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Дисертації з теми "Abrasing wear"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Cozza, Ronaldo Câmara. "Estudo do desgaste e atrito em ensaios micro-abrasivos por esfera rotativa fixa em condições de força normal constante e pressão constante." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-26082011-143752/.

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O ensaio de desgaste micro-abrasivo por esfera rotativa vem conquistando elevada aceitação em universidades e centros de pesquisa, sendo amplamente adotado em estudos envolvendo desgaste abrasivo de materiais. Dois modos de desgaste abrasivo podem ser observados neste tipo de ensaio: rolamento resulta quando as partículas abrasivas rolam sobre a superfície do corpo-de-prova, enquanto riscamento é observado quando as partículas abrasivas deslizam sobre o mesmo; o tipo do modo de desgaste abrasivo apresenta uma significante influência sobre o comportamento de um sistema tribológico. Diversos tra

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2

Doan, Yen The. "Experimental investigation and wear simulation of three-body abrasion." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-158239.

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The wear process in three-body contact causes problems of abrasion such as volume loss and changes of geometry of the triboelements. The wear problem leads to increased failure and high costs for repairing or replacing equipment. To understand the nature of the wear behaviour and to predict the wear rate in advance, experimental investigation and numerical simulation of the wear process are required. In this work, the wear process is analysed and the influencing parameters governing the wear behaviour are investigated experimentally to develop a new wear model. Main influential factors are con

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3

OLIVEIRA, Marcelo dos Anjos. "Desgaste abrasivo do aço Hadfield com diferentes teores de carbono em abrasômetro do tipo pino-disco." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18671.

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4

Halley, William G. "Evaluating abrasive wear resistance of extruder tooling materials using the dry sand rubber wheel abrasion test." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42102.

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A series of experiments was performed on groups of samples made from materials currently used to manufacture tooling for extruders to determine if the ASTM G65 dry sand rubber wheel abrasion test could be used as an accelerated test to evaluate candidate materials. Samples were tested in the heat treated condition and after surface modification by plasma ion nitriding. The range of materials tested included medium and high alloy steels and steel bonded carbide composites. The abrasives used were AFS 50/70 test sand and Dresser Glasgrain crushed fused silica. <p>Evaluation of test wear scars an

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5

Cristine, Hedlund, and Alexander Tasevski. "Design of bucket teeth." Thesis, Mälardalens högskola, Innovation och produktrealisering, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-33079.

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For many years, buckets have been equipped with teeth to help penetrate, gouge and breakout materials. The teeth also works as wear parts and can be replaced when they are worn down, and thus increase the service life of the bucket. The first teeth were made like a one-piece design and to replace such tooth required both cutting and welding which was very time consuming. Today’s modern teeth consist of an adapter that is welded on the bucket and a tooth with a locking system that makes it easy to replace the tooth when needed. The teeth on the market today are cast, which means that the hardne

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6

Pereira, Marcio Henrique. "Caracterização do desgaste em punção de forjamento a quente em prensa horizontal automática de múltiplos estágios." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-03082017-095236/.

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Concebido há milhares de anos, o forjamento passa por melhorias contínuas, mantendo-se como um processo de fabricação moderno, capaz de agregar características importantes a produtos forjados que são utilizados em inúmeras aplicações. Na indústria automobilística, responsável pelo consumo de cerca de 60% de todos os produtos forjados, o forjamento mostrou-se como um processo de conformação plástica eficaz no atendimento das especificações de resistência mecânica e nos quesitos de produtividade. Esta demanda por produtos forjados estimulou a busca por processos mais robustos, nos quais as ferra

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7

Cozza, Ronaldo Câmara. "Estudo do comportamento do coeficiente de desgaste e dos modos de desgaste abrasivo em ensaios de desgaste micro-abrasivo." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-31032008-101929/.

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Esta Dissertação tem por objetivo estudar o comportamento de diferentes materiais sob a ação de desgaste micro-abrasivo. Como parte do trabalho, foi projetada e construída uma máquina de ensaio desgaste por micro-abrasão por esfera rotativa fixa, com configuração mecânica com diferenças em relação às observadas na literatura (Gee et al., 2005). Como corpos-de-prova, foram utilizadas pastilhas intercambiáveis de metal duro (classe P20) e aço ferramenta M2. As esferas foram de aço AISI 1010 cementado e aço AISI 52100 temperado e revenido. Durante os ensaios, foi inserida entre a esfera e o corpo

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8

Eve, R. W. "The abrasive wear of carbon materials." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377203.

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9

Wang, Aiguo. "Abrasive wear of metal matrix composites." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305516.

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10

Jewell, Gavin. "Three-body abrasive wear of materials." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/7669.

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Includes bibliographical references.<br>This work is an investigation into the phenomenon of three-body abrasive wear. A specially designed three body abrasive wear apparatus has been built, modified and evaluated as part of this overall study. Further, a series of commercially available candidate materials has been evaluated for wear resistance using silica sand as the abrasive on this purpose made rig. The effect of normal load, abrasive particle size, abrasive feed rate and the type of abrasive on three body wear resistance has also been examined. It has been shown that there is little incr

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11

Huang, Siyu. "Abrasive Wear of Advanced Engineering Materials." Thesis, The University of Sydney, 2019. http://hdl.handle.net/2123/20863.

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The mining and mineral processing industries always suffer serious working environments. Thus, the service life of facilities and parts used in these industries are frequently limited by the harsh environmental erosion and abrasion wear. In the last few decades, Hadfield steels, martensitic steels and white cast irons have been widely used in the ball mill industry. However, the worn-out components and equipment maintenance still cost a significant economic loss due to their relatively low wear resistance. This thesis aims to develop new high-performance Hadfield steel based composite material

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12

Gomes, João Jorge de Faria. "Identificação em processo de mecanismos de desgaste de rebolos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-20032017-113947/.

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O objetivo deste trabalho é o desenvolvimento de um sistema de monitoramento capaz de identificar em processo o mecanismo de desgaste ao qual o rebolo está sendo submetido durante a retificação. Assim, inicialmente foram pesquisados os meios físicos, os tipos de sensores e estratégias utilizadas nos sistemas de monitoramento, o estágio atual de desenvolvimento e suas aplicações. Para que este sistema seja confiável e eficiente foi necessário estudar detalhadamente a fenomenologia dos mecanismos de desgaste do rebolo. Este estudo permite definir parâmetros para identificação do tipo de desgaste

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13

Pontel, Henrique Ferreira. "Estudo do desgaste abrasivo e propriedades mecânicas de um aço Hardox 500 soldado por MAG convencional." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/156494.

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Os aços Hardox possuem microestrutura de martensita revenida e são caracterizados pelas elevadas dureza e resistência à tração, sendo empregados em situações que requerem alta resistência ao desgaste. Entretanto, os processos de soldagem alteram significativamente a sua microestrutura e propriedades. Assim, o objetivo deste estudo foi avaliar a resistência ao desgaste de juntas soldadas de um aço Hardox 500 produzidas através do processo MAG convencional e, juntamente, com o Hardox sem soldagem (metal base), para comparação. A soldagem ocorreu utilizando dois consumíveis, um recomendado pela e

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14

Chinyamakobvu, Oswald Simbarashe. "Metal matrix composites for abrasive wear resistance." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/46998.

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15

Dube, Nokuthula. "Aspects of wear by free abrasive particles." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615027.

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16

Qi, Hang 1971. "Mechanics of abrasive wear of elastomeric materials." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29994.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.<br>Includes bibliographical references.<br>Elastomeric materials are widely used as tire and sealing materials due to their ability to undergo large deformations and conform to the mating surface. However, their applications often result in repeated contact with abrasive particles, which act to abrasively wear the elastomers. Elastomeric materials are observed to exhibit a characteristic form of abrasive pattern on the surface after cyclic scratching. The dimension of this pattern is closely related

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17

Quirke, SJ. "Abrasive wear testing of steels in soil." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/21798.

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Bibliography: pages 133-136.<br>A survey has been made of the quality and type of materials used for tillage tools in South Africa. Conclusions have been drawn regarding the inadequacy of the manufacturing processes used and the resultant quality of the tool material. A rig has been designed for the abrasion testing of materials in soil. The reproducibility of the method has been shown to be high and an evaluation has been made of the relative wear resistance of a series of ·heat treated steels. A medium carbon boron steel has been shown to have great promise as a tillage tool material because

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18

Wei, Gang. "Development of an abrasive wear resistance test and the study of correlation between two-body and three-body abrasive wear." Thesis, Queensland University of Technology, 1991. https://eprints.qut.edu.au/36472/1/36472_Gang_1991.pdf.

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In this study, a standardized coal abrasive wear resistance (AWR) test has been developed by utilizing a modified YGP test rig (initially developed by Yancey, Geer and Price) and the manufacture of a specified abrasive (CB-Ql abrasive). The later was developed to meet standardized test requirements since coal was not adequate for this purpose. The standardized A WR test was then used to test an as-cast and heat treated 3.5C5Cr5Mo5V white cast iron - an experimental abrasive wear resistant material. To evaluate the ranking ability of the test and to study the three-body wear mechanisms

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19

Jungedal, m. "Mild impact wear in a concrete mixer : An evaluation of wet abrasive wear." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161557.

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The concrete mixer industry is affected by abrasive wear under both dry and wet conditions. An upgrade of the material inside the drums to high abrasion resistant steel grades can improve the lifetime and offer the possibility to reduce the weight of the drum. A new wear testing apparatus was designed to simulate the wear conditions in a concrete mixer truck with the aim to investigate the relative wear resistance for a number of steel grades. Three tests were performed under wet conditions using 16-25 mm crushed granite. The tests focused on the wear resistance under sliding and impact wear f

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20

Riofano, Rosamel Melita Muñoz. "Efeito das variáveis de nitretação por plasma na resistência à abrasão de um aço \"maraging\"." Universidade de São Paulo, 1997. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-16092016-113006/.

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Visando-se a avaliação do desempenho de um sistema de nitretação por plasma que se construiu bem como a determinação da influência das variáveis do processo sobre o desempenho das camadas nitretadas ionicamente, foram nitretadas amostras do aço \"maraging\" com a seguinte composição: Fe - 18Ni - 4.2Mo - 12.3Co - 1.7Ti - 0.15Al - 0.03C. Foram variadas as seguintes condições de processo: tempo, temperatura, freqüência do pulso e condição de tratamento térmico prévio. Foram realizadas análises metalográficas, difração de raios-X, microdureza e ensaios de abrasão do tipo \"pino-sobre-disco\" para

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21

Dias, Marcia Fernanda Martins. "Avaliação dos parâmetros de soldagem na resistência ao desgaste abrasivo de revestimentos duros." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-20092016-113125/.

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Este trabalho apresenta uma análise das condições de soldagem sobre o desgaste abrasivo de um revestimento duro. O revestimento foi feito pela deposição metálica por arco submerso variando os parâmetros de soldagem e utilizando fluxos comerciais. Foram utilizados dois conjuntos de parâmetros de soldagem (conjunto 01 com velocidade de soldagem de 55 cm/min, extensão do eletrodo de 35,0 mm, tensão de 30V, corrente de 450A e o conjunto 02 com velocidade de soldagem de 50 cm/min, extensão do eletrodo de 25,5 mm, tensão do arco de 26V e corrente de 440A) e quatro fluxos comerciais (identificados co

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22

Giarollo, Daniela Fátima. "Influência do metal de adição na resistência ao desgaste abrasivo de dois aços estruturais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/178798.

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O presente trabalho teve por objetivo realizar ensaios de desgaste abrasivo em juntas soldadas pelo processo MAG, em dois aços estruturais de alta resistência e baixa liga utilizados no transporte ferroviário de minério, os quais apresentavam diferentes propriedades mecânicas. No aço de menor resistência (Aço A) foram utilizados os metais de adição AWS ER70S-G (Aço A-70) e AWS ER80S-G (Aço A-80), enquanto no aço de maior resistência (Aço B) os metais de adição AWS ER80S-G (Aço B-80) e AWS ER110S-G (Aço B-110). Os conjuntos soldados foram caracterizados quanto às suas microestruturas, dureza e

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23

Mouritz, Adrian Paul. "The abrasive wear of rock drill bit materials." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315846.

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24

Allsopp, D. N. "Abrasive wear of bulk materials and hard coatings." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595477.

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Thin coatings and other surface engineering techniques are widely used to improve the friction and wear properties of surfaces. However, current understanding of the behaviour of surfaces is relatively poor. Production methods are therefore to a large extent based upon empiricism. Many well-established materials characterisation tests are inadequate, and so novel techniques for the examination of surface layers have emerged, with the eventual aim of predicting the tribological performance of surfaces. One such technique is the micro-scale abrasive wear test, in which a ball is rotated against

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25

Mashloosh, K. M. "Abrasive wear with particular reference to digger teeth." Thesis, Brunel University, 1987. http://bura.brunel.ac.uk/handle/2438/7883.

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Abrasive wear occurs when a contact associated with stress between a metal surface and a herd particle (frequently of mineral origin) leads to friction between the two. In a very wide range of industrial applications, abrasive wear is the main reason for component and equipment repair or replacement. In most of these applications, especially those of earth moving, construction and mining equipment, digger teeth are used to improve equipment performance. Digger teeth can be produced in different shapes and sizes (mainly by casting) and a wide range of materials are used. This project is concern

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26

Sole, Brian Michael. "The abrasive wear behaviour of mineral-filled polypropylene." Doctoral thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/9545.

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Bibliography: leaves 170-179.<br>Polypropylene is an extremely versatile polymer because its properties can be modified to meet specific requirements. The use of polypropylene in domestic and automobile applications has initiated research focused on the tribological behaviour of the material. In the present study, polypropylene grades have been subjected to both mild and severe abrasive wear conditions with specific emphasis on the surface property of scratch resistance. The experimental work has covered the effect of polymer crystallinity, mineral fillers, and the nature of the abrasive count

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27

Eugenio, Cantú Gómez David. "Abrasive wear of hard faced ground engaging tool." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218017.

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Ground engaging tools are very important components of machinery for agricultural applications, such as soil tillage. Ploughshare points serve as the first point of contact between ploughs and the hard minerals in the soil. One of the biggest problems that these tools encounter is abrasive wear, which decreases tillage quality, causes frequent tillage stops, increases fuel consumption of the tractor, and results in soil erosion. During this investigation, wear measurement, surface profiling and microscopic analysis were performed on three share point samples running in silica and granite sand

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28

Stevenson, Anthony Nicholas James. "Wear and microstructure of weld-hardfacing deposits of high chromium white cast irons." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243064.

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29

Adeva, Rodil Teresa. "Edge effect on abrasive wear mechanisms and wear resistance in WC-6wt.% Co hardmetals." Thesis, Karlstad University, Division for Engineering Sciences, Physics and Mathematics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-375.

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<p>Wear of hardmetals is a complicated topic because the wear resistance and the wear mechanisms are influenced by microstructural factors. Although edge wear resistance has a vital importance, most of the researches made in laboratories are related to flat wear resistance using coarse abrasive paper. This situation produces problems with the prediction of abrasive wear behaviour and with the estimation of the lifetime of cutting edges of different kinds of tooling.</p><p>Several studies have been done in order to clarify edge wear behaviour. It has been published correlations of the edge toug

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30

Toth-Antal, Bence Materials Science &amp Engineering Faculty of Science UNSW. "Development of copper-alumina composites for abrasive wear applications." Awarded By:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/44504.

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Copper-alumina composites were developed for testing in abrasive wear applications. The composites featured a porous continuous ceramic-preform network infiltrated by a liquid metal to form the final consolidated composite. The liquid metal phase was pure copper. Six different ceramic preform variants were tested. Ceramic volume fractions of 40, 50 and 60% were used, of two preform types; one pure-alumina, and one with additional 2wt% copper(I) oxide (CU20), functioning as an infiltration aid, the effects of which were determined in a previous study; the copper-oxide reduced infiltration pres

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31

Merino, Jose Luis Ortiz. "Microstructural development and abrasive wear of alumina/SiC nanocomposites." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393376.

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32

Meyer-Rödenbeck, G. D. "An abrasive-corrosive wear evaluation of some aluminium alloys." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/18784.

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This investigation evaluates the abrasive-corrosive wear behaviour of aluminium alloys with the aim of establishing a data base of performance and guide lines for material optimisation. Wear test apparatus and standard tests developed by previous research programmes were utilised (Noel and Allen, 1981; Barker, 1988). Further tests were then devised for a more detailed characterisation of wear behaviour. Tests conducted showed that aluminium alloys have approximately a quarter to half the abrasion resistance of mild steel. Poor microfracture properties of Al-Si cast alloys were observed as a re

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33

Shepperson, S. V. "The abrasive wear resistance of austempered spheroidal graphite irons." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/17647.

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Bibliography: pages 103-107.<br>A study has been made of the structure and abrasive wear resistance of two austempered commercial spheroidal cast irons. Heat treatments have been carried out for different times between 2 and 120 minutes for a range of austenitising temperatures between 850°C and 950°C and austempering temperatures between 250°C and 450°C. The morphology and constitution of the resulting dual phase ferrite/austenite structure has been examined using optical and scanning electron microscopy and x-ray analysis. The maximum quantity of retained austenite in the structure has been

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34

Conroy, Ashley Paul. "The development of a high stress abrasive wear tester." Thesis, Queensland University of Technology, 1992.

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35

Halim, Mahdi Hassan. "Truck tyre tread rubber : compounding and abrasion resistance." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/6743.

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36

Andrade, Gustavo Tressia de. "Resistência à abrasão de aço Hadfield para britadores: efeito do tamanho do abrasivo e do pH do meio." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-11072016-102946/.

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Neste trabalho, foi investigado o efeito do tamanho do abrasivo e do pH do meio na resistência ao desgaste abrasivo do aço H-13 com matriz martensítica e do aço Hadfield com matriz austenítica. Ensaios de abrasão foram realizados utilizando o equipamento roda de borracha a úmido, variando o tamanho do abrasivo entre 0,15 e 2,40 mm e o pH do meio entre 5,5 e 12,8. As microestruturas dos materiais estudados foram analisadas utilizando microscopia óptica, as superfícies de desgaste e as partículas de desgaste foram analisadas em microscópio eletrônico de varredura. A macrodureza e a microdureza,

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Agudelo, Juan Ignacio Pereira. "Analysis of the microstructure transformation (wel formation) in pearlitic steel used in relevant engineering wear systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-04092018-131559/.

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In this thesis, the behavior of pearlitic steel was characterized under controlled wear conditions in the laboratory and service conditions in two ore mining stages, comminution and transportation. The thesis consists in three experimental chapters, divided according to the tribosystems analyzed. On all the chapters Electro Microscopy techniques for the microstructural analysis were employed. Scanning Electron Microscopy (SEM), Focused Ion Beam (FIB-SEM), Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) were used. The first experimental chapter shows the anal

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38

Ferreira, Renata Prata. "Estudo do efeito da força, do módulo de elasticidade e do envelhecimento termomecânico no desgaste abrasivo da borracha de polibutadieno baixo cis." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-19072016-115907/.

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Esta Dissertação de Mestrado tem como Objetivo estudar a influência da tangente delta, envelhecimento termomecânico e força no comportamento de uma borracha de polibutadieno baixo cis perante o desgaste abrasivo através de experimentos em roda de borracha, utilizando planejamento fatorial completo em dois níveis (DOE 2k). A literatura possui muitas informações em relação à força indicando uma relação exponencial com a taxa de desgaste, todavia em relação à tangente delta e ao envelhecimento termomecânico quase não há dados. Ao final do trabalho foi possível verificar que todos os fatores estud

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Machado, Paulo Cordeiro. "Análise multiescala da abrasão de aços austeníticos ao manganês aplicados em britadores de minério." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-28112017-073503/.

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O desgaste abrasivo de dois aços austeníticos ao manganês, materiais com grande utilização na mineração, foi estudado empregando metodologia multiescala (escalas: macro, meso e micro). Na macroescala foram estudados os mecanismos de dano e de desgaste de revestimento de britador utilizado em campo. Na mesoescala foram realizados ensaios de britador de mandíbula e de esclerometria linear. Na microescala o ensaio de esclerometria linear foi utilizado para avaliar os efeitos da camada encruada em campo e da orientação cristalográfica dos grãos austeníticos dos aços com 12 %Mn e 20 %Mn. As técnica

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Parsons, Ethan M. (Ethan Moore) 1972. "Micromechanics of deformation and abrasive wear of fiber-filled elastomers." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9259.

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Includes bibliographical references (leaves 165-167).<br>Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.<br>The abrasive wear of unfilled and fiber-filled elastomers was studied both with experiments and with finite element simulations. Wear experiments with elastomer seals exhibited two distinct regimes: an initial, "break-in" period followed by an "aggressive wear" period. During the break-in period, few abrasive particles are able to penetrate the seal's contact band, and no substantial seal wear occurs. During the aggressive wear period, abrasiv

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Sandoval, Joseph (Joseph Alexander). "Modeling abrasive wear of a 3D printer extruder drive mechanism." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105674.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 51).<br>Additive manufacturing, more specifically 3D printing using fused filament fabrication (FFF), is a valuable technique; however, little has been done in developing a new mechanism for driving filament through the hot end of the 3D printer. This investigation focuses on a prototype extruder mechanism that utilizes two counter rotating motors to force filament through the nozzle. The plastic passes through th

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42

Pettersson, Simon. "Investigation of Finite Element Modelling of Abrasive Wear in Polymers." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-36899.

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Scheffler, O. "The influence of steel microstructure on abrasive wear in soils." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/17646.

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Bibliography: pages 96-104.<br>A hypoeutectoid steel has been heat treated to produce a range of different hardnesses and microstructures. A simulative field test rig has been employed to determine the relationship between microstructural parameters, material properties and soil constitution. Attempts have been made to correlate the ranking order for the wear resistance of similar treated steels in field and laboratory tests. It has been established that wear resistance is a function of soil constitution, steel carbide morphology and hardness. Explanations have been advanced for the difference

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Corder, Glen David. "The failure properties and abrasive behaviour of sand in hoppers." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292940.

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Olsson, Sara, and Linn Efsing. "Wear testing of high-alloy carbon steel used in mining tools." Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124595.

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Wear is a commonly occurring degradation mechanism for materials and components in the rock drilling industry. The wear can occur by either abrasion or adhesive wear. Further corrosion and presence of water or other lubricating fluids with or without particles may influence the behavior. Which mechanism, or mechanisms, and under which conditions it occurs, as well as the relative wear rate is dependent on the actual operating conditions for the component. In the present study, commonly available and general test methods for wear on high-alloy carbon steel has been analyzed. The project has bee

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Tam, Anlam Chi Lam. "Abrasive wear properties of ceramic particulates (Al₄C₃) reinforced al-based composites." access abstract and table of contents access full-text, 2002. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175068a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2002.<br>At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials technology and management dissertation. Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.

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Vendrame, Saimon. "Integridade superficial do aço-rápido AISI M3:2 após o processo de retificação /." Bauru, 2019. http://hdl.handle.net/11449/191113.

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Orientador: Eduardo Carlos Bianchi<br>Resumo: Aços-rápidos são materiais que exibem elevada resistência ao desgaste abrasivo, aliada a uma tenacidade relativamente alta, propriedades estas que os tornam adequados para se fabricar ferramentas de corte. Grande parte de suas propriedades se deve a presença de carbonetos na microestrutura. Ao mesmo tempo que estas propriedades mecânicas são favoráveis para a utilização como ferramentas, tornam-se desafios na sua fabricação. O processo de retificação é empregado nas últimas etapas de fabricação de ferramentas de corte como machos e brocas e a prese

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Silva, Joélson Vieira da. "Estudo da influência do tratamento térmico de austenitização seguida de resfriamento ao ar forçado na resistência ao desgaste abrasivo do ferro fundido branco ASTM A532 II D." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/170956.

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O objetivo desta pesquisa é realizar um estudo sobre o desgaste abrasivo do ferro fundido branco alto cromo de acordo com a norma ASTM A532 II D, submetidas à diferentes faixas de temperatura de austenitização, decompondo a faixa de 950 a 1.150 ºC, amplamente usada nas fundições, em intervalos de 50 ºC. Esta liga foi escolhida para estudo em virtude de sua extensa aplicação na indústria de mineração, possuindo como principal característica a utilização em revestimentos de moinhos e martelos de britadores, onde a resistência ao desgaste abrasivo é exigida. Os corpos de prova foram caracterizado

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Fasahat, F., R. Dastjerdi, and M. R. M. Dastjerdi. "Abrasion Resistance of Ag/SiO2/PA6 Nanocomposite Fabrics." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35638.

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In recent decades, polymeric nanocomposites have been widely used in chemical, automobile and aero industries due to their low weight and smoothness. Abrasion resistance is a vital property in variable ap-plications of polymeric composites. Here, to investigate the wear resistance of nylon 6 nanocomposite fab-rics, melt spun yarns were filled with different concentrations of Ag/SiO2 nanoparticles and the wear prop-erties of weft knitted nanocomposite and pure samples were evaluated. Results disclosed that the wear re-sistance of composite fabrics containing nano-particles increased considerabl

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Stewart, David. "Studies on the abrasive wear behaviour of HVOF WC-Co coatings." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287076.

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