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30

Zughaer, Hussien Jasim. "The effect of high strain deformation on the compaction of metal powders." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277591.

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31

Azhdar, Bruska. "Improved high velocity cold compaction processing : Polymer powder to high performance parts /." Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-407.

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32

Che, Lida. "Numerical constitutive laws for powder compaction using particle properties and packing arrangement." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/40677.

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Numerical studies, calibrated and validated using experiments, were carried out to develop a constitutive law for powder compaction. In order to simulate powder compaction at particle level, single particle compression/breakage test is used to characterise the mechanical properties, which include elastic modulus, Poisson’s ratio and yield strength. Finite Element Analysis (FEA) of single particle compression was carried out and validated vs. single particle compression testing and then used to establish a suitable hardening law. The particle size, shape and packing arrangement were obtained us

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33

Babaei, Pardis. "Investigation of elastic powder properties using analytical powder decompression : Effects of tablet compaction parameters, pressure, speed, and lubrication." Thesis, Uppsala universitet, Institutionen för farmaci, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-418550.

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Aim: The objective of this project was to use analytical powder decompression (APDC) in tablet compaction processes to study the elastic behavior of powders. Background: During powder compaction, the particles undergo four stages of rearrangement, plastic deformation or particle fracture, and elastic deformation. The analytical powder compression protocol considers the loading phase and the elastic deformation during the unloading phase is neglected (Nordström et al., 2012). Using APDC analysis may give access to the underlying elastic characteristics of powders including tablet elastic recove

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34

Al-Sabbagh, Muhanad Nazar. "Influence of contact strength between particles on constitutive law for powder compaction and the strength of powder compacts." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42788.

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Powder compaction is used in a wide range of industrial applications ranging from powder metallurgy, food, pharmaceuticals, consumer goods, catalysts, fuels briquettes, etc. Powder compaction can be defined in terms of 1) compactibility, which represents the ability to form strong compacts, which is quantified by compact strength and 2) compressibility, which represents the ability of the powder mass to form dense compacts and is described by the constitutive law. The aim of this work is to establish relationships between particle properties, (including mechanical properties of particles and i

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35

Marais, Philip Grant. "A new constitutive model for the finite element analysis of metal powder compaction." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/9250.

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Bibliography: leaves 60-61.<br>During the commercial compaction of metal powder in a punch-die setup and the subsequent sintering of the compacted preform, the large confining pressures, friction and heat that arise determine the properties of the final component. An important application of the modelling of metal powder compaction is the determination of the properties of the compacted preform as these affect the properties of the final sintered component. An uneven density distribution in the compacted preform, for example, can cause cracking in the component during the sintering stage. The

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36

Parker, I. "A study of brittle powder compaction using a combined discrete finite element approach." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/12511.

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Bibliography: leaves 100-103.<br>The Discrete Element Method (DEM) is a collection of numerical techniques based on a discontinuum idealisation of a physical system. Discrete Element Methods have been successfully applied to the simulation of the dynamic behaviour of granular media. Using the Finite Element Method to model the behaviour of each discrete element has resulted in the Combined Finite Discrete Element Method. This combination allows researchers to investigate the behaviour of assemblies of particles in which each particle need not behave in an entirely elastic mamrer. More importan

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37

Wen, Guoping. "Finite element modeling and machine design for powder compaction in a cylindrical mold /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9901298.

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38

Seminari, Umugaba. "Production of nanocrystalline aluminium alloy powders through cryogenic milling and consolidation by dynamic magnetic compaction." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100234.

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Nanopowders and bulk nanostructred materials have gained large interest in recent years. Bulk nanostructured materials exhibit properties that are far superior in comparison to conventional micron grained alloys. The fabrication of large scale nano-grained materials has been achieved in a two step process: (1) the production of nanostructured aluminium alloy powders and (2) the consolidation of the powder using a electromagnetic shockwave process.<br>The first part consists of cryo-milling; the milling of powder in an attritor filled with liquid nitrogen. This causes successive welding and fra

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39

Liang, Li. "Recycling of concrete waste with wood waste through heating compaction." Thesis, KTH, Betongbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275674.

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Concrete, as primary building material, is widely used in most construction project. For this reason, large amounts of concrete waste were generated from construction and demolition. One way to reuse concrete waste is to use it as backfill material for landfilling and road bases. While the demand for backfill material is decreasing as the basic infrastructure construction gradually completes. Another way to reuse concrete waste is to grind it and use it as aggregate in casting new concrete. However, the reuse as aggregate for casting concrete requires large amount of cement. It is unsustainabl

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40

Gregorski, Steven Joseph. "High green density metal parts by vibrational compaction of dry powder in three dimensional printing process." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/8179.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.<br>Includes bibliographical references (p. 395-399).<br>The material properties and dimensional accuracy of metal tooling produced by the Three Dimensional Printing process can be enhanced by increasing the green density of the 3D printed part. Green density is the ratio of metal powder volume to the external volume of the printed part, and is a measure of how tightly packed the powder particles in the printed part are. The central goal of this thesis was to increase the green density of metal parts

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41

Nichols, Leannah Marie. "Feasibility Study of Consolidation by Direct Compaction and Friction Stir Processing of Commercially Pure Titanium Powder." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc862720/.

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Commercially pure titanium can take up to six months to successfully manufacture a six-inch in diameter ingot in which can be shipped to be melted and shaped into other useful components. The applications to the corrosion-resistant, light weight, strong metal are endless, yet so is the manufacturing processing time. At a cost of around $80 per pound of certain grades of titanium powder, the everyday consumer cannot afford to use titanium in the many ways it is beneficial simply because the number of processing steps it takes to manufacture consumes too much time, energy, and labor. In this res

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42

Naicker, Hiranya. "Parametric study on the compactibility of Ti-6Al-4V during direct powder rolling." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31009.

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The widespread use of titanium and its alloys in structural applications has been limited to few highend applications. The dominant reason for this being cost implications. These high costs arise from extracting titanium from its mineral form as well as that of the manufacturing processes to develop a final product. Since producing titanium products includes expensive starting stock, high machinability costs and high wastage, a need for a process that may minimize one or more of these factors is necessary. One such technology that exists is a branch of powder metallurgy (PM), direct powder rol

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43

Mathonnet, Jean-Eric. "Compaction et écoulement des milieux granulaires cohésifs assistés par vibrations : application au remplissage des moules de presse." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4729.

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Dans le cadre du projet ASTRID, le procédé de fabrication du combustible nucléaire par métallurgie des poudres, pour les RNR, est revisité dans le but d’être simplifié. En particulier, nous cherchons à supprimer l’étape de granulation mécanique de la poudre qui lui confère un bon comportement à l’écoulement. La problématique, est d’arriver à faire s’écouler spontanément et rapidement une poudre, à travers un orifice par lequel elle ne s’écoule pas naturellement. Par ailleurs, la poudre alterne entre des phases d’écoulement et de non-écoulement.Pour garantir l’écoulement de la poudre à travers

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44

Mahmoodi, Foad. "Compression Mechanics of Powders and Granular Materials Probed by Force Distributions and a Micromechanically Based Compaction Equation." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-171874.

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The internal dynamics of powder systems under compression are as of yet not fully understood, and thus there is a necessity for approaches that can help in further clarifying and enhancing the level of understanding on this subject. To this end, the internal dynamics of powder systems under compression were probed by means of force distributions and a novel compaction equation. The determination of force distributions hinged on the use of carbon paper as a force sensor, where the imprints transferred from it onto white paper where converted through calibration into forces. Through analysis of

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45

Lwin, Mark. "The dynamic compaction of the metastable hard magnet powder Sm!b2!sFe!b17!sNx to form bulk magnets." Thesis, Queensland University of Technology, 1994.

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46

Renaud, Sylvère. "Elaboration de poudres Ti2Be17, Al-Be et Al-Be-Ti par mécano-synthèse, et étude préliminaire de leur consolidation." Châtenay-Malabry, Ecole centrale de Paris, 1995. http://www.theses.fr/1995ECAP0439.

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Le but de ce travail est d'élaborer un matériau de structure a base de béryllium pour des applications aéronautiques à hautes températures. Le procédé d'élaboration envisagé est celui de la métallurgie des poudres qui inclut la mécano-synthèse de préalliages, puis la mise en forme des poudres obtenues par compression isostatique à chaud. Ce procédé devrait permettre l'obtention de matériaux à structure et à grains très fins, ce qui est souhaitable pour des composes intermétalliques relativement fragiles. Les broyeurs utilises sont un SPEX8000 pour les études et un broyeur à boulets pour des pr

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47

Kallel, Achraf. "Compaction à chaud de nanopoudres SiGe : du process aux propriétés thermoélectriques." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI096/document.

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La récupération d’énergie par effet thermoélectrique est une technologie fiable avec un grand potentiel. Dans la gamme des hautes températures, il est nécessaire que les générateurs thermoélectriques soient fabriqués à partir d’un matériau massif pour gagner en puissance électrique. Dans la littérature, la nanostructuration baisse la conductivité thermique et permet d’augmenter le rendement de conversion. Par contre, l’effet de la porosité n’est pas clarifié. Par contre, l’effet de la porosité est sujette à controverse.Dans ce travail, l’alliage Si80Ge20 type n est élaboré par mécanosynthèse.

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48

Bodard, Sébastien. "Expérimentations et approche numérique de la transition combustion-déflagration-détonation dans les milieux pulvérulents initiée par un impact à faible vitesse." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4743/document.

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La présente thèse se concentre tout d'abord à mettre en place des expérimentations de compaction dynamique de poudres.Un montage expérimentale est conçu, testé puis validé. Le but de ce dernier est de générer des ondes de compaction unidimensionnelles et de pouvoir observer le milieu granulaire à l'échelle des grains. Deux types de poudres sont considérés : une poudre de polypropylène et une poudre d'explosif (RDX).Pour cela, des caméras ultra-rapides (50 000 images/s) sont utilisée pour enregistrer les essais. Une technique de corrélation d'image est utilisée pour remonter aux champs de dépla

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49

Argento, Claudio. "Modélisation du comportement thermique et mécanique des poudres métalliques : application à la compaction isostatique à chaud." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10084.

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Le but initial de cette these est de produire, a partir d'un code de calcul par elements finis existant, un outil fiable et souple pour la simulation du processus de compaction isostatique a chaud de poudres metalliques. Pour cela nous avons developpe un modele thermomecanique complet decrivant le comportement de la poudre pendant la compaction. Dans un premier temps, nous proposons une nouvelle loi constitutive elasto-viscoplastique avec ecrouissage en densite. Cette loi possede un parametre supplementaire qui permet de controler explicitement le couplage entre les parties isotrope et deviato

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50

Mazor, Alon. "Modelling of roll compaction process by finiite element method." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2017. http://www.theses.fr/2017EMAC0009/document.

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Dans l’industrie pharmaceutique, la granulation sèche par compactage à rouleaux est un procédé d’agglomération de poudres en granulés pour améliorer les propriétés d’écoulement nécessaire pour le procédé de compression en matrice. Comprendre le procédé de compactage à rouleaux et optimiser l’efficacité de production est limitée par l’utilisation de l’approche expérimentale à cause du coût élevé des poudres, le temps des essais et la complexité du procédé. Dans ce travail, une méthode d’éléments finis en 3D, est développée dans le but d’identifier les paramètres critiques du matériau et du proc

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