Relevant bibliographies by topics / Surfaces (Technology) Mechanical wear

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Academic literature on the topic 'Surfaces (Technology) Mechanical wear'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Surfaces (Technology) Mechanical wear"

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Dunaevsky, V. V. "Measurement of Local Microscopic Wear." Journal of Tribology 108, no. 1 (January 1, 1986): 35–41. http://dx.doi.org/10.1115/1.3261140.

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A method for determining a linear wear comparable to a surface roughness height is described here. The method allows estimation of the wear by results of profilometry of the worn surface only. The formulas presented provide wear evaluation for surfaces modeled by Gaussian random fields. The method simplifies the technology of precise wear measurements, improves their accuracy, and increases the availability of profilometrical ways of wear analysis.
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Bergseth, E., M. Torbacke, and U. Olofsson. "Wear in environmentally adapted lubricants with AW technology." Journal of Synthetic Lubrication 25, no. 4 (October 2008): 137–58. http://dx.doi.org/10.1002/jsl.57.

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Ciofu, Florin, and Marius Bibu. "Changes of Structure and Physical-Mechanical Properties in Alloy Steels Thermochemically Treated by Plasma Nitriding." MATEC Web of Conferences 343 (2021): 03010. http://dx.doi.org/10.1051/matecconf/202134303010.

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Plasma nitriding is a method of surface modification using a glow discharge technology to introduce nitrogen into the surface of a metal, which subsequently diffuses into the material. The main advantages of plasma nitriding over conventional nitriding processes are: reduced cycle time, controlled growth of the surface layer, elimination of white layer, reduced distortion, no need of finishing, pore-free surfaces and mechanical masks instead of copper plating. The process is especially suitable for complex parts that are intensively solicited by wear, fatigue, contact pressure, shocks, possibly also to corrosion. It is applied in order to bring the metallic products in a state favourable from the point of view of structure, chemical composition and internal stress state. The paper presents an analysis of the structures and characteristics of a widely used structural steel 39 - CrAl6. As a result of plasma nitriding, a surface layer with high wear and fatigue resistance was created on the surface of the material. Also, between the surface layer and the base material was interposed a hard substrate with high wear resistance having a bainitic / martensitic structure.
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XU, JIANG, FENG WANG, and ZILI LIU. "INVESTIGATION OF THE TRIBOLOGY BEHAVIORS OF AUTO-RESTORATION ADDITIVE UNDER HEAVY LOADING CONDITIONS." Surface Review and Letters 14, no. 02 (April 2007): 329–34. http://dx.doi.org/10.1142/s0218625x07008998.

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Lubricant additives are crucial in minimizing friction and wear, and protecting surfaces under severe contact condition. The traditional additive can only diminish the wear rate of materials by increasing the sliding distance. As a wear-self-compensation lubricating additive, the auto-restoration technology (ART) of worn surface of metals is a novel technique for the repair of mechanical equipment and breakthrough of tribology theory that cannot obey the traditional law. The previous experiments have measured the friction and wear behaviors of ART additives under low load conditions. This paper presents the tribology behaviors of auto-restoration lubricating additive under heavily loaded condition. The results show that the auto-restoration lubricating additive can reduce pronouncedly the frictional coefficient and wear weight; after 6 h wear examination the friction coefficient is only 0.027. The morphology of the worn surface and the chemical composition of tribofilm have been observed by SEM. It proved that the worn surface is very smooth and there exists a tribochemical reaction between the metal and the auto-restoration lubricating additive.
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Суслов, Анатолий, Anatoliy Suslov, Олег Федонин, Oleg Fedonin, Олег Горленко, Oleg Gorlenko, Михаил Шалыгин, Mikhail Shalygin, Леонид Захаров, and Leonid Zakharov. "Innovation technologies in mechanical engineering ensuring life increase of railway wheels and rails." Science intensive technologies in mechanical engineering 2019, no. 7 (July 1, 2019): 3–8. http://dx.doi.org/10.30987/article_5cf7bd2f83f6b5.55900953.

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In the paper it is shown that railway wheels and rails life depends considerably upon wear-resistance of their tread working surfaces. There is presented an innovation technology of a railway wheel tread electromechanical processing allowing the increase of its life. The innovation technology of railway wheel working tread electromechanical processing allowing its life increase is shown. The innovation technology for rail working tread allowing its life increase is given.
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Yong, Zhang, Qi Bo, and Sun Xinxin. "The application of ceramic technology in spherical pipe joints." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 8 (February 2, 2017): 1078–88. http://dx.doi.org/10.1177/1350650117692660.

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Spherical pipe joints are prone to cold welding and wear, which may lead to seal failure under extreme conditions. To solve this problem, the application of ceramic technology in the spherical pipe joints is discussed in this paper. Both numerical simulations and experiments were performed for different types of coating material and different coating thicknesses. The results have demonstrated that the application of a ceramic coating could improve the sealing performance of spherical pipe joints. However, the performance was even better when a fully ceramic cone was used instead. Under the same initial torque, the number of usage cycles was much higher for the fully ceramic cone than for the coated cone, and abrasive wear was very slight. The results are expected to serve as reference for improving the sealing performance of spherical pipe joints.
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Yamaguchi, E. S., M. Untermann, S. H. Roby, P. R. Ryason, and S. W. Yeh. "Soot Wear in Diesel Engines." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 220, no. 5 (May 1, 2006): 463–69. http://dx.doi.org/10.1243/13506501j00505.

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In response to regulatory requirements, lubricant manufacturers are seeking oils that minimize soot thickening and the accompanying soot wear. Formulation technology is being developed by additive manufacturers to satisfy these requirements. For example, such work is in progress at Chevron Oronite Company LLC, using the Cummins M-11 exhaust gas recirculation (EGR) engine test as a surrogate for the anticipated soot wear test for PC-10. Simultaneously, the authors developed bench tests to screen candidate formulations and reduce costs. A ball-on-disc sliding wear test, using a PCS Instruments MTM® tribometer, has been investigated. Sliding conditions at high pressure are required for soot polishing wear. Conditions that correlate tribometer test results with M-11 engine results at high soot concentrations (∼9 per cent) have been found. Both ball wear and Stribeck curves were determined in these tests. The high-wear oil progresses from mixed lubrication conditions to boundary lubrication at higher sliding speeds than the low-wear oil. X-ray photoelectron spectroscopy experiments were also conducted on the ball wear scars, revealing differences in the chemical constitution of the tribofilms from the two oils.
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Yang, Zirun, Benguo Zhang, Haiqing Jiang, Haidi Xia, Xinjiang Zhang, and Cuifeng Jiang. "Superior wear performances of one-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy master alloy substrate." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 5 (September 30, 2018): 782–90. http://dx.doi.org/10.1177/1350650118803822.

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One-step forming TiCp/Ni3Al-Ni3Al multi-coating on powder metallurgy 316L stainless steel substrate was fabricated by vacuum hot-pressing sintering technology and its wear performances at different loads and ambient temperatures were investigated. The wear weight loss of TiCp/Ni3Al-Ni3Al multi-coating increased with the increase in the applied load and a mild-to-severe wear transition occurred. Inversely, the coating’s wear weight loss decreased as the ambient temperature increased. The high wear resistance at elevated temperatures was mainly attributed to high work-hardening capacity and high temperature strength of Ni3Al matrix. Besides, the mechanically mixed layer with dispersed TiC particulates prevented the substrate from plastic deformation and thermal softening, which were conducive to improve the wear resistance of the coating.
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Zhang, Hui, Jian Xin Deng, Gui Yu Li, Xing Ai, and Jun Zhao. "Effect of Ambient Temperature on Wear of Cemented Carbide Tool Material." Advanced Materials Research 148-149 (October 2010): 276–79. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.276.

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Cemented carbide has relatively good mechanical properties, so it is widely used as cutting tools. In this paper, a sliding wear test at high ambient temperature between cemented carbide tool material and ceramic was carried out using a ball-on-disc wear-test machine. The characteristics as to wear rate and friction coefficient were investigated. The special wear rate increased with an increase in operating temperature. The cemented carbide material with addition of TiC phase gave better wear resistance than cemented tungsten carbides at elevated temperature. SEM technology was adopted to observe the worn surfaces of specimens and wear mechanism were simultaneously discussed.
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Chavdarov, Anatoliy V., and Aleksey A. Tolkachev. "Restoration of internal surfaces of cylindrical parts of small diameters by cold gas dynamic spraying." Tekhnicheskiy servis mashin, no. 3 (August 20, 2020): 128–36. http://dx.doi.org/10.22314/2618-8287-2020-58-3-128-136.

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Wear of internal surfaces of cylindrical parts of small diameters is a common defect of equipment used in the agro-industrial complex. There are problems with low powder utilization and lack of a design solution for coating the inner surfaces of cylindrical parts with small diameters. (Research purpose) The research purpose is in evaluating the adhesive and cohesive strength and developing a technology for restoring the internal surfaces of cylindrical parts of small diameters by cold gas-dynamic spraying. (Materials and methods) Authors applied the method of cold gas dynamic spraying. The article presents a device for gas-dynamic coating on the inner surfaces of cylindrical parts and determines the optimal deposition modes for powder consumption and heating temperature. A portable DIMET-403 unit, aluminum oxide powder for surface preparation, a-20-11 aluminum powder, and a steel plate were used for the study. The weight was measured on analytical scales with an accuracy of 0.001 grams. Tests were performed on the adhesive and cohesive strength of the coating on cylindrical samples prepared by mechanical processing, under the most favorable conditions with a duration of deposition equal to 60 seconds. Samples were processed after sputtering on a lathe to obtain a cylindrical belt. (Results and discussion) The values of adhesive and cohesive strength of coatings fit into the range of values suitable for operation, and meet the conditions for obtaining a wear-resistant ceramic coating. The article presents a technology for obtaining a sublayer for the manufacture of ceramic wear-resistant surfaces in a pair of friction piston ring-cylinder. (Conclusions) The developed restoration technology of internal surfaces of cylindrical parts of small diameters by cold gas-dynamic spraying solved the problem of their wear.
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Dissertations / Theses on the topic "Surfaces (Technology) Mechanical wear"

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Erdemir, Ali. "A study of surface metallurgical characteristics of tin coated bearing steels." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20134.

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Cai, Shaobiao. "3D numerical modeling of dry/wet contact mechanics for rough, multilayered elastic-plastic solid surfaces and effects of hydrophilicity/hydrophobicity during separation with applications." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1205118488.

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Yen, Yung-Chang. "Modeling of metal cutting and ball burnishing prediction of tool wear and surface properties /." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1073065455.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xxviii, 254 p.; also includes graphics. Includes abstract and vita. Advisor: Taylan Altan, Dept. of Industrial and Systems Engineering. Includes bibliographical references (p. 240-248).
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Calao, Luis Fernando Montañez. "Coeficiente de atrito estático do par aço AISI H13 temperado e revenido e recobrimento de cromo duro: ensaios em plano inclinado." Universidade Tecnológica Federal do Paraná, 2011. http://repositorio.utfpr.edu.br/jspui/handle/1/382.

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Capes
Neste trabalho estudou-se a influência de parâmetros de rugosidade e propriedades mecânicas de um aço AISI H13 no coeficiente de atrito estático, ensaiado no sistema plano inclinado. Como contra corpo foi utilizado um recobrimento de cromo duro, considerado idealmente liso. O coeficiente de atrito foi relacionado com a área real de contato, tendo como dados de entrada parâmetros de rugosidade bidimensionais. A rotina de cálculo proposta por McCool (1987) foi aplicada para obtenção de uma estimativa de área de contato, utilizando os parâmetros Rq (rugosidade média quadrática) e RDq (inclinação média quadrática). Foram estudados três conjuntos de amostras, com acabamento superficial produzido por retificação plana e durezas distintas, produzidas por tratamentos térmicos aos corpos de prova. A variação da dureza foi obtida por meio de diferentes temperaturas de duplo revenimento: 540, 600 e 640 °C. Os ensaios de plano inclinado foram conduzidos em uma velocidade de 0,33°/s e uma carga aplicada produzida pelo peso próprio da amostra. Um sensor de movimento é acoplado ao equipamento para detectar o início do deslizamento e permitir a medida de ângulo neste instante. Para análise dos resultados, cada conjunto de amostras foi considerado como sendo diferente em função do tratamento térmico. Além disso, subconjuntos de amostras foram distinguidos em função do parâmetro Rq, por se tratar de um parâmetro médio e que é utilizado diretamente no cálculo da área real de contato. Dessa forma, para cada condição metalúrgica, pode-se verificar a variação do coeficiente de atrito estático com as propriedades mecânicas e superficiais. Foi verificado que, a dureza não apresentou influência no coeficiente de atrito estático, porem, a combinação das propriedades mecânicas e superficiais representada pelo índice de plasticidade apresenta uma relação direta.
In this work was studied the influence of roughness parameters and mechanical properties of the steel AISI H13 in the coefficient of static friction tested in the inclined plane method. The counterbody used was a coating of hard chrome, considered ideally smooth. The coefficient of friction was related to the real area of contact, taking as input bi-dimensional roughness parameters. The routine calculation proposed by McCool (1987) was applied to obtain an estimate of contact area, using the parameters Rq (root mean square roughness) and Rdq (mean square slope). Three sets of samples were studied, with surface finish produced by grinding flat and different hardness, produced by heat treatments to the samples. The variation of hardness was obtained by different double tempering temperatures: 540, 600 and 640 ° C. The inclined plane tests were conducted at a speed of 0.33 °/s and an applied load produced by the self weight of the body. A motion sensor is attached to the equipment to detect the onset of slip and allow the measure of angle instantly. To analyze the results, each set of samples was considered different depending on the heat treatment. In addition, subsets of samples were distinguished in accordance with Rq parameter, because it is an average parameter and it is used directly to calculate the real area of contact. Thus, for each metallurgical condition was possible to see, the variation of the coefficient of static friction with mechanical and surface properties. It was verified that the hardness had no effect on the coefficient of static friction, however, the combination of mechanical and surface properties represented by the plasticity index has a direct relationship.
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Ayyagari, Venkata A. "Surface Degradation Behavior of Bulk Metallic Glasses and High Entropy Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062863/.

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In this study, the surface degradation behavior was studied for typical examples from bulk metallic glasses (BMGs), metallic glass composites (MGCs) and high entropy alloys (HEAs) alloy systems that are of scientific and commercial interest. The corrosion and wear behavior of two Zr-based bulk metallic glasses, Zr41.2Cu12.5Ni10Ti13.8Be22.5 and Zr57Cu15.4Ni12.6Al10Nb5, were evaluated in as-cast and thermally relaxed states. Significant improvement in corrosion rate, wear behavior, and friction coefficient was seen for both the alloys after thermal relaxation. Fully amorphous structure was retained with thermal relaxation below the glass transition temperature. This improvement in surface properties was explained by annihilation of free volume, the atomic scale defects in amorphous metals resulting from kinetic freezing. Recently developed MGCs, with in situ crystalline ductile phase, demonstrate a combination of mechanical properties and fracture behavior unseen in known structural metals. The composites showed higher wear rates but lower coefficient of friction compared to monolithic amorphous glasses. No tribolayer formation was seen for the composites in sharp contrast to that of the monolithic metallic glasses. Corrosion was evaluated by open circuit potential (OCP) analysis and potentiodynamic polarization. Site-specific corrosion behavior was studied by scanning vibration electrode technique (SVET) to identify formation of galvanic couples. Scanning kelvin probe microscope was used to map elecropositivity difference between the phases and linked to wear/corrosion behavior. Phases with higher elecropositivity were more susceptible to surface degradation. Wear and corrosion synergy in marine environment was evaluated for two high entropy alloys (HEAs), CoCrFeMnNi and Al0.1CoCrFeNi. Between the two alloys, Al0.1CoCrFeNi showed better wear resistance compared to CoCrFeMnNi in dry and marine conditions due to quicker passivation, a higher magnitude of polarization resistance and significantly larger pitting resistance.
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Aguiar, Herbert César Gonçalves de. "Contribuição ao estudo do torneamento do aço inoxidável superduplex empregando ferramentas de metal duro com revestimentos." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264548.

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Orientador: Amauri Hassui
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-21T02:22:26Z (GMT). No. of bitstreams: 1 Aguiar_HerbertCesarGoncalvesde_M.pdf: 11222250 bytes, checksum: a22406ca3de132e13522314dd3490816 (MD5) Previous issue date: 2012
Resumo: Os aços inoxidáveis superduplex são materiais de estrutura bifásica contendo ferrita e austenita, que garantem ao material boa resistência à corrosão por pitting, resistência mecânica e outras características que tornam o material atrativo para as indústrias: petrolífera, óleo/gás, papel/ celulose e química. As mesmas características que tornam o aço inoxidável superduplex mais resistente dificultam a sua usinagem. Portanto, a definição dos parâmetros de usinagem deve atender ao compromisso de por um lado garantir alta produtividade e por outro não comprometer as características do material na sua aplicação. O presente trabalho consiste no torneamento com lubrificação do aço inoxidável superduplex, variando os parâmetros de usinagem e utilizando ferramentas de metal duro da classe M05-M20 revestidas com TiN/Al2O3/TiCN, Al2O3/TiCN e TiAlN, com o objetivo de investigar os efeitos dos parâmetros de usinagem sobre o mecanismo de desgaste da ferramenta através de micrografias obtidas por microscopia eletrônica de varredura (MEV) e de micro-análise semi-quantitativa através do sistema de espectroscopia de energia dispersiva (EDS), a tensão residual induzida no material usinado medida por difração raio-X e a rugosidade na peça. As análises do desgaste da ferramenta mostraram a predominância do mecanismo de adesão/attrition com surgimento de entalhe causado pelo martelamento da rebarba gerada no cavaco durante o torneamento. Isso por sua vez contribuiu ainda mais com a adesão dificultando a remoção do material que aumentou os esforços de corte gerando tensões residuais superficiais compressivas. A ferramenta revestida com TiN/Al2O3/TiCN se destacou por apresentar melhor resultado em termos de vida da ferramenta e menores tensões residuais superficiais de tração no início de vida da ferramenta em relação às ferramentas revestidas com TiAlN e Al2O3/TiCN. A condição de vc = 80 m/min e f = 0,4 mm/rev se destacou dentre todas as classes testadas em termos de produtividade. No entanto, o f = 0,4 mm/rev é prejudicial à integridade superficial gerando tensões trativas e maiores rugosidades
Abstract: The super duplex stainless steels are materials of biphasic structure containing ferrite and austenite, which guarantee a good pitting corrosion resistance, mechanical resistance and other characteristics that make the material attractive to industries: petroleum, oil/gas, paper/cellulose and chemical. The same characteristics that make the super duplex stainless steel more resistant make its machining more difficult. Therefore, the definition of machining parameters should comply with the commitment on the one hand of guaranteeing high productivity and on the other of not compromising the characteristics of the material in its application. This work consists on the turning with lubrication of the super duplex stainless steel, varying the machining parameters and using carbide tools of the grade M05-M20 coated with TiN/Al2O3/TiCN, TiAlN and Al2O3/TiCN, with the objective of investigating the effects of the machining parameters over the tools wear mechanism was also analyzed through micrographs obtained by scanning electron microscopy (SEM) and by semi-quantitative micro-analysis through the system energy dispersive spectroscopy (EDS), the residual stress induced into machined material measured by X-ray diffraction and the parts roughness. The tool wear analysis showed a predominance of the adherence/attrition mechanism with the appearance of grooves caused by the hammering of the burr generated in the chip during the turning. This, in its turn, contributed even more with the adhesion, making it difficult to remove the material which increased the effort in cutting, generating superficial compressive residual stress. The tool coated with TiN/Al2O3/TiCN highlighted itself for presenting better result in terms of the life of the tool and lower surface residual stresses of tensile at the beginning of tool life in relation to the tools coated with TiAlN and Al2O3/TiCN. The condition of vc = 80 m/min and f = 0,4 mm/rev highlighted itself among all the tested classes in terms of productivity. However, the f = 0,4 mm/rev is prejudicial to the superficial integrity, generating tensile stress and greater roughness
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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Spencer, Andrew. "Optimizing surface texture for combustion engine cylinder liners." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17001.

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The Piston Ring - Cylinder Liner (PRCL) contact is the single largest contributor to frictional losses in an internal combustion (IC) engine, causing 20-40% of all mechanical losses. If these mechanical losses can be reduced by 10% then vehicle fuel efficiency could be increased by approximately 1.5-2.5%. In todays automotive industry fuel efficiency is one of the most important factors in vehicle design due to increasing concerns about energy security, increasing fuel prices and climate change. The objective of this project is to optimise the cylinder surface texture, which when referring to cylinder liners in this work means the cross-hatch grooves left by the honing process.This work focuses on simulation techniques that can be used to help optimize cylinder liner surface texture to reduce friction while at the same time minimizing oil consumption and wear. Cylinder liner surface topography is investigated with a range of measurement techniques in order to reveal all the important features of the existing surface. Different ways of characterizing surface topography based on both traditional height averaging parametersand functional parameters calculated for a range of different surface measurements are discussed. The different characterization techniques are compared to find the most appropriate way of quantitatively describing surface topographies.A full engine cycle simulation of the PRCL contact has been developed. A homogenization technique was implemented for solving the Reynolds equation. This is a two scale approach where surface roughness is treated on the local scale and surface texture plus global geometry on the global scale. A method for generating artificial surface topography based on real surface measurement data was developed. This allows for the possibility of simulating a wide range of new surface topographies in order to investigate their potential for reducing friction and minimising oil consumption and wear.
Godkänd; 2010; 20101115 (spencer); LICENTIATSEMINARIUM Ämnesområde: Maskinelement/Machine Elements Examinator: Professor Roland Larsson, Luleå tekniska universitet Diskutant: Professor Michel Cervantes, Luleå tekniska universitet Tid: Fredag den 17 december 2010 kl 13.00 Plats: E231, Luleå tekniska universitet
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Campos, José Alexandre de. "Avaliação experimental do desgaste de canto durante o processo de eletroerosão do AISI H13." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1165.

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A fabricação de moldes e matrizes são ricas em detalhes e geometrias complexas, exigindo tecnologias mais inovadoras e precisas. Um dos processos que se destaca na fabricação de moldes e matrizes, é o de eletroerosão por penetração (Electrical Discharge Machining - EDM). A usinagem por descargas elétricas é classificada como um processo de fabricação de geometria não definida, onde a remoção de material é realizada por repetidas descargas elétricas entre dois eletrodos eletricamente condutores. O desgaste da ferramenta é um dos principais parâmetros de medida no desempenho da usinagem por EDM. O maior problema ocasionado pelo desgaste de canto do eletrodo é a mudança de geometria da ferramenta no decorrer da usinagem, alterando a tolerância geométrica e o dimensional da cavidade. O presente trabalho propõe avaliação dimensional do desgaste de canto do eletrodo, no decorrer da usinagem do processo de EDM, variando o ângulo de superfície frontal do eletrodo. Outro propósito é a criação de um índice, chamado de taxa de arredondamento, que leva em consideração as áreas de desgaste de canto do eletrodo em função da área removida de material da peça. Os resultados mostraram que os eletrodos de cobre, cobre tungstênio e grafite, tem um grande crescimento de raio de canto no inicio da usinagem, estabilizando esses valores com tempo maiores de processo. O ângulo de superfície frontal do eletrodo influência diretamente no desgaste de canto do eletrodo. Os eletrodos de grafite não apresentaram comportamento de arredondamento de desgaste de canto durante os ensaios. Para o índice de taxa de arredondamento os eletrodos de cobre tungstênio tiveram o menor valor apresentado na usinagem do AISI H13.
The manufacture of molds and dies are rich in detail and complex geometries, requiring more innovative and precise technologes. One of the processes that stands out in the manufacture of molds and dies, is to EDM by penetration (Electrical Discharge Machining - EDM). The cutting by electrical discharge is classified as a non-defined geometry manufacturing process where material removal is carried out by repeated electrical discharge between two electrodes electrically conductive. The tool wear is a major measurement parameters in machining performance by EDM. The biggest problem caused by the electrode corner wear is the tool geometry change during the machining by changing the geometric tolerance and dimensional cavity. This paper proposes dimensional evaluation of the electrode corner wear, during the machining of the EDM process, varying the front surface of the electrode angle. Another purpose is to create an index, called rounding rate, which takes into account the areas of electrode corner wear due to the removed area of the workpiece material. The results showed that the copper electrode, copper tungsten and graphite, has a large corner radius growth at the beginning of machining, stabilizing these values with higher process time. The front surface of the electrode angle influence directly on the electrode corner wear. Graphite electrodes showed no corner wear rounding behavior during the tests. For rounding rate index tungsten copper electrodes had the lowest value presented in the machining of AISI H13.
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Vale, João Luiz do. "Influência da microestrutura de ferros fundidos na ocorrência de metal dobrado e no comportamento tribológico de superfícies brunidas." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2740.

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O presente trabalho discute a influência da microestrutura dos ferros fundidos, cinzento (FFC) e vermicular (FFV), na ocorrência de metal dobrado (FM) em superfícies brunidas e no comportamento tribológico em ensaio lubrificado do tipo anel sobre cilindro. As amostras de ferro fundido foram extraídas diretamente de um bloco de motor de combustão interna, em regiões de diferentes espessuras. O anel de pistão utilizado foi de aço inoxidável martensítico nitretado com perfil assimétrico e o óleo lubrificante foi o SAE 30 CF monoviscoso. A quantificação de sulcos e de metal dobrado (FM) foi realizada empregando-se uma metodologia baseada na literatura. Para a execução dos ensaios tribológicos foi projetada e construída uma adaptação para a montagem das amostras e controle de temperatura do óleo lubrificante. Um parâmetro para avaliação do desempenho tribológico foi proposto – índice de mérito tribológico (IMT) – que leva em conta coeficiente de atrito (COF) e alterações de topografia. Os ferros fundidos apresentaram microestruturas típicas. Contudo, observaram-se diferenças de morfologia e distribuição da grafita; com maior número de grafitas e menor fração de grafita para os materiais de parede fina. Observou-se FM nos platôs e nos sulcos das superfícies brunidas em todas as amostras. Quantificações mostraram que as larguras dos sulcos foram estatisticamente iguais e com alto percentual de obstrução. A quantificação de FM dos materiais mostrou maiores valores presentes na região do Spk (FMspk) para os FFC's. Os materiais de parede grossa apresentaram maiores valores de % FM dentro do sulco (%FM/Sulco) e este parâmetro teve forte e positiva correlação estatística com a fração de grafita. Evidências, obtidas em avaliações de seções transversais, corroboraram a relação entre FM e grafita. Constatou-se que o FM pode ser formado diretamente sobre a grafita ou, ainda, de forma indireta devido à extrusão desta fase. Ademais, verificou-se que a morfologia e orientação da grafita têm influência na formação do FM. Realizaram-se ensaios preliminares de curta duração de anel sobre cilindro para a avaliação da repetibilidade dos resultados de COF, os quais indicaram menor dispersão para condições com menores frequências e maiores forças normais. Avaliações da dinâmica do ensaio tribológico permitiram apontar relações de redução de COF durante os semi-ciclos de movimento e associá-las à teoria de lubrificação hidrodinâmica. O COF para ensaios de longa duração apresentou comportamento cíclico com transições. Estas transições foram associadas a mecanismos de formação-remoção-formação de tribofilmes de ZDDP. Os ensaios impuseram alterações nos parâmetros de rugosidade (principalmente com alisamento das superfícies) e redução do parâmetro de filme. O IMT evidenciou pouca influência da espessura do material; e melhor desempenho tribológico para os FFV's. A rotina de quantificação de FM mostrou limitação técnica devido ao alisamento da superfície, o que causa mudança na referência de alturas das superfícies brunidas. Ainda assim, verificou-se redução do %FM/Sulco e tendência de desobstrução do sulco. Contatou-se pouca influência do FM no comportamento do COF devido à similaridade dos parâmetros de FM entre os materiais. Contudo, o FM foi associado a um agente de abrasão à três corpos e apresentou forte correlação positiva do parâmetro de FMspk (no início do ensaio) com o parâmetro do IMT relacionado com a alteração de topografia.
The present work discusses the influence of the microstructure of gray cast iron (GCI) and compacted graphite iron (CGI) on the occurrence of folded metal (FM) on honed surfaces and its tribological behavior in ring-on-cylinder test under lubrication. The cast iron samples were taken directly from an internal combustion engine block in regions of different thicknesses. The piston ring used was a nitrided martensitic stainless steel with asymmetrical profile and the lubricant oil was the SAE 30 CF. The quantification of grooves and folded metal (FM) was carried out using a methodology based on the literature. For the execution of the tribological tests an adaptation was designed and built for assembling the samples and for controlling the oil temperature. One parameter to evaluate the tribological performance was proposed - tribological merit index (TMI) - which considers the coefficient of friction (COF) and changes in topography. Each cast iron presented typical microstructures. However, differences in morphology and graphite distribution were observed; the samples from thinner wall presented higher number of graphite and less fraction of graphite. FM was observed on the plateaus and grooves of the honed surfaces in all samples. Quantification showed that the widths of the grooves were statistically similar and with a high percentage of obstruction. GCIs present a higher amount of FM in the Spk region (FMspk).The thicker wall samples presented a higher amount of FM in the grooves (% FM / Groove) and this parameter had a strong and positive statistical correlation with the graphite fraction. Evidences, obtained in cross section evaluations, corroborated the relationship between FM and graphite. It was verified that FM can be formed directly on graphite or indirectly due to the extrusion of this phase. In addition, its morphology and orientation influenced the occurrence of FM. Preliminary short-term tests were performed to evaluate the repeatability of COF results. These tests indicated less dispersion for conditions with lower frequencies and higher normal forces. Evaluations of the dynamics of the tribological test allowed to point out conditions to reduce the COF during the half-cycles of movement and to associate them to the theory of hydrodynamic lubrication. The COF for long-term tests presented cyclical behavior with transitions. These transitions were associated with formation-removal-formation mechanisms of ZDDP tribofilms. The tribological tests imposed changes on the roughness parameters (mainly with smoothness of the surfaces) and reductions on the film parameter. The thickness of samples affected little the TMI; and a better tribological performance of CGIs was detected. The FM quantification routine showed a technical limitation due to surface smoothing, which causes a change in the reference of heights of honed surfaces. Nevertheless, there was a reduction in %FM/Groove and tendency to clear the grooves. There was little influence of FM in COF behavior due to the similarity of FM parameters among the materials. However, FM was associated as a three-body abrasive agent and a strong positive correlation between the FMspk parameter (at the beginning of the test) and the TMI parameter was described.
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Abebe, Abay Damte, and Qikang He. "Foam Behavior Analysis Based On A Force Measurement System." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-37250.

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Abstract In the world where every sector of industrial manufacturing is being converted toautomated systems, surface finishing processes like sanding and polishing seem to lag.This phenomenon is not surprising as these processes are complex to optimize. Therehave been projects going on with the support of European Commission to findsolutions under SYMPLEXITY (Symbiotic Human-Robot Solutions for ComplexSurface Finishing Operations). One of the projects in under this include poliMATIC(Automated Polishing for the European Tooling Industry). Halmstad University isinvolved in doing projects. This project took a portion of this study in aim to understand a foam material’s behavior used for sanding tool at the tip of a robotic arm. This is studied using a forcemeasurement system developed at Halmstad University. The project has two sectionsand starts with one; Understanding the force measurement system and upgrading innecessary ways. Two; studying how the foam material compressive hardness propertyis affected when the material is fit with sandpaper for sanding operation using theforce measurement system. The study finally revealed how the combination of thefoam with sandpaper affects the robustness of the material, and significantlyimproved the output of the system with by reducing the noise level with 40%.
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Books on the topic "Surfaces (Technology) Mechanical wear"

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Surface wear: Analysis, treatment, and prevention. Materials Park, Ohio: ASM International, 2001.

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Belyĭ, A. V. Struktura i metody formirovanii͡a︡ iznosostoĭkikh poverkhnostnykh sloev. Moskva: "Mashinostroenie", 1991.

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Czarnecki, Henryk. Udział warstwy wierzchniej w kształtowaniu odporności na zużycie tribologiczne. Częstochowa: Wydawn. Politechniki Częstochowskiej, 2008.

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Materials and surface engineering in tribology. Hoboken, NJ: John Wiley & Sons, 2008.

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Lam, Loh Nee, and Chandrasekaran Margam, eds. Materials degradation and its control by surface engineering. 2nd ed. London: Imperial College Press, 2002.

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Lam, Loh Nee, and Chandrasekaran Margam, eds. Materials degradation and its control by surface engineering. River Edge, NJ: Imperial College Press, 1999.

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Vlasov, V. M. Rabotosposobnostʹ uprochnennykh trushchikhsi͡a︡ poverkhnosteĭ. Moskva: "Mashinostroenie", 1987.

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Miyoshi, Kazuhisa. Studies of mechano-chemical interactions in the tribological behavior of materials. [Washington, D.C.]: NASA, 1990.

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Miyoshi, Kazuhisa. Studies of mechano-chemical interactions in the tribological behavior of materials. [Washington, D.C.]: NASA, 1990.

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Miyoshi, Kazuhisa. Studies of mechano-chemical interactions in the tribological behavior of materials. [Washington, D.C.]: NASA, 1990.

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Book chapters on the topic "Surfaces (Technology) Mechanical wear"

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Martsynkovskyy, Vasyl, Viacheslav Tarelnyk, Ievgen Konoplianchenko, Oksana Gaponova, and Mykhailo Dumanchuk. "Technology Support for Protecting Contacting Surfaces of Half-Coupling—Shaft Press Joints Against Fretting Wear." In Lecture Notes in Mechanical Engineering, 216–25. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22365-6_22.

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Rostagno, Maddalena, and Federico Cartasegna. "Anti-Wear Coatings for Food Processing." In Plasma Technology for Hyperfunctional Surfaces, 263–94. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630455.ch9.

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de la Mare, R. F. "Overhaul Cost Escalation Due to Mechanical Wear-Out." In 10th Advances in Reliability Technology Symposium, 335–44. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1355-4_31.

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Pinner, Tobias, Hermann Sommer Obando, Georg Moeser, and Wolfgang Burger. "Monitoring Lathe Tool’s Wear Condition by Acoustic Emission Technology." In Lecture Notes in Mechanical Engineering, 183–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39348-8_15.

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Svirzhevskyi, Kostiantyn, Oleg Zabolotnyi, Anatolii Tkachuk, Valentyn Zablotskyi, and Dagmar Cagáňová. "Methods of Evaluating the Wear Resistance of the Contact Surfaces of Rolling Bearings." In Lecture Notes in Mechanical Engineering, 453–63. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68014-5_45.

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Zablotskyi, Valentyn, Anatolii Tkachuk, Serhii Moroz, Stanislav Prystupa, and Kostiantyn Svirzhevskyi. "Influence of Technological Methods of Processing on Wear Resistance of Conjugated Cylindrical Surfaces." In Lecture Notes in Mechanical Engineering, 477–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68014-5_47.

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Svirzhevskyi, Kostiantyn, Oleg Zabolotnyi, Anatolii Tkachuk, José Machado, and Andriy Kononenko. "An Increase in Wear Resistance Frictional Contact of Functional Surfaces for Plunger Pairs." In Lecture Notes in Mechanical Engineering, 84–94. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77823-1_9.

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Luhovska, Katerina, Andrey Movchanuk, Volodymyr Feshich, and Alina Shulha. "Technology of Ultrasonic Cavitation Cleaning of Elastic Surfaces." In Lecture Notes in Mechanical Engineering, 264–71. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59509-8_23.

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Sychuk, Viktor, Oleg Zabolotnyi, and Dmytro Somov. "Technology of Effective Abrasive Jet Machining of Parts Surfaces." In Lecture Notes in Mechanical Engineering, 166–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93587-4_18.

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Kunitsyn, Maksym, and Anatoly Usov. "Improvement of a Stochastic Dynamic Model for Grinding of Cylindrical Surfaces with Wear-Resistant Coatings." In Lecture Notes in Mechanical Engineering, 534–44. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68014-5_52.

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Conference papers on the topic "Surfaces (Technology) Mechanical wear"

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Henerichs, M., C. Dold, R. Voß, and K. Wegener. "Performance of Lasered PCD- and CVD-Diamond Cutting Inserts for Machining Carbon Fiber Reinforced Plastics (CFRP)." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62675.

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Carbon fiber reinforced plastics (CFRP) combine superior mechanical properties with a low weight. Consequently, this material is highly interesting for the aircraft as well as the automotive industry, leading to a massively increased application over the last years. However machining CFRP still faces different difficulties: The material is highly abrasive, most tool substrates and coatings face massive abrasive wear. Machining CFRP often results in many material defects like delamination, fiber pull-out, high surface roughness and burnt matrix material. Several technologies have been developed to combine ultra-hard tool surfaces and most adaptable cutting edge geometries. One of the most interesting approaches is laser machining of diamond cutting edges. The technology combines the wear resistance of thick layer diamonds with a geometrical flexibility so far known only for carbide tools. In the presented study, the wear resistance of different Polycrystalline Diamond (PCD) and Chemical Vapor Deposition (CVD)-Diamond grades machined with two different laser systems has been tested for machining CFRP. In comparison state-of-the-art grinded PCD cutting inserts are being tested. The comparison of machining characteristics is done by machining CFRP in a continuous turning process with a single fiber orientation. Machining forces are measured to evaluate tool wear. The resulting work piece quality is analyzed by measuring the surface roughness. The machined CFRP is a M21 resin system with an IMA-12K fiber from Hexcel©. Laser machined cutting inserts show equal or superior wear resistance compared to the grinded cutting inserts. In result today lasered cutting inserts are the machining tools available with the highest tool life time. In combination with the freely adaptable tool geometry, lasered cutting inserts are the superior tool system for upcoming machining tasks.
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Bardetsky, Alexander, Helmi Attia, and Mohamed Elbestawi. "Evaluation of Tool Wear Suppressive Ability of Lubricants Usein in Minimum Quantity Lubrication Application in High Speed Machining of Cast Aluminum Alloys." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80597.

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The disadvantages of conventional metalworking fluids such as disposal problems, health problems and economic factors have led to the development of strategies to reduce their amount in metalworking. Recently, Minimum Quantity Lubrication (MQL) technology was developed and it seems to be a suitable alternative for economically and environmentally compatible production. It combines the functionality of lubrication with an extremely low consumption of lubricant and has a potential to replace metalworking fluids application in machining operations. The MQL lubricants are formulated with two major groups of additives; anti-wear (AW) additives and extreme pressure (EP) additives. When such lubricants are applied to the cutting zone, protective layers are formed on the interacting surfaces of the workpiece and the cutting tool. These layers prevent direct contact between the tool and chip surfaces, and, therefore reduce friction forces and tool wear. In order to utilize MQL to its full potential, it is essential to select appropriate lubricant composition for particular work material and machining parameters. The experimental study of different compositions of MQL lubricants is reported. The effectiveness of the lubricants are determined in terms of their ability to protect the cutting tool in high speed machining of cast aluminum alloys, which are widely used in automotive industry. The main objective of this research is to quantitatively evaluate the ability of lubricant’s additive composition to reduce the tool wear. This is reached through the comparison between the tool wear rate measured during the machining of aluminum cast alloy with the application of MQL, and the tool wear rate obtained in dry machining of the same alloy. Two kinds of the lubricants are evaluated; vegetable and synthetic. The content of AW and EP additives in each kind of lubricant was varied on three levels in order to capture the effect of the lubricant’s composition on tool wear. The result of the MQL lubricants evaluation is discussed and the recommendations for optimal lubricant composition are made.
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da Silva, Hebert Roberto, Valtair Antonio Ferraresi, and Rosenda Valdes Arencibia. "Operational Aspects of Coatings Welds: Erosive Wear and Cavitation." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70169.

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The GMAW process using two wires is an alternative to a coating process when high productivity is desired. The potential variants emerging from this process are GMAW cold wire and GMAW double wire. One of the greatest difficulties is the setting of its parameters, which duplication compared to conventional GMAW and also act in a dependent manner. A greater understanding of the technology applied to coatings on turbines in various positions is critical to master the process and its variables for enhancing industrial applications. This study involves an experimental evaluation to verify the influence of some variables on the profile of cord and wear resistance. This paper proposes making deposits with weld metal AWS 308LSi stainless steel and alloys of cobalt (Stellite 6 and 21) plates in carbon steel SAE 1020 in the flat positions. The wear characterization in the lining is used to determine the hardness and surface topography. It is concluded that cobalt alloys have superior resistance to erosive damage, with emphasis on Stellite 21 with respect to erosion and Stellite 6 with respect to cavitation. Mixtures of austenitic stainless steel and cobalt alloys have intermediate wear values. Therefore, it is essential to study welding processes with multiple wires, as proposed in this paper, to determine the optimal combination of alloys for resistance to cavitation-erosion phenomena.
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Ribaudo, Carl R., Chris Aylott, Dieter Hofmann, Craig V. Darragh, Ryan D. Evans, Elizabeth P. Cooke, and Gary L. Doll. "Engineered Surfaces for Improved Gear Scuffing Resistance." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48113.

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Scuffing is a severe form of adhesive wear that can occur on gear flanks operating at combinations of high sliding speed and contact stress in marginal lubrication. Engineered Surfaces (ES) refers to the selection, application, and use of certain topographical modification (TM) techniques and thin film coatings applied using advanced physical vapor deposition (PVD) to improve the tribological performance of mechanical components. In this study, the effects of ES technology upon the scuffing resistance of helical gears were empirically determined. Six different treatments of ES technology were tested along with a baseline treatment of uncoated ground surfaces. In the testing, the gear speed was kept constant while the input torque on the gears was incrementally increased until scuffing was observed. Three ES treatments produced statistically significant increases in the scuffing torque relative to the baseline. Increases in mean scuffing torque using ES technology were as high as 89%.
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Karpuschewski, B., and F. Welzel. "Tribological Conditioning of Cylinder Running Surfaces." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7237.

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In the wake of increasing performance requirements for internal combustion engines, regarding downsizing, and rising mobility, efficient manufacturing processes are gaining significance in Far Eastern markets. Also in consideration of increasing emission limits for these combustion engines, investigations regarding alternative technologies for the efficient manufacturing of performance-optimized cylinder running surfaces were carried out by the Institute of Manufacturing Technology and Quality Management. The microstructure of these surfaces and the subsequent surface integrity are in the focus of considerations. Using tribological analysis of the mechanical running-in behavior of cylinder running surfaces, conclusions will be drawn on the impact of the last honing step of the engine production. These investigations are carried out in terms of a possible conditioning of tribotechnical systems in their production and the concomitant reduction of friction and wear-intensive running-in processes. In this regard alternative finishing operations like burnishing are investigated.
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Peterson, K. A., P. Tangyunyong, and D. L. Barton. "Failure Analysis for Micro-Electrical-Mechanical Systems (MEMS)." In ISTFA 1997. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.istfa1997p0133.

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Abstract Micro-Electrical Mechanical Systems (MEMS) is an emerging technology with demonstrated potential for a wide range of applications including sensors and actuators for medical, industrial, consumer, military, automotive and instrumentation products. Failure analysis (FA) of MEMS is critically needed for the successful design, fabrication, performance analysis and reliability assurance of this new technology. Many devices have been examined using techniques developed for integrated circuit analysis, including optical inspection, scanning laser microscopy (SLM), scanning electron microscopy (SEM), focused ion beam (FIB) techniques, atomic force microscopy (AFM), infrared (lR) microscopy, light emission (LE) microscopy, acoustic microscopy and acoustic emission analysis. For example, the FIB was used to microsection microengines that developed poor performance characteristics. Subsequent SEM analysis clearly demonstrated the absence of wear on gear, hub, and pin joint bearing surfaces, contrary to expectations. Another example involved the use of infrared microscopy for thermal analysis of operating microengines. Hot spots were located, which did not involve the gear or hub, but indicated contact between comb structures which drive microengines. Voltage contrast imaging proved useful on static and operating MEMS in both the SEM and the FIB and identified electrostatic clamping as a potentially significant contributor to failure mechanisms in microengines. This work describes MEMS devices, FA techniques, failure modes, and examples of FA of MEMS.
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Salimi Jazi, M., S. Abuali Galedari, F. Azarmi, X. Tangpong, Y. Huang, and Z. Lin. "Evaluation of Mechanical Properties of Plasma Sprayed Mixture of Partially Stabilized Zirconia and Tungsten Carbide on Low Carbon Steel." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51766.

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Industries such as aerospace, automotive, oil and gas utilize various chemical, thermal, and mechanical techniques to improve the surface properties of engineering components. Deposition of metallic or nonmetallic materials on the surface of engineering components using different thermal spraying techniques is a common method to improve the mechanical properties of the surface of the components working at severe conditions. Thermal spraying techniques are capable of deposition of a coating layer with high corrosion, wear, erosion, and high temperature resistance. This technology can also be used for surface repair and treatment. Zirconia (ZrO2) based coatings are excellent candidates to serve at high temperature due to their tribological and insulation properties, and also high stiffness. ZrO2-based coatings are usually used in aircraft and gas-turbine engines as thermal barrier coatings. However, the relatively low wear and erosion resistance of Zirconia-based coatings limits their application. Among all coating materials, Tungsten Carbide (WC) based materials are commonly used to improve wear and corrosion resistance of the surface. It is speculated that combination of ZrO2 and WC follows by generating a coating with desirable thermal and mechanical properties, particularly at high temperature conditions. In the presented work, an innovative thermally sprayed coating material was proposed by depositing mixture of ZrO2-Y2O3 and WC-Ni (YPSZ/WC-Ni) powders on a low carbon steel substrate using Atmospheric Plasma Spraying (APS). As thermomechanical properties of coatings are under the influence of the microstructural features such as porosity, micro cracks, voids, and possible oxides, in this study microstructure and phase consistency of the resultant coating was briefly evaluated. To this end, Optical Microscopy, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) were used. The results indicated that deposited coating was well-bonded to the substrate with minimum observed separation line. Porosity amount of APS deposited YPSZ/WC-Ni measured by image analysis of the cross-sectional area Moreover, mechanical properties including hardness and elastic modulus of the coating were evaluated. Since thermally sprayed coatings exhibit anisotropic behavior, the Knoop hardness in the longitudinal and transverse directions were analyzed in this study. Elastic modulus of the coating was also evaluated, based on the measurement of elastic recovery of Knoop indentation in both directions using Marshal analytical model. Wear resistance of the coating was also investigated by pin-on-disk method, at room temperature. The friction coefficient of the consecutive coating was calculated and had a value lower than that of reported for APS deposited YPSZ.
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Wang, Yachao, Jing Shi, and Xinnan Wang. "Influences of Silicon Crystal Anisotropy in Nano-Machining Processes Using AFM." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65674.

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Atomic force microscope (AFM) machining has the potential to become an essential technology for manufacturing micro/nano-scale devices. In literature, this technique has been successfully employed to machine various types of materials, including semiconductor materials and metals. However, the effect of material anisotropy in terms of crystal direction is rarely considered in the existing studies. In this paper, we conduct nano-scratching experiments on the (1 0 0) plane of single crystal silicon surface with a diamond tip in an AFM machine. Three levels of crystal direction of nano-scratching are considered. Four levels of normal loading are applied. Machining performances are mainly evaluated by the groove morphology. Also, the wear coefficients and scratch ratio are calculated to the anti-wear performance. Based on the pile up volume and cutting volume respectively, the presence of the ploughing and cutting mechanisms is determined. The experiment results indicate that the applied normal load significantly affect the groove depth and debris morphology. The scratching direction has a pronounced effect on the friction coefficient and the calculated scratching hardness. By observing the debris morphology and cracks formation, the dependence of ductile to brittle transformation mechanism of silicon machining on the crystal direction is also discussed.
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Untaroiu, Alexandrina, Houston G. Wood, Paul E. Allaire, and Timothy W. Dimond. "Calculation of Dynamic Coefficients for a Magnetically Levitated Artificial Heart Pump Using a CFD Approach." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67802.

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The artificial heart community acknowledges the 3rd generation Ventricular Assist Devices (VADs) as the leading technology in mechanical blood pump development. This category consists of rotary pumps with no mechanical or fluid bearings in contact with the fluid medium, usually magnetic or noncontacting hydrodynamic bearings. A magnetic suspension prevents the rotating impeller from contacting the pump’s internal surfaces and reduces regions of stagnant and high shear flow that normally surround a fluid or mechanical bearing. Magnetic bearings have no moving parts in contact and thus do not wear over time; this generally lengthens the operational life of the pumps as compared to those supported by conventional bearings. Employing this 3rd generation technology, the University of Virginia has been developing a ventricular assist device (LifeFlow) with a rotor that is suspended entirely by magnetic bearings. In order to perform the stability analysis, the hydrodynamic effects of the rotating impeller should be included in the calculation. This study describes the method to calculate the stiffness, damping, and mass coefficients, based on the CFD prediction of radial fluid forces exerted on the impeller due to its eccentric position inside the pump housing over a range of operating conditions. In consideration of the suspension design, the fluid forces exerted on the levitated axial impeller were estimated using CFD such that any fluid perturbations would be accounted for and counterbalanced during the suspension and motor design phase.
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Zaha´lka, Frantisˇek, Sˇa´rka Houdkova´, and Michaela Kasˇparova´. "The Damage of a Plunger Operating in Carbamide Environment." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77303.

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The surface of plungers, operating in demanding conditions, is exposed to the effects of pumped media, which may be chemically aggressive, in combination with mechanical wear caused by the interaction between the plunger, the counterpart and possibly the solid particles included in the pumped media. To increase of plunger’s lifetime, their surfaces can be protected by different technologies of a surface treatment. One of them is the progressive technology of thermal spraying. A wide range of sprayed materials is one of the reasons for using these versatile coatings as the protection against corrosion, wear or high temperature exposition in order to increase the parts lifetime, reliability and safety. In this case, the TAFA Praxair JP-5000 spraying equipment was used for the creation of the WC-based hardmetal coating on the plungers operating in carbamide environment. Even though the spraying process and the check sample were without any sign of defects the plungers showed a critical damage after several hours of running. The damage mechanism, its possible causes and the proposed solution are discussed in this paper.
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Reports on the topic "Surfaces (Technology) Mechanical wear"

1

Fan, Qi, and Nina Baule. Boride-Carbon Hybrid Technology to Produce Ultra-Wear and Corrosion Resistant Surfaces for Applications in Harsh Conditions (Final Technical Report). Office of Scientific and Technical Information (OSTI), December 2020. http://dx.doi.org/10.2172/1769175.

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2

Whisler, Daniel, Rafael Gomez Consarnau, and Ryan Coy. Novel Eco-Friendly, Recycled Composites for Improved CA Road Surfaces. Mineta Transportation Institute, July 2021. http://dx.doi.org/10.31979/mti.2021.2046.

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Abstract:
The continued use of structural plastics in consumer products, industry, and transportation represents a potential source for durable, long lasting, and recyclable roadways. Costs to dispose of reinforced plastics can be similar to procuring new asphalt with mechanical performance exceeding that of the traditional road surface. This project examines improved material development times by leveraging advanced computational material models based on validated experimental data. By testing traditional asphalt and select carbon and glass reinforced composites, both new and recycled, it is possible to develop a finite element simulation that can predict the material characteristics under a number of loads virtually, and with less lead time compared to experimental testing. From the tested specimens, composites show minimal strength degradation when recycled and used within the asphalt design envelopes considered, with an average of 49% less wear, two orders of magnitude higher compressive strength, and three orders for tensile strength. Predictive computational analysis using the validated material models developed for this investigation confirms the long-term durability.
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