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Статті в журналах з теми "Abrasing wear"
1
Sokur, Mykola, Volodymyr Biletskyi, Mykhailo Fyk, Oleksandr Fyk, and Igor Zaselskiy. "The study of the lining layer abrasing wear in the semi-autogenous grinding mill." E3S Web of Conferences 166 (2020): 03008. http://dx.doi.org/10.1051/e3sconf/202016603008.
Повний текст джерелаАнотація:
In this work complex investigations of the abrasing wear of lining of self-grinding mills (semiautogenous grinding mills) are carried out with the obtaining of mathematical models of wear-abrasing of elevators in terms of height, weight, volume and worn-out area. In particular, according to the location and nature of the abrasing wear processes, the liner-lifters mill self-grinding are identified in three typical groups. During 1 year, in the conditions of Ingulets GOK, the monitoring of the abrasing wear of selected groups of lifters of self-grinding mills was performed. On the basis of the experimental data calculationed in the Microsoft Office Excel program, a set of mathematical models of lifter abrasing wear was obtained in terms of height, weight, volume and worn-out area. The obtained dependencies are recommended for prediction of abrasing wear of lining and necessary frequency of replacement of inserts-lifters. In addition, the research of wear of lining made of cast iron RF–4, showed a significant reduction in their abrasing wear compared with steel 110G13L. Thus, it has been shown that the selection of liner-lifters materials can reduce the inter–repair period by 3 times or more (replacement of worn-out lifters). A comparison of the actual picture of the abrasing wear of elevators and Simulation Statics simulated result (using SolidWorks) stresses shows the convergence of the arrangement of the zones of maximum stresses and the maximum abrasing wear of the lining. Investigation of the influence of the stressed state of lining plates on the intensity of their abrasing wear – a promising direction for further research.
2
Kouketsu, Fernanda, Daniel Pacholok, Tiago Cousseau, and Carlos Henrique da Silva. "Abrasive wear resistance of idler roll polymeric materials." Surface Topography: Metrology and Properties 10, no. 3 (2022): 034002. http://dx.doi.org/10.1088/2051-672x/ac89a2.
Повний текст джерелаАнотація:
Abstract Idler rolls are an integral part of belt conveyors. Recently, steel idler rolls have been replaced with polymeric ones in low to middle load applications, bringing several advantages due to the polymer’s lightweight and low abrasiveness in the conveyor belt. However, using polymeric material for high load application brings challenges, particularly presenting similar structural and abrasion resistance to steel. This work puts forwards a methodology using a rubber-wheel tribometer to evaluate the abrasion resistance of polymeric idler rolls in their most severe operating condition (halted idler roll) and defines a threshold limit based on the results obtained with steel idler rolls. The methodology was applied to 07 different polymeric materials. To further understand materials abrasions resistance, scratching tests were performed, and the main wear mechanisms, verified by scanning electron microscopy (SEM) and abrasion factor (FAB), were discussed along with the material properties. The main conclusions are: i) some polymeric materials present abrasion resistance similar to steel rolls; ii) the wear micromechanisms, verified by SEM and FAB, are good indicators of abrasion resistance of the materials but insufficient because they do not include temperature and fatigue effects resulting from multi abrasive events; iii) the additive fillers significantly altered the abrasive resistance of materials, although they do not change the material properties significantly.
3
Jankauskas, Vytenis, Audrius Žunda, Artūras Katinas, and Simona Tučkutė. "Wear Study of Bulk Cargo Vehicle Body Materials Used to Transport Dolomite." Coatings 15, no. 2 (2025): 227. https://doi.org/10.3390/coatings15020227.
Повний текст джерелаАнотація:
Steel and aluminum alloys are used to manufacture the bodies of bulk material handling machines. The aluminum body enables a higher load mass and thus reduces transport costs. However, the greater abrasion of aluminum alloys leads to more frequent repairs to the underside of the body, as the abrasion parameters of aluminum are lower. This study, which used three different methods to evaluate abrasive wear (erosive/impact wear, abrasive wear in the mass of the free abrasive and abrasion test according to ASTM G65), showed that the most significant influence on the wear of 3004 series aluminum is the grain size of the abrasive. Only under erosive/impact wear conditions with abrasive particles of 2.0–5.0 and 5.0–8.0 mm is aluminum competitive with Hardox 450 in terms of volumetric wear, with aluminum exhibiting 1.3–1.4 times the wear rate of steel. Tests on the abrasive mass of the grinding fraction in question have shown that the volumetric wear of aluminum is 0.2–2.3 times higher at very low contact loads. In contrast, aluminum wears 7.5 and 4 times more than steel in the ASTM G65 test (0.1–0.4 mm fraction) at low and medium contact loads. Only in exceptional cases is the aluminum floor of bulk material handling equipment competitive with hardened steel in terms of wear intensity.
4
Chotěborský, R., P. Hrabě, M. Müller, J. Savková, M. Jirka, and M. Navrátilová. "Effect of abrasive particle size on abrasive wear of hardfacing alloys." Research in Agricultural Engineering 55, No. 3 (2009): 101–13. http://dx.doi.org/10.17221/24/2008-rae.
Повний текст джерелаАнотація:
Hardfacing is one of the most useful and economical ways to improve the performance of components submitted to severe wear conditions. This study has been made for the comparison of microstructure and abrasion resistance of hardfacing alloys reinforced with chromium carbides or complex carbides. The hardfacing alloys were deposited onto ČNS EN S235JR low carbon steel plates by the gas metal arc welding (GMAW) method. Different commercial hardfacing electrodes were applied to investigate the effect of abrasive particle size on abrasive wear resistance. The abrasion tests were made using the two-body abrasion test according to ČSN 01 5084 standard, abrasive cloths were of grits 80, 120, 240, and 400. Microstructure characterisation and surface analysis were made using optical and scanning electron microscopy. The results show the different influence of abrasive particles size on the wear rate for different structures of Fe-Cr-C system. The structures without primary carbides are of high abrasive wear rate, which increases nonlinearly with the increasing abrasive particle size. On the contrary, the structures containing primary carbides are of low abrasive rates and theses rates increase linearly with the increasing abrasive particle size.
5
Pinto, Gustavo Filipe, Andresa Baptista, Vitor F. C. Sousa, Francisco J. G. Silva, Manuel Evaristo, and Filipe Fernandes. "Study on the Wear Modes of PVD Films Using Different Concentrations of Al2O3 Abrasive Particles and Textured Rotating Balls." Coatings 13, no. 3 (2023): 628. http://dx.doi.org/10.3390/coatings13030628.
Повний текст джерелаАнотація:
Abrasive wear is a wear mechanism that results in a loss of material from the interaction of a surface with hard particles. This type of wear is frequently found in the surface of machining tools. Microscale abrasion equipment is often used to characterize the resistance to abrasive wear of a surface. The different parameters able to control micro-abrasion wear tests, such as ball rotation, sliding distance between ball and surface sample, abrasive slurry concentration, normal load acting on the sample, and abrasive flow rate over the sample, have been widely studied. The combination of different variables, including sliding distance, concentration of abrasive particles, their hardness, and size of abrasive particles, promotes the transition between two-body, three-body, or mixed abrasive wear modes. However, the influence of the ball surface on the dragging of abrasive particles, which is reflected in the wear modes, is still poorly studied. One of the variables possible to control and less studied is the influence of the ball surface texture on the dragging of abrasive particles in micro-abrasion wear tests. This work intends to correlate the effect of different testing times (500, 1000, and 1500 cycles) and different concentrations of 3 μm Al2O3 abrasive slurry (25, 35, and 45 g/100 mL) on the micro abrasion resistance of a TiN thin coating film, using balls of AISI 52100 steel whose texture and roughness were prepared by 60 s chemical etching. The rotation speed of each test was 80 rpm, applying a normal load of 2 N. Subsequently, the craters were carefully analyzed using SEM to evaluate the transition of the wear mode as a function of the applied load, the abrasive particle concentration, and the sliding distance. The textured ball tracks were observed via SEM to assess the particle dynamics. The results showed that, contrarily to what is reported in the literature regarding wear modes where rolling is promoted with increasing abrasive concentration, in this work grooving took place instead. This is a result of the rough balls use in the experiments which, due to the embedment of abrasive particles in the ball grooves, promotes the abrasion mechanism. The higher the abrasive concentration, the higher the grooving mechanism, since more particles are available to scratch the surface.
6
Zhang, S. W. "Studies on rubber wear." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 212, no. 3 (1998): 227–34. http://dx.doi.org/10.1243/1350650981542047.
Повний текст джерелаАнотація:
Achievements in research on rubber wear by the present author and his group over the past ten years are summarized briefly. These results include mechanisms and wear equations for dry and wet abrasion, basic features and wear mechanism of oily abrasion, theory of dry abrasion by a line contact, physical processes and surface mechanochemical effects of abrasive erosion. They are not only significant in the context of rubber tribology but are also valuable for extending the working life of rubber components.
7
Zhang, Jinbo, Qingzhu Zhang, yiyuan Ge, and yongcheng jiang. "Analysis of the Wear-Resistance Characteristics of Bionic Ridge Structures." Applied Engineering in Agriculture 36, no. 5 (2020): 697–702. http://dx.doi.org/10.13031/aea.13680.
Повний текст джерелаАнотація:
HighlightsBionic technology can be applied to resolve agricultural engineering problems.Pangolin Squama and Chlamys Farreri shells possess excellent wear-resistance.Bionic ridges can improve sample wear-resistance.Abstract. Consistent soil contact rapidly wears the soil-engaging components of agricultural machinery, such as ploughs and subsoilers. A bionic method was applied to their structural design to improve component wear resistance. Some animal organs possess excellent wear-resistant structures which can provide design inspiration for improving the wear-resistance of agricultural mechanical parts. Previous research found that many ridges exist on Pangolin squama and Chlamys Farreri shell surfaces. Those ridges cause Pangolin squama and Chlamys Farreri shells to exhibit excellent wear-resistance. Therefore, these ridge structures were applied to the design of experimental subsoiler samples (bionic samples) to enhance their wear-resistance. An abrasive wear tester was utilized to conduct abrasive wear experiments under special experimental conditions. These experimental conditions involved sliding speed, soil particle size, moisture content, and space between the ridges. Finally, nine experiments were conducted that subjected the bionic and flat surface samples to different experimental conditions, and their respective mass-loss quantities were measured. Results show that bionic sample mass loss was less than that of the flat surface samples under the same experimental conditions; bionic sample wear-resistance improved by 77%, 73.8%, 66.9%, 45.4%, 58.9%, 65.5%, 33.1%, 66.4%, and 42.6% when compared with flat surface samples under the same experimental conditions. Orthogonal test results reveal that the soil particle size most significantly affected sample wear-resistance, followed by the space between bionic ridges and the sliding speed. One reason that bionic samples exhibited excellent wear-resistance is that the soil particles underwent a “guiding effect” and a “rolling effect” over the bionic ridge surface, thereby reducing the “micro-plowing” that soil particles generated when moving over the contact surface. Mutual interference among soil particles also reduced wear. Part of the soil particles rushing over the bionic sample surface rebounded back; the rebounded soil particles collided with incoming soil particles, then the speed and kinetic energy of all of the particles decreased and sample surface abrasion declined. Moreover, “vortexes” generated by sample surface air and ridges lead to an “air cushion” effect which can lessen the number of sample surface soil particles, and bionic ridge sample abrasions can be significantly reduced. Abrasion experiment results analysis indicates that bionic ridges distributed on subsoiler sample surfaces can significantly improve wear-resistance. The bionic design method provides a new approach for increasing the wear-resistance of the soil-engaging components of agricultural machinery. Keywords: Abrasive wear, Bionic ridge, Optimal design, Wear-resistance.
8
ZDRAVECKÁ, E., J. TKÁČOVÁ, and M. ONDÁČ. "Effect of microstructure factors on abrasion resistance of high-strength steels." Research in Agricultural Engineering 60, No. 3 (2014): 115–20. http://dx.doi.org/10.17221/20/2013-rae.
Повний текст джерелаАнотація:
Current development of high strength abrasion resistant steels is mostly oriented on high hardness, martensitic concept following the hypothesis that the abrasion resistance holds a proportional tendency with hardness. The various experimental observations have suggested that the high hardness of martenzite does not guarantee a high abrasion resistance because the brittle nature of martensite can lead to decrease their abrasive wear. The aim of this work was to analyse the influence of microstructure on abrasion resistance of selected high-strength low-alloyed steels used in the industry. The abrasive wear resistance of selected steels was obtained using an ASTM-G65 three-body abrasive wear test, microstructure and wear resistance determination. It was observed that grain refinement is an effective way of enhancing the abrasion resistance. In this context, micro alloyed steels offer an attractive combination of price and performance.
9
Rathod, Avishkar, Sanjay G. Sapate, and Rajesh K. Khatirkar. "Scaling Laws of Wear by Slurry Abrasion of Mild Steel." Applied Mechanics and Materials 446-447 (November 2013): 126–30. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.126.
Повний текст джерелаАнотація:
Wear by slurry abrasion is very expansive problem that must be taken into consideration while selecting the material for the transportation of slurry through pipeline. Abrasive wear generally occurs when abrasive slurries come in contact with the industrial engineering components or slurry transporting pipes. The abrasive particles carried by slurries eventually remove the material from the encountering surfaces which results in the early failure of the component in service. In present investigation an attempt is made to study the effect of load, slurry concentration, sliding distance on the abrasive wear behaviour of mild steel. The slurry abrasion experiments were carried out using slurry abrasion test apparatus with silica sand slurry. The findings of the present investigation indicate that slurry abrasion volume increased with slurry concentration, load and sliding distance, although the magnitude of increase was different in each case. The SEM observation of worn out surfaces revealed micro ploughing and micro cutting as wear mechanisms.
10
Fan, Yu Jin, Zhe Kun Li, Teng Han, and Wei Da Wang. "Finite Element Simulation of Abrasive Wear and Study of Wear Resistance of Material." Advanced Materials Research 765-767 (September 2013): 3192–95. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.3192.
Повний текст джерелаАнотація:
This paper presented the abrasive wear process of a particle pressing into the material and sliding on the surface simulated by finite element method to reveal wear characteristics and effect factors. The contact stress and surface deformation of material were indicated and material wear resistance was studied, it was found that the stress and the deformation of subsurface not only depends on mechanical properties of material and original surface shape, but also on deformed surface profile due to sliding. In order to prove the effects of material yield stress and deformation harden property on surface deformation and abrasion resistance property, the abrasive wear of three kinds of carbon steel were taken for examples, the simulation results were presented that the larger yield stress of carbon steel, the less surface deformation and the better abrasion resistance property when a particle sliding on the surface. The simulation results also shown that the deformation harden of carbon steel could reduce surface deformation, but couldnt always improve abrasion resistance property.
Дисертації з теми "Abrasing wear"
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/.
Повний текст джерелаАнотація:
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 trabalhos envolvendo coeficiente de atrito durante ensaios de desgaste abrasivo estão disponíveis na literatura, mas somente uma pequena parcela dedicaram-se ao estudo do coeficiente de atrito desenvolvido em ensaios de desgaste micro-abrasivo conduzidos por esfera rotativa. Adicionalmente, pesquisas preliminares reportaram que os resultados são dependentes da variação de pressão, ocasionada pela condução de ensaios sob condições de força normal constante. Logo, o propósito desta Tese de Doutorado é pesquisar a relação entre coeficiente de atrito e modos de desgaste abrasivo em ensaios desgaste micro-abrasivo por esfera rotativa, em condições de força normal constante e pressão constante. Ensaios ball-cratering foram conduzidos com esferas de aço AISI 52100 e um corpo-de-prova de aço-ferramenta AISI H10. A pasta abrasiva foi preparada com partículas de carbeto de silício (SiC) preto (tamanho médio de partícula de 3 m) e água destilada. Diferentes valores de força normal constante e pressão constante foram definidos para os experimentos. As forças normal (N) e tangencial (T) foram monitoradas continuamente durante os ensaios e a relação entre T/N foi calculada para fornecer uma indicação do coeficiente de atrito atuante no sistema tribológico esfera / partículas abrasivas / corpo-de-prova. Em todos os casos, análises por Microscopia Óptica das crateras de desgaste revelaram somente a presença de desgaste abrasivo por riscamento. Entretanto, observações mais detalhadas, conduzidas por Microscopia Eletrônica de Varredura, indicaram que diferentes níveis desgaste abrasivo por rolamento atuaram ao longo dos riscos, fenômeno nomeado de micro-rolling abrasion (microrolamento). Além disso, os resultados obtidos mostraram, também, que: i) a distância de deslizamento apresenta significante influência sobre a transição entre os modos de desgaste abrasivo, ii) para os valores de força normal constante e pressão constante adotados, o coeficiente de atrito manteve-se, aproximadamente, na mesma faixa de valores e iii) o coeficiente de atrito é independente da taxa de desgaste.<br>The micro-scale abrasive wear test by rotative ball has gained large acceptance in universities and research centers, being widely used in studies on the abrasive wear of materials. Two wear modes are usually observed in this type of test: rolling abrasion results when the abrasive particles roll on the surface of the tested specimen, while grooving abrasion is observed when the abrasive particles slide; the type of wear mode has a significant effect on the overall behaviour of a tribological system. Several works on the friction coefficient during abrasive wear tests are available in the literature, but only a few were dedicated to the friction coefficient in micro-abrasive wear tests conducted with rotating ball. Additionally, recent works have identified that results may also be affected by the change in contact pressure that occurs when tests are conducted with constant applied force. Thus, the purpose of this work is to study the relationship between friction coefficient and abrasive wear modes in ball-cratering wear tests conducted at constant normal force and constant pressure. Micro-scale abrasive wear tests were conducted with a ball of AISI 52100 steel and a specimen of AISI H10 tool steel. The abrasive slurry was prepared with black silicon carbide (SiC) particles (average particle size of 3 m) and distilled water. Two constant normal force values and two constant pressure values were selected for the tests. The tangential and normal loads were monitored throughout the tests and their ratio was calculated to provide an indication of the friction coefficient. In all cases, optical microscopy analysis of the worn craters revelated only the presence of grooving abrasion. However, a more detailed analysis conducted by SEM has indicated that different degrees of rolling abrasion have also occurred along the grooves. The results have also shown that: i) the sliding distance presents an important role on the wear mode transition, ii) for the selected values of constant normal force and constant pressure, the friction coefficient presented, approximately, the same range of values and ii) the friction coefficient was independent of the wear rate.
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.
Повний текст джерелаАнотація:
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 considered such as kinematics of abrasive particles, contact stiffness of the particle layer, friction characteristics, and wear factors. The experiments to study kinematics of particle layers are performed on a new observation tester. To define the contact stiffness of abrasive particles, experiments are conducted by the uniaxial spindle compression tester. Moreover, a tribometer test rig with applied load up to 200 N and velocity up to 1000 mm/s is used to investigate the friction characteristics and the wear behaviour of three-body tribosystem.
Analyses of influential factors on the wear behaviour in dependency of predefined process parameter are carried out. Additionally, based on the results of the experimental investigations, approximation equations representing the relation of the influential factors and the process parameters are determined. A three-body wear model is build up to represent the wear behaviour by physical wear laws. Furthermore, these approximation equations and the relevant parameters obtained by experimental investigations are included in the Fleischer’s wear equation to simulate the wear process.
With the coupled model the wear process of the sample can be simulated twodimensional over the sliding distance. It is possible to predict the wear depth and the wear intensity, which can be used to estimate the wear rate. Additionally, from the results of the wear simulation the worn surface and the local contact pressure in the contact region are determined which provide a deeper insight into the wear process.
With this simulation the understanding of the wear behaviour can be improved which is important to solve wear problems.
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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.
Повний текст джерелаАнотація:
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Previous issue date: 2016-08-31<br>A presente pesquisa teve como objetivo, investigar o efeito do teor de carbono e do
tamanho do abrasivo na resistência ao desgaste e no fenômeno de encruamento
superficial de quatro aços Hadfield. Para esse estudo, foi montado, o equipamento pino
contra disco, e, como abrasivo utilizou-se lixas de ferro, com o tamanho médio entre 36
µm e 93 µm. Para o alcance do objetivo proposto foram delimitados materiais e
métodos, a saber: (a) montagem do abrasômetro pino-disco a partir de um dispositivo
desativado disponibilizado pelo LFS-USP; (b) confrontar resultados experimentais –
dois materiais (Aço 1045 e alumínio 6351) foram submetidos a ensaios realizados na
UFPE e USP para fins de estudos comparativos; (c) avaliação da influência de
parâmetros do ensaio – três abrasivos com diferentes tamanhos de partículas e diferentes
cargas foram submetidos e avaliados mediante o desgaste abrasivo; (d) avaliação do
comportamento de diferentes composições do aço Hadfield perante ensaios de
abrasividade – aços contendo quatro diferentes teores de carbono foram submetidos a
ensaios com lixas #220 e #320; (e) análise das superfícies desgastadas – após os ensaios
dos materiais, as superfícies foram realizadas análises por microscópio eletrônico de
varredura (MEV) das superfícies desgastadas. Os resultados obtidos com o equipamento
na metodologia empregada tiveram uma boa reprodutibilidade. Foram observadas
diferenças nos resultados entre os equipamentos da UFPE e da USP. Quanto a este
tópico, o desgaste abrasivo do aço Hadfield foi influenciado pelo teor de carbono
apresentando uma relação em que maiores teores demonstraram menor efeito de
desgaste, diferentes tamanhos de abrasivo ocasionam um efeito de encruamento
significativo, onde se observou o ganho de dureza em aços com menores teores de
carbono. Contudo, foi apresentada uma oscilação do efeito no abrasivo #320. As
micrografias revelaram microssulcos e microcortes provenientes do ensaio e não foram
observadas diferenças nas marcas de desgaste quando utilizados tamanhos diferentes de
partícula abrasiva. Ao final, chegou-se a conclusão de que os resultados obtidos
demonstram que o teor de carbono influência na resistência ao desgaste do aço e
consequentemente no encruamento superficial do aço. Observa-se também a influência
do tamanho do abrasivo e carga aplicada o ensaio.<br>This research aimed to investigate the effect of the carbon content and the size of the
abrasive in the wear resistance and surface hardening phenomenon four Hadfield steel.
For this study , has been assembled , the disc against pin device and abrasive was used
iron sandpapers, with average size between 36 m and 93 micrometers. To achieve the
proposed objectives were defined materials and methods, namely: (a) mounting the pindisk
abrasômetro from a disabled device provided by the LFS-USP; (b) comparing
experimental results - two materials (1045 steel and aluminum 6351) were submitted to
tests performed at university and USP for purposes of comparative studies; (c)
evaluation of the influence of the test parameters - Three abrasive particles with
different sizes and different loads were submitted and evaluated by the abrasive wear;
(d) assessment of the behavior of different steel compositions Hadfield before
abrasiveness tests - steels containing four different carbon contents were subjected to
tests with sandpaper # 220 and # 320; (e) analysis of the worn surfaces - after the tests
of materials different analyzes were performed by scanning electron microscope (SEM)
of worn surfaces. The results obtained with the equipment in the methodology
employed had good reproducibility. There were differences in results between the
equipment and the UFPE USP. On this topic, the abrasive wear Hadfield steel was
influenced by carbon having a relationship in which higher levels showed less wear
effect, different abrasive sizes cause a significant strain hardening effect, which was
observed gain hardness steel with lower carbon content. However, an oscillation of the
abrasive effect on the # 320 was presented. The micrographs revealed microssulcos and
microcuts from test and differences were observed in wear marks when using different
sizes of abrasive particle. In the end, came to the conclusion that the results show that
the influence of carbon content in the wear resistance of steel and consequently the
surface of the steel hardening. It is also observed the influence of abrasive size and load
applied to the test.
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.
Повний текст джерелаАнотація:
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 and wear debris from the
tests using AFS 50/70 showed that delamination was the
primary wear mechanism for the composite materials, with some
ploughing and microcutting, while ploughing and microcutting
were the primary mechanisms in the wear of the steels.
Evaluation of parts made from a composite material which were
removed from service indicated that matrix erosion was the
primary wear mechanism. Tests with Glasgrain fused silica as
the abrasive yielded wear scars with the same morphology as
the parts returned from service, but the very poor flow
characteristics of this material caused inconsistency in the
supply of this abrasive to the contact region.
<p>Interrupted tests showed that the wear rate was constant
for the steels in the non-nitrided condition. After
nitriding, the wear rate increased with test duration. The
nitriding was found to act as a barrier coating providing an
initial period of very low wear until the nitride layer is
broached. The wear rate then increases to approximate the
wear rate of the non-nitrided samples.
<p>It was found that the friction force alters the location
of the maximum normal force, shifting the point of greatest
contact force toward the entry end of the wear scar.<br>Master of Science
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.
Повний текст джерелаАнотація:
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 hardness cannot be guaranteed through the whole cast and the hardest tooth is measured to be around 500 HB. SSABs brand Hardox is the toughest steel on the market. It is extremely wear resistant and has a three time longer service life than ordinary steel. To increase the use of Hardox the possibility to manufacture bucket teeth of three or more plates are examined. This thesis has applied a product development process to mainly develop concepts of the locking system that holds the adapter and tooth together. The locking systems main requirement is to be hammerless, meaning that it is not hammered in, due to the high risk of injury and longer assembly time. Apart from, the geometry of the tooth will be developed to give a better wear resistance. The result is a tooth with at least twice as long service life than the cast competitors and two concepts of locking system. Both locking systems meet the requirement of being hammerless and the sustainability is ensured with calculations of shear force. The geometry of the tooth is design to be self-sharpening, which allows it to stay sharper throughout its service life. Wear test using DEM analysis assure a positive outcome.
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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/.
Повний текст джерелаАнотація:
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 ferramentas de forjamento possuem papel fundamental para possibilitar a produção de lotes maiores sem paradas de máquina devido a falhas. Cerca de 70% das falhas estão relacionadas ao desgaste das ferramentas. Este trabalho buscou identificar no ambiente industrial, os modos de desgaste responsáveis pela degradação da superfície de contato de um punção, fabricado em aço H-10. Um conjunto de punções foi utilizado no forjamento a quente em prensa mecânica excêntrica horizontal e automática de múltiplos estágios, que utiliza água na refrigeração das ferramentas, durante a fabricação de porcas de roda, em aço SAE 1045. Os resultados obtidos basearam-se: (i) nas análises da superfície e da seção transversal de seis punções em microscópio eletrônico de varredura, (ii) na análise da nanodureza e (iii) na variação dimensional e da massa dos punções. Os resultados apontaram para o desgaste da superfície dos punções logo nas primeiras peças forjadas devido à transferência de óxidos do blank para a superfície da ferramenta. Nesta camada transferida para a superfície dos punções, foram encontrados danos causados pelo desgaste abrasivo e pela fadiga térmica.<br>Since the initial development, thousands of years ago, forging has faced continuous improvements, remaining as a modern manufacturing process, capable of adding important characteristics to forged products that are used in numerous applications. In the automotive industry, responsible for the consumption of approximately 60% of all forged products, the forging has proved to be an effective metal forming process in terms of mechanical strength specifications and productivity requirements. This demand for forged parts has stimulated the search for more robust processes in which the forging tool has a fundamental role to enable the production of larger batches without downtime due to failures. Approximately 70% of these failures are related to tool wear. This work aimed identifying, in an industrial environmental, the wear modes responsible for the degradation of the contact surface of a punch, made of H-10 steel. A series of punches was used for hot forging in a horizontal and automatic multi-stage eccentric mechanical press which uses water for tool cooling, during the manufacture of wheel nuts, made of SAE 1045 steel. Results were based: (i) on the analysis of the surface and cross section of six punches in a scanning electronic microscope, (ii) on nanohardness analyses and (iii) as well as on mass and dimensional variations. Results pointed to the punch wear in the first forged pieces, due to oxides transferring from blank to the punch surface. On this transferred layer to punch surface, have also found damage caused by abrasive wear and thermal fatigue.
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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/.
Повний текст джерелаАнотація:
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-de-prova uma pasta abrasiva preparada com carbeto de silício preto, com tamanho médio de partícula de 5 µm. Inicialmente, foram realizados ensaios preliminares, com a finalidade de analisar não só o comportamento do equipamento, mas também estudar a transição entre os modos de desgaste que podem ocorrer durante o desgaste micro-abrasivo. A transição entre os modos de desgaste foi estudada em função da carga normal e dos materiais utilizados durante o ensaio. Os resultados obtidos indicaram boa reprodutibilidade do equipamento e coerência com resultados da literatura. Em seguida, em ensaios denominados definitivos, foram pesquisadas as atuações dos modos de desgaste abrasivo e a obtenção do regime permanente de desgaste. Os resultados mostraram que, com a variação da distância de deslizamento, houve alterações nas ocorrências dos modos de desgaste abrasivo. Por outro lado, em alguns ensaios, o coeficiente de desgaste tendeu a permanecer constante, o que caracteriza a obtenção do regime permanente de desgaste. Entretanto, em outros, o coeficiente de desgaste teve uma evolução aleatória com a distância de deslizamento, fornecendo indicativos de que o desgaste não entrou em regime.<br>This work presents a study on the behavior of different materials under the action of micro-abrasive wear. A micro-abrasive wear testing machine with fixed sphere was designed and constructed, presenting a mechanical configuration with differences with respect to those found in the literature (Gee et al., 2005). M2 tool steel and WC-Co P20 were used as testing specimen materials. Ball materials were cemented AISI 1010 steel and quenched and tempered AISI 52100 steel. During the tests, an abrasive slurry, prepared with black silicon carbide (SiC) particles (average particle size of 5 µm), was supplied to the contact between the specimen and the ball. Initially, preliminary tests were conducted to study the wear mode transitions that can occur during the micro-abrasive wear and to analyze the operational conditions of the equipment. The wear mode transitions were evaluated as a function of the applied normal load and of the materials used. The results indicated good reproducibility and qualitative agreement with those found in the litarature. Later, a new set of tests was conducted, which analyzed the evolution of the abrasive wear modes and the achievement of steady state wear as a function of sliding distance. The results indicated a continuous variation in the abrasive wear modes with sliding distance. Additionally, in some tests, the wear coefficient tended to stabilize in constant value, which characterizes the achievement of steady state regime. However, in other tests, the wear coefficient presented a non constant evolution of wear coefficient with the sliding distance, which denotes that the constant regime of wear was not obtained.
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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Wang, Aiguo. "Abrasive wear of metal matrix composites." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305516.
Повний текст джерела
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Jewell, Gavin. "Three-body abrasive wear of materials." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/7669.
Повний текст джерелаАнотація:
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 increase in wear with an increase in particle size in the size range from 50µm to 180µm and that above an abrasive particle size of approximately 200µm there is a sharp decrease in the wear with increasing particle size, followed by a levelling off in the wear. The wear was found to increase linearly with increasing load. Varying the abrasive feed rate showed that at lower feed rates the abrasive particles were more efficient at removing materials, so the wear was higher than at higher abrasive feed rates. It has also been shown that although the use of ash from coal-fired power stations as an abrasive produces wear of materials, the volume losses were much smaller than those obtained using silica sand and thus it is considered that the tests using silica gave results which were more reliable. The volume losses of alumina ceramics abraded against ash were insufficient to give reliable wear test data and it was concluded' that ash could not be used to rank materials of high hardness. A number of materials were ranked for wear resistance using silica sand abrasive particles. The alumina ceramics and tungsten carbide composite materials showed the best wear performance.
Книги з теми "Abrasing wear"
1
Miyoshi, Kazuhisa. Effect of abrasive grit size on wear of manganese-zinc ferrite under three-body abrasion. National Aeronautics and Space Administration, 1987.
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2
Mashloosh, K. M. Abrasive wear with particular reference to digger teeth. Brunel University, 1987.
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3
Miyoshi, Kazuhisa. Surface analysis and tools. National Aeronautics and Space Administration, Glenn Research Center, 2002.
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4
Miyoshi, Kazuhisa. Surface analysis and tools. National Aeronautics and Space Administration, Glenn Research Center, 2002.
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5
United States. Bureau of Mines. Correlating Abrasive Wear to Alloy Additions in Low-Alloy Steels. s.n, 1986.
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6
Tylczak, J. H. Correlating abrasive wear to alloy additions in low-alloy steels. U.S. Dept. of the Interior, Bureau of Mines, 1986.
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7
Miyoshi, Kazuhisa. Abrasion and deformed layer formation of manganese-zinc ferrite in sliding contact with lapping tapes. National Aeronautics and Space Administration, Lewis Research Center, 1986.
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8
Vermeulen, L. A. Quantitative assessments of abrasive and impactive wear from ball-size distributions in rotary mills. Council for Mineral Technology, 1985.
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9
McCann, J. Abrasion, erosion and wear resistant steels for improved reliability and performance of plant and equipment. Commission of the European Communities, 1986.
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10
Rajagopal, Vathsala. The effect of chromium on the abrasive and corrosive wear of cast iron grinding media. University of Minnesota, 1991.
Знайти повний текст джерелаЧастини книг з теми "Abrasing wear"
1
Garcia Sp, A., V. Lorenzo, A. Varela, C. Camba, and V. Blazquez. "Study of the Abrasive Wear Behaviour of Electrified Railway Wires." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch80.
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2
Larosa, M. A., M. A. Pinto, and M. C. F. Ierardi. "Abrasive Wear Resistance of AISI 420 Stainless Steel After Laser Surface Treatment." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch84.
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3
Krakhmalev, P. "Influence of Microstructure and Coating on the Abrasive Edge Wear of WC-Co." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch96.
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4
Wang, He, Junkun Wei, Guangyu Yan, Haigen Zhao, and Jianing Xu. "Research on TBM Disc Cutter Wear Prediction Based on CSM Model." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_48.
Повний текст джерелаАнотація:
AbstractThe wear of disc cutters significantly impacts the efficiency and cost of TBM operations. In this study, we established a calculation model for radial wear based on the CSM formula and abrasive wear mechanisms. Experimental validation of the wear mechanism confirmed that abrasive wear is the primary mechanism responsible for disc cutter wear. The predictive model was subjected to engineering validation, where the calculated values from the model were compared and analyzed against actual on-site measurements. This validation process confirmed the accuracy and applicability of the model.
5
Timsit, Roland S. "Wear Mechanisms in Electrical Contacts: Abrasive Wear." In Encyclopedia of Tribology. Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_423.
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Karlsohn, M., A. Röttger, P. A. Silva, et al. "Hot Direct Extrusion of Abrasion Resistant Fe-Base Metal Matrix Composites - Microstructure and Wear Properties." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch17.
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Wang, Kaiming, Wei Liu, Xiaotong Pang, Yongle Hu, and Yonggang Tong. "Research Progress of Remanufacturing Technology in the Field of Construction Machinery." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_63.
Повний текст джерелаАнотація:
AbstractExcavator bucket teeth are often in direct contact with abrasive particles in the soil during work, resulting in the tip being severely worn. This study used laser cladding to synthesize (Ti, Nb)C reinforced coatings on the surface of Q550 steel of bucket teeth of commonly used excavators to improve the wear resistance, and researches the effects of different Ti, Nb, Cr3C2 powder ratios on the hardness, wear resistance, and wear loss of laser cladding (Ti, Nb)C reinforced coatings. The results show that the optimal powder ratio is 80% Ni-based + 1.26% Ti + 7.54% Nb + 11.2% Cr3C2. Under the optimal powder ratio, the hardness of the coating is 213.4 HV, the wear amount is 32.7 mg, and the wear failure form is abrasive wear and slight adhesive wear.
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Klüppel, Manfred. "Wear and Abrasion of Tires." In Encyclopedia of Polymeric Nanomaterials. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_312-1.
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Klüppel, Manfred. "Wear and Abrasion of Tires." In Encyclopedia of Polymeric Nanomaterials. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_312.
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Silva, P. A., S. Weber, M. Karlsohn, et al. "Hot Direct Extrusion of Abrasion Resistant Fe-Base Metal Matrix Composites - Interface Characterization and Mechanical Properties of Co-Extruded Layered Structures." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch90.
Повний текст джерелаТези доповідей конференцій з теми "Abrasing wear"
1
Kotlyar, D., C. H. Pitt, and M. E. Wadsworth. "Simultaneous Corrosion and Abrasion Measurements under Grinding Conditions." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87445.
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Abstract The contribution of corrosion to the abrasive-corrosive wear of high carbon low alloy steel (HCLA), commonly used for grinding balls, was evaluated in 15% quartz slurries. Results were compared with similar results for mild steel. The magnitude of the synergistic effect of corrosion and abrasion was determined for various conditions of applied load, hardness and pH. Measurements were made using a specially constructed "rotating cylinder-anvil" apparatus. The synergistic effect is considerable even if the corrosion component of the wear is small. The macroremoval of metal particles, producing the synergistic effect, may be considered to be due to the initiation and propagation of pitting and/or microcracks assisted by anodic corrosion. Corrosion of HCLA steel increased with higher load and lower pH. The magnitude of the corrosive-abrasive wear is determined essentially by pure abrasion and the synergistic effect.
2
Adane, Kofi Freeman, Martin Huard, Hadrian D’Souza, and Aaron Fuhr. "A Discussion on Modeling Abrasive-Wear in Slurry Systems." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16678.
Повний текст джерелаАнотація:
Abstract Slurry systems are used for processing and transportation of mined ore, mineral or metal concentrates, tailings, solid wastes, etc. in the oil and gas, mining and wastewater industries. The handling, processing and transporting of these slurries can result in significant equipment wear. Depending on the solid concentrations and equipment geometry, there are different kinds of wear that can occur, such as impact or erosion and abrasion. Understanding the types of wear or damage mechanisms will aid in selecting and/or developing appropriate models to predict wear rate. In this work, we discuss abrasive wear in the context of slurry flow conditions, available models and their shortcomings, and application of computational fluid dynamics (CFD) to predict abrasive wear. In addition, some suggestions for modeling strategies have been presented and discussed.
3
Jang, J. W., I. Iwasaki, and J. J. Moore. "The Effect of Galvanic Interaction between Martensite and Austenite in Grinding Media Wear." In CORROSION 1988. NACE International, 1988. https://doi.org/10.5006/c1988-88241.
Повний текст джерелаАнотація:
Abstract Galvanic currents between austenitic and martensitic phases in a microstructure and between pyrrhotite and the two phases were determined directly by measuring galvanic currents and indirectly by using polarization curves under non-abrasive and abrasive conditions in a quartz slurry. A good agreement was found when the corrosion currents measured by electrochemical methods were compared with the corrosion currents estimated from marked ball wear tests. The rates of passive film formation controlled the corrosion currents of the high chromium steel grinding balls in a mill. The passivation kinetics model was proposed by using polarization curves under abrasion at different rotating speeds.
4
Le Manchet, Sandra, and Antoine Proust. "Abrasion-Corrosion Resistance of Stainless and Wear-Resistant Steels for Oil Sands Applications." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07036.
Повний текст джерелаАнотація:
Abstract Oil sands operations may give rise to various corrosion risks such as pitting corrosion, crevice corrosion, microbiologically influenced corrosion and abrasion-corrosion. These risks are mainly related to the chemical composition of the slurry and the presence of abrasive particles or rocks. That is why the corrosion resistance is a critical parameter that has to be taken into account for material choice to avoid regular maintenance of the process equipment. This paper focuses on the abrasion-corrosion resistance of various stainless steels and wear-resistant carbon steels. The abrasion-corrosion tests were conducted by means of an innovative test method in environments containing chlorides in a pH range from 3 to 9. The results show that wear-resistant steels are more resistant to abrasion-corrosion than stainless steels in environments containing a low amount of chlorides when the pH is basic. On the contrary, in more corrosive environments, wear-resistant steels are susceptible to corrosion. In such environments, duplex stainless steels are more resistant to abrasion-corrosion and can be considered as excellent candidate materials for various applications like piping systems for instance.
5
Adane, Kofi Freeman, Aaron Fuhr, and Martin Huard. "Modeling Abrasion-Corrosion in Horizontal Pipeline Slurry Flows." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13125.
Повний текст джерелаАнотація:
Abstract Abrasion-corrosion wear rates in horizontal pipeline slurry flow were modelled using novel semi-empirical and numerical approaches. The numerical approach, computational fluid dynamic (CFD) was only used to model abrasive wear. The abrasive wear model that came with the CFD software was also used. The novel semi-empirical approach adopts several existing models to predict abrasion-corrosion wear rates. The objective of the study was to assess a simple tool that can be used to identify risk, perform “what-if-scenarios” and/or pipeline system optimization, especially situations where there is no accurate measured or computed local flow parameters available. Predicted results were compared with previously acquired hydrodynamic and wear data in our pilot-scale slurry flow loop for both mild steel and dual-phase stainless steel pipe spools. Slurry consisted of sand mixed with municipal water. The study was done in a 193.7 mm (7.625 in) horizontal pipe with mixture velocity of 4.5 and 7 m/s at solids concentration of about 20 v/v% and dissolved oxygen concentration of 1.0 ppm. Our proposed novel modeling approach results were found to be in reasonable agreement with measured data, and can easily be integrated with existing hydrodynamic models or tools. However, further improvement maybe required if quantitative accuracy is needed. The abrasive model that came with CFD software package fails to predict both wear pattern and magnitude. It seems to be somewhat inversely correlated with wall shear stress which is contrary to measured data. Also, CFD fails to predict expected solids velocity profile in stratified or slurry flow with moving bed. Further investigation is required for this flow regime.
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Jones, Denny A. "Fundamentals of Corrosive Wear in Wet ORE Grinding Systems." In CORROSION 1985. NACE International, 1985. https://doi.org/10.5006/c1985-85363.
Повний текст джерелаАнотація:
Abstract Wear processes in ball and rod mills have received increased recent attention in order to increase efficiency, conserve grinding media, and thereby reduce costs. Direct removal of metal from grinding media surface by abrasive wear is present in both dry and wet grinding. Additional corrosive wear is apparent during wet grinding in which less resistant corrosion product films are abraded away. Inhibitors and higher pH solutions, in which corrosion product films are more tenacious, improve wear resistance during wet grinding. Softer surfaces are less resistant to corrosive wear. Thus, film formation and subsequent film abrasion on newly furrowed surfaces must be a factor.
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Zhuk, Yuri N. "Nano-Structured CVD Tungsten Carbide Coating Protects against Wear and Corrosion." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10260.
Повний текст джерелаАнотація:
Abstract Drilling tools operate in extremely abrasive, erosive and corrosive environments which reduce tool life, especially in the case of sour well applications. This paper discusses a new family of low temperature Chemical Vapour Deposition (CVD) Tungsten Carbide coatings proven to increase tool life and thus reduce expensive downtime and drilling operation costs particularly in new frontier, harsh and difficult drilling conditions. The coating consists of Tungsten Carbide nano-particles dispersed in a metal Tungsten matrix which results in enhanced hardness and abrasion resistance. The coating can be produced up to 100 microns thick, which is unique for hard CVD coatings. As a nano-structured material, it demonstrates outstanding toughness, crack and impact resistance. The gas-phase CVD process enables the coating of internal surfaces and complex designs such as valves, hydraulic components and pump cylinders. The pore-free coating is resistant to acids and aggressive media. This combination of wear resistance and chemical resistance makes CVD Tungsten Carbide coating an attractive solution to coat critical components in high wear and/or aggressive media environments including downhole tools, mud-driven hydraulic systems, pumps for abrasive fluids, valves and aerospace applications. CVD Tungsten Carbide coating is an attractive replacement for Hard Chrome, which is to be phased-out due to environmental and health and safety considerations.
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May, D. R., and R. Brown. "Abrasion - Corrosion of Steels in Seawater." In CORROSION 1985. NACE International, 1985. https://doi.org/10.5006/c1985-85193.
Повний текст джерелаАнотація:
Abstract Weight loss and potential measurements were made for a 1022 steel with a ferrite and pearlite structure, a 1022 steel with a martensite structure, a 1045 steel with a ferrite and pearlite structure and a quenched and tempered 4140 steel when abraded against Si C in seawater. The 4140 steel exhibited the best abrasion corrosion resistance possibly due to the microstructure and the surface layers formed during abrasion. The martensitic 1022 was next best primarily due to its high hardness reducing abrasive wear. The ferrite and pearlite 1022 steel showed better resistance than the 1045 steel with the same structure. The increased carbide volume and its microstructural form were thought responsible for the 1045 steel's poor resistance to abrasion-corrosion.
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Ambrisko, Lubomir, Dusan Kubala, Lucia Cabanikova, and Marek Ondov. "EVALUATION OF THE WEAR OF THE CARRYING ROLLERS OF BELT CONVEYORS." In 24th SGEM International Multidisciplinary Scientific GeoConference 24. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/1.1/s03.38.
Повний текст джерелаАнотація:
The basic structural and functional element of a belt conveyor is the conveyor belt, which is supported by carrying rollers. Research in this area is important for increasing the service life of mining belt conveyor components. The rollers are subject to various forms of wear. Tribological interactions between the roller, the conveyor belt, and the particles of the transported material or impurities from the environment that enter the tribological system cause various forms of mechanical wear. Abrasion is the predominant type of wear for a given friction node. Abrasive wear causes tearing and cutting of the surface of the rollers. Moreover, they are also subject to chemical wear, namely corrosion of the damaged steel shells of the rollers. The combination of the individual types of wear led to damage that affected the thickness of the roller shell and its basic mechanical property, namely Vickers hardness. In this paper, non-destructive testing methods were applied, while the hardness was determined by the UCI (Ultrasonic Contact Impedance) method and the shell thickness was determined by the ultrasonic method.
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Badisch, E., P. Geiderer, R. Polak, and F. Franek. "Design of Abrasion Resistant Surfaces by Textures on Macroscopic Size." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63884.
Повний текст джерелаАнотація:
Although abrasive wear is a predominant type of wear in almost all fields of industry, it is particularly relevant to the field of mining and mineral processing. This wear mechanism is mainly influenced by the abrasive particle (e.g. hardness, size, shape, mass), the wear kinematics (impact angle, impact velocity), and also by the worn material itself (e.g. surface, structure, hardness). Today, a lot of work is done to develop systems which are resistant against wear caused by mineral abrasives. One goal for higher abrasion resistance is the use of macroscopic surface textures which hinder the abrasive particles from hitting unprotected surface areas (especially for dry, coarse abrasives) or force the formation of surface adherent mineral embedment which leads to a self-protection effect (especially for fine, wet type of abrasives). However, there is a serious lack of systematic and scientific knowledge for the design of abrasion resistant surfaces. The aim of this study was to evaluate the efficiency of macroscopic surface textures on their ability of minimizing abrasive attack, finally with the purpose to establish design rules for abrasion resistant surfaces. Profile geometry, profile distribution and surface arrangements were investigated on the wear protecting properties. It could be observed that the surface protection factor against abrasion can be adjusted by distribution and surface coverage. A strong influence of the grain size of the abrasives used on the wear behavior was observed.
Звіти організацій з теми "Abrasing wear"
1
Lever, James, Susan Taylor, Garrett Hoch, and Charles Daghlian. Evidence that abrasion can govern snow kinetic friction. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42646.
Повний текст джерелаАнотація:
The long-accepted theory to explain why snow is slippery postulates self-lubrication: frictional heat from sliding melts and thereby lubricates the contacting snow grains. We recently published micro-scale interface observations that contradicted this explanation: contacting snow grains abraded and did not melt under a polyethylene slider, despite low friction values. Here we provide additional observational and theoretical evidence that abrasion can govern snow kinetic friction. We obtained coordinated infrared, visible-light and scanning-electron micrographs that confirm that the evolving shapes observed during our tribometer tests are contacting snow grains polished by abrasion, and that the wear particles can sinter together and fill the adjacent pore spaces. Furthermore, dry-contact abrasive wear reasonably predicts the evolution of snow-slider contact area and sliding-heat-source theory confirms that contact temperatures would not reach 0°C during our tribometer tests. Importantly, published measurements of interface temperatures also indicate that melting did not occur during field tests on sleds and skis. Although prevailing theory anticipates a transition from dry to lubricated contact along a slider, we suggest that dry-contact abrasion and heat flow can prevent this transition from occurring for snow-friction scenarios of practical interest.
2
Ives, L. K. Abrasive wear by diesel engine coal-fuel and related particles. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/10188975.
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3
Ives, L. K. Abrasive wear by coal-fueled diesel engine and related particles. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7083688.
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4
Ives, L. K. Abrasive wear by coal-fueled diesel engine and related particles. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10183382.
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5
Ives, L. K. Abrasive wear by coal-fueled diesel engine and related particles. National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4811.
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Fenske, George, and Oyelayo Ajayi. An Abrasion Wear Model of Rotary Shear Comminution of Biomass Feedstock. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1819740.
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7
Kudin, Roman, Niranjan Singh, Prabhat Chand, Anura Bakmeedeniya, and Jone Tawaketini. Estimating Emissions from Tyre Tread Wear of Motor Vehicles. Unitec ePress, 2024. http://dx.doi.org/10.34074/ocds.108.
Повний текст джерелаАнотація:
Over 5.6 million road vehicles are registered in New Zealand, with a wide range of contaminants released as a result of their operation. The material wearing out from tyre tread has previously been identified as a contaminant of potential concern (COPC) in New Zealand, but its amount has not been quantified. Numerous studies confirm that the wear rate of a tyre depends on multiple factors and can vary significantly, even for the same type of vehicle with the same tyres installed. Such factors have already been classified and weighted; therefore, they were not the subject of the current research. The aim of this study is to estimate the total amount of material released into the environment in New Zealand due to the tread wear of tyres. In this research, the New Zealand motor vehicle fleet was divided into categories according to the available statistical data. The estimation of the amount of the tyre material released into the environment was done separately in each category of vehicle, using the three-point method (Low, Medium and High). The calculation was performed using the statistical average annual distances driven by vehicles, and the tyre abrasion rates, also called emission factors (mg/km). The emission factors were adopted through a thorough review of the available studies of tyre abrasion rates in different countries. The three-point estimate shows that every year roughly 6.5 to 15.5 thousand tonnes of material from tyre tread wear is released into the environment in New Zealand, which gives between 1.26 and 2.97 kg when converted per capita. Such quantification is an important step in understanding the impacts of this contaminant on New Zealand ecosystems. Further research of tyre tread wear material is needed with regard to its emission factors; deposition, migration and concentrations in environmental compartments; accumulation and degradation paths; effects on living organisms and human health.
8
Gittleman, Gregory M. Abrasive Wear of Four Direct Restorative Materials by Standard and Whitening Dentifrices. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ad1012923.
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Fenske, George, and Oyelayo Ajayi. An Abrasive Wear Model of Knife Milling to Predict the Impact of Material Properties and Milling Parameters on Knife Edge Recession. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1818971.
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MALDONADO, KARELYS, JUAN ESPINOZA, DANIELA ASTUDILLO, and WILSON BRAVO. Fatigue and fracture resistance and survival of occlusal veneers of composite resin and ceramics blocks in posterior teeth with occlusal wear: A protocol for a systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2021. http://dx.doi.org/10.37766/inplasy2021.10.0036.
Повний текст джерелаАнотація:
Review question / Objective: The aim of this systematic review is to synthesize the scientific evidence that evaluates fatigue and fracture resistance, survival, and stress distribution, of composite resin CAD/CAM and ceramic CAD/CAM occlusal veneers in posterior teeth with severe occlusal wear. Condition being studied: Currently there is an increase in cases of dental wear, due to several factors such as: excessive consumption of carbonated drinks, a diet high in acids, gastric diseases, anorexia, bulimia, dental grinding, use of highly abrasive toothpastes, or a combination of these(9) (10) (11) (12); which affect the patient in several aspects: loss of vertical dimension, sensitivity due to the exposure of dentin, esthetics, affectation of the neuromuscular system(11) (13) (14). With the advent of minimally invasive dentistry, occlusal veneers have been found to be a valid option to rehabilitate this type of cases and thus avoid greater wear of the dental structure with full coverage restorations. Sometimes when performing a tabletop it is not necessary to perform any preparation, thus preserving the maximum amount of dental tissue(3) (6) (15). Due to the masticatory load either in patients without parafunction where the maximum masticatory force is approximately 424 N for women and 630 N for men or in those who present parafunction where the maximum bite force can vary from 780 to 1120N(7), it is necessary that the occlusal veneers support that load which makes indispensable a compilation of studies investigating both fatigue and fracture resistance and the survival rate of occlusal veneers in different materials and thicknesses.