Cold Compaction of Polymer Powders PDF Download
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Author: Dietrich Giessner
Publisher:
ISBN:
Category : Compacting
Languages : en
Pages : 224
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Book Description
Author: Dietrich Giessner
Publisher:
ISBN:
Category : Compacting
Languages : en
Pages : 224
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Book Description
Author: Bruska Azhdar
Publisher:
ISBN: 9789171784599
Category :
Languages : en
Pages : 64
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Book Description
Author: Bruska Azhdar
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
Author: Rochelle A. Woods
Publisher:
ISBN:
Category : Polymers
Languages : en
Pages : 396
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Book Description
Author: Randall M. German
Publisher: ASM International
ISBN: 1627083197
Category : Technology & Engineering
Languages : en
Pages : 302
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Book Description
Binder and Polymer Assisted Powder Processing is an engineering guide to powder-binder-based manufacturing methods. It covers the basic principles, current and emerging practices, implementation, and cost.
Author: Andrej Šalak
Publisher: Cambridge Int Science Publishing
ISBN: 1898326827
Category : Technology & Engineering
Languages : en
Pages : 551
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Book Description
The machinability of powder metallurgy steels is poorer compared with wrought steels of appropriate composition and/or mechanical [properties. The reason for it is a larger number of material and processing variables affecting the final properties of a sintered material. Therefore the machining of powder metallurgy (PM) steels is a permanent subject of investigation and practice. The aim of the book is to make on the basis of present knowledge an overview of all interacting factors in machining process including those applied for the improvement of the machinability. There are the properties of basic plain iron and alloyed powders, various additions, compaction and sintering conditions. Effect of porosity, individual alloying elements and microstructure character is considered. The description of the basic machining processes with their characteristics and with the characteristics of the tool geometry belongs to the mentioned factors. For the improvement of machinability of PM steels different machining aids, as S, MnS, MoS2 and other are frequently used and their chemical and physical characteristics are given. The effect of various machining aids used on machinability of sintered plain iron, iron-carbon and of steels alloyed with Cu, Ni, Mo, Cr, Mn including powder forged steels with very different mechanical properties and very different microstructures is analysed and summarized. The high-speed steel, hardmetal and other tools with their geometry as the part of the cutting process are described in relation to the sintered powder materials. The recommendations for machining of various steels enclose the present knowledge about the machinability of powder metallurgy steels.
Author: M. Narkis
Publisher: John Wiley & Sons
ISBN:
Category : Science
Languages : en
Pages : 656
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Book Description
Low shear polymer powder processing provides unique solutions to many processing problems and offers a set of production techniques, frequently un-paralleled by other production methods. In recent years there has been increased interest in this field but no comprehensive review of the subject has been available until now. In this book, a team of experts have taken the novel approach of treating several processing techniques, such as compacted powder sintering, rotational moulding, powder coating, ram extrusion, and compression moulding, as diverse implementations of a single technology. The first chapters deal with the scientific and engineering fundamentals shared by various polymer powder processing techniques, and are followed by a detailed examination of each technique and some special effects. Polymer Powder Technology will prove invaluable to technologists, plastics and materials engineers, researchers and students working with various aspects of particulate polymer processing.
Author: K. Friedrich
Publisher: Elsevier
ISBN: 0444597395
Category : Technology & Engineering
Languages : en
Pages : 809
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Book Description
Much research has been carried out and a lot of progress has been made towards the use of composite materials in a wide field of tribological applications. In recent years studies have been made to determine to what degree phenomena governing the tribological performance of composites can be generalized and to consolidate interdisciplinary information for polymer-, metal- and ceramic matrix composites. The importance of promoting better knowledge in the areas of friction, lubrication and wear, in general, is demonstrated by the contents of this volume. It covers a wide range of subjects extending from fundamental research on the tribological characteristics of various multi-phase materials up to final applications of composites in wear loaded, technical components. Besides the emphasis on composites tribology, the great practical aspect of the field in many industrial applications is also reviewed by authors who are engaged in applied research as well as those in more academic activities. The articles in this volume will facilitate both researchers and mechanical designers in their work towards a set of predictive, materials engineering-related models for a more reliable use of composites as tribo-materials. Through the study of, and observation of, the tribology of sensibly formulated composite systems may emerge a clear and more profound understanding of the subject of tribology. In this sense, this book offers a major and critical evaluation of the state of understanding of the principles of tribology and its ability to serve the practical and commercial needs of this technology generally, and particularly in the context of composite systems.
Author: A. Whelan
Publisher: Springer Science & Business Media
ISBN: 9400941838
Category : Technology & Engineering
Languages : en
Pages : 326
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Book Description
Because of the sheer size of the plastics industry, the title Developments in Plastics Technology now covers an incredibly wide range of subjects or topics. No single volume can survey the whole field in any depth and so what follows is therefore a series of chapters on selected topics. The topics were selected by us, the editors, because of their immediate relevance to the plastics industry. When one considers the materials produced and used by the modern plastics industry, there is a tendency to think of the commodity thermoplastics (such as poly(vinyl chloride) or polyethylene); the thermosetting materials are largely ignored. Because of this attitude we are very pleased to include in this volume a chapter which deals with the processing of a thermosetting material, i.e. the pultrusion of glass reinforced polyester. The extrusion of plastics is, of course, a very important subject but an aspect which is often overlooked is the need to remove volatile matter during processing: for this reason we have included a chapter on devolatilisation. Current industrial practice is towards materials modification and this attitude is reflected in the chapters on the transformation of ethylene vinyl acetate polymers and the use of wollastonite in two important thermoplastics. When assessing the performance of materials, there is a tendency to concentrate on short-term mechanical tests and ignore such topics as fatigue and longer-term testing. We are therefore very pleased to include a chapter on this subject.
Author: Sean Garner
Publisher:
ISBN:
Category : Continuum damage mechanics
Languages : en
Pages : 410
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Book Description
The compaction of fine powders offers an attractive means of creating engineered materials; however, there are often difficulties associated with producing compacts with acceptable properties. For example, failures including lamination or capping may occur during compaction and post-compaction processes if a certain level of mechanical strength is not met. Often times, a clear understanding of the cause of the issues leading to inadequate strength is lacking, thus making it difficult to mitigate the potential for failures. There is a strong interest in the availability of tools capable of providing a deeper understanding of the mechanisms responsible for the creation of compacts with adequate strength, as well as tools that can address the criticality of potential defects, and the effect these defects have on final compact properties. The current work focuses on the following: investigating and analyzing crack formation, the development of strength in the powder compaction process, and the generation of relevant predictive models via computational modeling that will allow for process optimization. In an effort to identify the origin and the evolution of damage during the compaction/ejection cycle of powder compacts, an experimental study that compares compacts in straight and tapered dies was performed. Analysis of the presence and growth of microcracks was carried out using x-ray tomography and environmental scanning electron microscopy. The results show the presence of internal microcracks at high relative densities, and microcracks on the surface of the compacts. Parts compacted in tapered dies exhibited microcracks with smaller crack tip openings and had a higher axial strength than those made in a straight die. These experimental observations, together with the ideas of damage generation under compressive stresses, as well as finite element analysis of the stress field in the compact as it exits from the die, confirmed the hypothesis that a two-step mechanism was responsible for damage generation in powder compacts. First, microcracking occurs during unloading within the die at high pressures and subsequently surface cracks grow under the localized stresses as the compact emerges from the die. To further elucidate the behavior of powders in the powder compaction process and the effects that the discrete nature of damage had on strength, this work considered the discrete element method (DEM). For powders compacted to high density, it is crucial that the force-displacement behavior of contacting particles is adequately captured in order to make proper predictions related to damage and strength in compacted components. A new adhesive, elastoplastic contact model, which describes the force-displacement behavior of contacting particles compacted to high density, was introduced and implemented in the DEM. A methodology was developed for the calibration of the model parameters of the proposed model from macroscopic experimental results. This was achieved by the use of statistical design-of-experiments (DOE) and parameter optimization techniques. The proposed DEM contact model was used to assess the ability of the DEM to predict damage and the effect that damage has on strength. A validation study was conducted to assess the ability of the proposed model to adequately predict behavior of powders compacted to high density. DEM simulations of powder compacted in straight and tapered dies were performed. The validation study performed showed excellent agreement with experimental finding for the unloading and ejection of straight and tapered die compacts.
