Artykuły w czasopismach: „TRIBOLOGICAL INVESTIGATIONS”

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Bieger, T., i U. Wallrabe. "Tribological investigations of LIGA-microstructures". Microsystem Technologies 2, nr 1 (marzec 1995): 63–70. http://dx.doi.org/10.1007/bf02739532.

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Tewari, U. S., i J. Bijwe. "Tribological investigations of polyetherimide composite". Journal of Materials Science 27, nr 2 (1992): 328–34. http://dx.doi.org/10.1007/bf00543920.

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Bieger, T., i U. Wallrabe. "Tribological investigations of LIGA-microstructures". Microsystem Technologies 2, nr 2 (15.02.1996): 63–70. http://dx.doi.org/10.1007/s005420050017.

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Bieger, T., i U. Wallrabe. "Tribological investigations of LIGA-microstructures". Microsystem Technologies 2, nr 2 (maj 1996): 63–70. http://dx.doi.org/10.1007/bf02447752.

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Legros, A., M. Diny, H. Zaïdi i V. Lemort. "Investigating high temperature solid lubricant material for a scroll expander". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235, nr 1 (22.10.2020): 233–41. http://dx.doi.org/10.1177/1350650120967509.

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In the context of a waste heat recovery application on a gasoline engine, tribological investigations have been mandatory in the design of a scroll expander. A new design has been proposed to reach higher temperature and investigations are made to ensure that the material of the parts in contact will provide good tribological performances, i.e. a low coefficient of friction and a low wear rate. This research will also prevent high mechanical losses in the machine and, therefore, increase its thermal efficiency. Some experiments have been conducted on six different materials for the tip seal of the expander and two materials for the counter face. Additionally, the experiments have been carried out for a dry and a steam-lubricated contact at several temperatures. This research does not aim to be an exhaustive tribological investigation but instead offers a first comparison between the different materials couples.

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Böhmermann, Florian, i Oltmann Riemer. "Methodology for Reliable Tribological Investigations Applying a Micro Tribometer in Ball-on-Plate Configuration". MATEC Web of Conferences 190 (2018): 15011. http://dx.doi.org/10.1051/matecconf/201819015011.

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Aim of this work is the development of a methodology for reliable tribological investigations when applying a micro tribometer. Experiments were conducted in ball-on-plate configuration with linear reciprocating motion. Two different sphere materials were applied: Al99.9 aluminum alloy and 1.4301 austenitic stainless steel. A textured surface from 1.2379 hardened tool steel machined by micro milling exhibiting an areal arithmetic mean height of Sa = 295 nm was used as counterpart. The experiments comprised of the investigation of the coefficient of friction and the evolution of the facet area on the spheres in contact with the textured surface depending on the normal load applied and the number of reciprocating cycles. For the early stage of the experiments an ongoing increase of the area of the facet on the spheres was found; occurring friction was manly governed by abrasion of the sphere’s material and three-body deformation. This was considered as unstable state of the tribological investigation process, not producing meaningful results. For the later stage equilibrium facet areas on the spheres were found and an ongoing conduction of the tribological experiments did not provoke any increase of their sizes. Here, occurring friction was mainly governed by adhesion. The final facet area on a sphere was directly dependent on the sphere’s materials and the applied normal loads. For all subsequent investigations applying a micro tribometer, only spheres exhibiting an equilibrium facet area should be used to gain robust results of tribological investigations, required for the development of e.g. dry deep drawing processes.

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Overney, R., i E. Meyer. "Tribological Investigations Using Friction Force Microscopy". MRS Bulletin 18, nr 5 (maj 1993): 26–34. http://dx.doi.org/10.1557/s0883769400047096.

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Many attempts have been made in recent centuries to investigate friction, adhesion, lubrication, and wear. Most of the experimental approaches and theories were based on macroscopic experiments, such as tensile and indentation tests. For a long time, only the bulk properties of the materials were considered.Late in this century a new term was created combining all of the above-mentioned properties which deal with the science of interacting material interfaces in relative motion: tribology. The state of the art of science today reveals that processing in nature depends strongly on interfaces that cannot be described only by bulk properties. Tribologists realize they must study the sliding surfaces by analytical surface-science tools. With the surface force apparatus developed by J.N. Israelachvili and D. Tabor, we have a surface analysis tool that provides new insight into the field of macroscopic sliding contact of lubricated systems.After Amontons' laws were established as a first attempt to describe sliding friction analytically, theories were advanced over the course of this century. A classic discipline was developed: contact mechanics. More quantitative treatments of friction were developed by various authors. The energy dissipation in most processes in tribology induced the theorists to consider the sliding bodies as spring models creating phonon-phonon interactions. And with modern computer facilities, they started to perform computational experiments whenever classical experiments could not provide information on the submicron scale.

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Gatzen, Hans H., i Michael Beck. "Tribological investigations on micromachined silicon sliders". Tribology International 36, nr 4-6 (kwiecień 2003): 279–83. http://dx.doi.org/10.1016/s0301-679x(02)00198-6.

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Sharma, V., F. E. Talke i Q. Ng. "Tribological investigations of tri-pad sliders". IEEE Transactions on Magnetics 32, nr 5 (1996): 3651–53. http://dx.doi.org/10.1109/20.538717.

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Wang, Ran, Yuanjing Zhu, Chengxin Chen, Yu Han i Hongbo Zhou. "Tooth Wear and Tribological Investigations in Dentistry". Applied Bionics and Biomechanics 2022 (9.06.2022): 1–11. http://dx.doi.org/10.1155/2022/2861197.

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Dental or tooth wear is a physiological process in the life cycle of teeth. Loss of the occlusal surface may cause excessive tooth wear. Several factors may contribute to tooth wear with different intensities and duration in the oral cavity. The oral cavity is generally compared to a tribological system to determine the various types of wear between teeth and restorative materials and assess the amount of dental wear. However, it is challenging to investigate in vitro and in vivo wear owing to the complexity of tooth wear; thus, a clear correlation between in vitro and in vivo data could not be established. This review is aimed at providing an insight into the etiology of tooth wear and tribological investigations in dentistry.

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Richter, A., M. Mueck, M. Gruner, D. Klaffke i M. Hartelt. "Tribological investigations of diamond–metal grinding pads". Wear 259, nr 7-12 (lipiec 2005): 1123–27. http://dx.doi.org/10.1016/j.wear.2005.02.117.

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ZHANG, Wenguang. "Tribological investigations of sol-gel ceramic films". Science in China Series B 45, nr 1 (2002): 84. http://dx.doi.org/10.1360/02yb9012.

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., Veeresha G. "SOME TRIBOLOGICAL INVESTIGATIONS ON ZINC BASE ALLOY". International Journal of Research in Engineering and Technology 05, nr 06 (25.06.2016): 70–74. http://dx.doi.org/10.15623/ijret.2016.0506014.

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Orgeldinger, Christian, Armin Seynstahl, Tobias Rosnitschek i Stephan Tremmel. "Einfluss fertigungsbedingter Effekte auf das tribologische Verhalten im ADAM-Verfahren gedruckter Bauteile". Tribologie und Schmierungstechnik 69, nr 5-6 (15.02.2023): 28–33. http://dx.doi.org/10.24053/tus-2022-0042.

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Additive manufacturing processes have become increasingly important in recent years. However, the use of additive manufactured components in tribological applications – especially for metallic components – has still been little investigated. This work analyzes the extent to which components printed with the Atomic Diffusion Additive Manufacturing (ADAM) process are suitable for use in tribomechanical systems. The focus is on the tribological behavior of the tool steel D2 against 100Cr6 counterparts under lubrication with deep drawing oil, taking direction-dependent manufacturing effects into account. The first tribological investigations with the ADAM process show great optimization potential for possible applications in the field of forming technology. The surface treatment of the samples has proven to be mandatory in the investigations.

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Reichardt, Gerd, i Mathias Liewald. "Characterization of an Environmentally Friendly Tribological System for Deep Drawing Using Volatile Media as Lubricant Substitute". Defect and Diffusion Forum 414 (24.02.2022): 75–80. http://dx.doi.org/10.4028/p-65utsh.

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Commonly used lubricants in sheet metal forming usually base on mineral or synthetic oils, water based emulsions, drawing films or hotmelts (waxes). However, these conventional lubricants often contain harmful substances to human health and the environment. For this reason, a novel tribological system for dry metal forming has been developed. Basic principle of this new tribological system comprises the use of volatile media such as CO2 (liquid) and N2 (gaseous), which are injected into the contact interface under high pressure via injectors integrated into the tool. The volatile media used, lead to a significant reduction in friction and ensure robust friction behavior in deep-drawing processes. The investigations reported about in this contribution particularly focus on the friction behavior occurring in this tribological system at highly loaded radii. The friction investigations were carried out by using a modified stretch-bending-test and showed the effects of the main process-influencing parameters. In the present paper, these results are compared to already published results of the friction behavior investigated by means of flat strip drawing investigations. The findings obtained in this way allow a better understanding and prediction of the tribological system´s properties, thus making it usable for sheet metal forming applications.

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Müller, Martina, Rafael Hild, Daniel Trauth i Thomas Bergs. "Investigation of different tribological systems during full forward impact extrusion of aluminum alloy EN AW 6082". Industrial Lubrication and Tribology 72, nr 6 (9.12.2019): 709–12. http://dx.doi.org/10.1108/ilt-08-2019-0316.

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Purpose The modification of the tribological system is an essential aspect of the implementation of resource-saving processes in cold forming. As a result, the focus of this contribution is the influence of the tribological system on the full forward impact extrusion of aluminum alloy EN AW 6082 (T6) with regard to reduction of friction and wear. Design/methodology/approach The investigations included a variation of lubricant and die treatment. Friction, wear and the mean arithmetic height Sa were used as evaluation criteria. The aim was to find a suitable die surface treatment and a suitable lubricant on the basis of the evaluation criteria. Findings The experiments indicated that each of the selected tribological systems prevents physical metallic contact between tool and workpiece and thus prevents the formation of wear. Nevertheless, differences were found in the areas of smoothing of workpiece surfaces and adhesive strength of lubricants. Originality/value As general cause effect relationships between die coating and lubricant are not known in the field of bulk metal forming of aluminum, fundamental investigations are described below. The investigations focus on the influence of the material and the tribological system on friction as well as wear. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0316

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Schulze, Marcus, Holger Seidlitz, Franziska Konig i Sabine WeiB. "Tribological Investigations of PVD Coated Multi-Layer Constructions". Journal of Materials Science Research 5, nr 1 (29.12.2015): 97. http://dx.doi.org/10.5539/jmsr.v5n1p97.

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<p class="1Body">Multi-layer constructions become more and more relevant in lightweight applications due to their high strength to weight ratio. They offer excellent crash, damping and recycling properties. Also, the morphology of thermoplastic carbon fibre reinforced plastics (CFRP) render them interesting for large scale manufacturing processes. Nevertheless, a major disadvantage results in a poor resistance against wear and tear, e.g. erosion, which is attributed to weak hardness properties. Hence, this work deals with tribological investigations on orthotropic carbon fibre reinforced polymers (PA 6) either with protective ceramic coating or without. The chosen coating system is a well-known protective covering of metal components, e.g. metal cutting tools, produced by physical vapor deposition (PVD). To characterize the coating system on thermoplastic CFRP, standard analyzing methods are utilized, like optical and scanning electron microscopy (SEM). The tribological investigations are conducted by the tribological ball on disk method to generate wear tracks on the sample surfaces and hence to calculate the wear rates. These results are compared to literature findings with respect to a certain protective coating system (TiN) and a second nano-structured gel coating system, where both systems are deposited on a thermosetting material, i.e. carbon fibre reinforced epoxy resin, respectively. For this purpose the feasibility of depositing a protective ceramic layer on thermoplastic CFRP is demonstrated. First results on suitable surface pre-treatments have shown a significant influence on the coating quality. The improved performance regarding the wear behavior with respect to tribology compared to the poor substrate and existing technologies is shown additionally.</p>

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Służałek, Grzegorz, Piotr Jan Duda i Henryk Wistuba. "Tribological Characteristics of Anodic Oxide Coat (AOC) Modified - Sealed up the Polymer". Solid State Phenomena 199 (marzec 2013): 209–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.209.

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The paper represents the results of investigations conducted on the tribological test for the conditions of the friction of technically dry. Analysis stereological counter-specimen was subjected from AOC and AOC modified sealed up the polymers that is composites coats. Polymerization occurred at a temperature below the recrystallization temperature of the alloy EN AW 5251. The values of the coefficient of the friction, and the results of investigations AFM (atomic force microscopy) and the parameters of the roughness were compared. The tribological properties composites are investigated by using the pin-on-disk type rotational wear tester T-01 M. This paper shows models 3D of the AOC modified polymer and the mechanism of wearing. Tribological measurements show reduced wear and friction of the composite coatings as compared with the pure anodic oxide

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HARTH, K., H. HIBST, H. MANNSPERGER, H. P. SCHILDBERG i A. WERNER. "TRIBOLOGICAL INVESTIGATIONS OF METALLIC LAYERS ON FLEXIBLE SUBSTRATES". Journal of the Magnetics Society of Japan 13, S_1_PMRC_89 (1989): S1_69–72. http://dx.doi.org/10.3379/jmsjmag.13.s1_69.

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Wilkening, Lars, Hans-Guenther Paul i Georg Peter Ostermeyer. "Investigations on Tribological Memory Effects in Friction Materials". SAE International Journal of Passenger Cars - Mechanical Systems 7, nr 4 (28.09.2014): 1264–73. http://dx.doi.org/10.4271/2014-01-2481.

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KORNILUK, WIKTOR, i KORNELIUSZ DUBICKI. "Investigations on the tribological properties of polyamid 6". Polimery 33, nr 06 (czerwiec 1988): 231–33. http://dx.doi.org/10.14314/polimery.1988.231.

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Zhang, Y. Z., L. X. Jia, Y. P. Niu i S. M. Du. "Stepping behaviors based on tribological and dynamical investigations". Wear 306, nr 1-2 (sierpień 2013): 219–25. http://dx.doi.org/10.1016/j.wear.2013.03.031.

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Merkle, A., i L. Marks. "Dynamic In-situ TEM Investigations of Tribological Interfaces". Microscopy and Microanalysis 12, S02 (31.07.2006): 950–51. http://dx.doi.org/10.1017/s1431927606063811.

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Harth, K., H. Hibst, H. Mannsperger, H. P. Schildberg i A. Werner. "Tribological investigations of metallic layers of flexible substrates". IEEE Transactions on Magnetics 26, nr 1 (1990): 156–58. http://dx.doi.org/10.1109/20.50521.

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Laschitsch, Alexander, i Diethelm Johannsmann. "High frequency tribological investigations on quartz resonator surfaces". Journal of Applied Physics 85, nr 7 (kwiecień 1999): 3759–65. http://dx.doi.org/10.1063/1.369745.

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Ciulli, E. "Tribology research trends in Italy". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 223, nr 8 (22.05.2009): 1091–113. http://dx.doi.org/10.1243/13506501jet543.

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This article furnishes a survey of recent investigations and of the current tribology research trends in Italy. Several topics related to tribology are investigated in several different departments of universities, research centres, and industries. Some basic studies on friction and lubrication at the atomic-scale level are also reported. A big effort is addressed to researches on surface topography, contact mechanics aspects, and particularly on surface coatings and treatments. Indentation and scratching techniques are used for the characterization of both coatings and bulk materials down to the nanoscale. Mechanical characterization of materials and mat- erial processing involve tribological aspects too. Investigations on the wear behaviour of different materials for applications in the field of biotribology are also being carried out. The increasing interest of the industrial world in tribological problems is producing a lot of collaborations among universities, research centres, and industries. Several tribological components and practical applications are investigated, such as lubricated sliding bearings, gas and magnetic bearings, gears, sealing systems, and automotive and rail components. Investigations are often completed by diagnostic studies for monitoring or maintenance purposes.

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Leszczyńska-Madej, Beata, Marcin Madej, Joanna Hrabia-Wiśnios i Aleksandra Węglowska. "Effects of the Processing Parameters of Friction Stir Processing on the Microstructure, Hardness and Tribological Properties of SnSbCu Bearing Alloy". Materials 13, nr 24 (21.12.2020): 5826. http://dx.doi.org/10.3390/ma13245826.

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In the study, the friction stir processing (FSP) method was used to modify the surface layer of a tin-based bearing alloy. The modification was aimed at extending the service life of bearings by improving their tribological properties. The results of investigations of the microstructure, hardness and tribological properties of the SnSbCu bearing alloy after FSP using various rotational speeds of the tool—280, 355, 450 and 560 RPM—and the constant traverse speed of 355 mm/min are presented. Particular attention was paid to the possibility of changing the morphology of the precipitates present in the alloy, and to the impact of this parameter on improvement of the tribological properties. The research carried out in this paper covered investigations of the microstructure using light and scanning electron microscopy (SEM) along with analysis of the chemical composition in micro-areas and Brinell hardness tests. Additionally, the sizes of the SnSb and CuSn precipitates present in the microstructure before and after the modification process were determined, as were the tribological properties under technically dry friction conditions and lubrication with TU 32 oil. It was proven that using friction stir processing favors refinement of the microstructure and improves the tribological properties of the analyzed alloy.

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Müller, Christoph, Lena Rudel, Deniz Yalcin i Peter Groche. "Cold Forging with Lubricated Tools". Key Engineering Materials 611-612 (maj 2014): 971–80. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.971.

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Cold forging processes require high-capability tribological systems in order to ensure sound forming results. Due to a rising ecological awareness, alternatives to the established and reliable conversion coatings are necessary. Single bath systems like polymers and salt wax coatings with integrated lubrication appear to be the most promising approach to prevent galling. For an optimization and investigation of the tribological system a definition of the tribological loads is necessary. However, only insufficient values are available in literature. Especially, long sliding distances, which occur in multistage operations, can cause a breakdown of the lubricant. Therefore, approaches are necessary to enable long sliding distances. This paper presents the results obtained with a cold forging tribometer, the Sliding Compression Test, which reveal the high impact of remaining lubricant on the friction coefficient. Also, tests with prelubricated tools show the ability to reduce the friction and the results of investigations with rough tool surfaces are presented.

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Wang, Cheng, Jianlin Cai, Gong Cheng, Jiaxu Wang i Dongxing Tang. "Numerical Investigations of Tribological Characteristics of Biomimetic-Textured Surfaces". Sustainability 15, nr 17 (30.08.2023): 13054. http://dx.doi.org/10.3390/su151713054.

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Rail transportation has dramatically improved travel convenience, but it has also led to environmental pollution and energy consumption issues. These challenges can be partially addressed by reducing friction loss in the mechanical transmission of rail systems. This paper examines the tribological properties of bionic-textured surfaces inspired by snake- and sharkskin. This study focuses on generating bionic textured surfaces with randomly distributed peaks through numerical simulation and connecting them to a transient Reynolds equation and friction fatigue model. The bionic surface wear lubrication model considers the lubricating film’s thickness and contact pressure obtained from the GT model. The results reveal that the existence of a bionic texture can reduce the friction coefficient and wear amount on the contact surface. The findings of this study not only offer a potential solution for reducing energy consumption and emissions in intelligent rail transit systems but also hold promise for providing further insights into the numerical simulation of bionic weaving and the investigation of tribological characteristics.

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Grygier, Dominika, Piotr Kowalewski i Angelika Radzińska. "INFLUENCE OF CORROSION PROCESSES ON FRICTION AND WEAR OF TIN COATINGS OF WIRE CONNECTORS". Tribologia 294, nr 6 (12.04.2021): 13–19. http://dx.doi.org/10.5604/01.3001.0014.8331.

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The paper describes the results of metallographic, tribological, and microscopic tests of wire connectors. It was shown that the structure and thickness of the tin layer on the copper element varies greatly. The paper describes the results of tribological investigations for electrical connectors in the initial state and covered with a layer of oxides formed as a result of corrosion. The results of tribological tests have shown a great influence of the oxide layer on friction and wear of tin coatings. The results of friction factor measurements were confirmed by microscopic observations. The tests confirmed that the oxide layer reduces plastic deformation of the tin coating and limits its tribological wear. Due to the brittleness and low adhesion of the oxide layer, friction-induced chipping was observed.

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Descartes, S., A. Saulot, C. Godeau, S. Bondeux, C. Dayot i Y. Berthier. "Wheel flange/rail gauge corner contact lubrication: Tribological investigations". Wear 271, nr 1-2 (maj 2011): 54–61. http://dx.doi.org/10.1016/j.wear.2010.10.019.

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Cichomski, Michał. "Tribological investigations of perfluoroalkylsilanes monolayers deposited on titanium surface". Materials Chemistry and Physics 136, nr 2-3 (październik 2012): 498–504. http://dx.doi.org/10.1016/j.matchemphys.2012.07.017.

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Petrica, M., B. Duscher, T. Koch i V. M. Archodoulaki. "Tribological investigations on virgin and accelerated aged PE-UHMW". Tribology International 87 (lipiec 2015): 151–59. http://dx.doi.org/10.1016/j.triboint.2015.02.024.

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Wieczorek, J., B. Oleksiak, J. Łabaj, B. Węcki i M. Mańka. "Silver Matrix Composites - Structure and Properties". Archives of Metallurgy and Materials 61, nr 1 (1.03.2016): 323–28. http://dx.doi.org/10.1515/amm-2016-0060.

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Phase compositions of composite materials determine their performance as well as physical and mechanical properties. Depending on the type of applied matrix and the kind, amount and morphology of the matrix reinforcement, it is possible to shape the material properties so that they meet specific operational requirements. In the paper, results of investigations on silver alloy matrix composites reinforced with ceramic particles are presented. The investigations enabled evaluation of hardness, tribological and mechanical properties as well as the structure of produced materials. The matrix of composite material was an alloy of silver and aluminium, magnesium and silicon. As the reinforcing phase, 20-60 μm ceramic particles (SiC, SiO2, Al2O3 and Cs) were applied. The volume fraction of the reinforcing phase in the composites was 10%. The composites were produced using the liquid phase (casting) technology, followed by plastic work (the KOBO method). The mechanical and tribological properties were analysed for plastic work-subjected composites. The mechanical properties were assessed based on a static tensile and hardness tests. The tribological properties were investigated under dry sliding conditions. The analysis of results led to determination of effects of the composite production technology on their performance. Moreover, a relationship between the type of reinforcing phase and the mechanical and tribological properties was established.

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Sebestyén, T., Gábor Buza, F. Franek, János Takács, Zoltán Kálazi, A. Pauschitz i László S. Tóth. "Tribological Investigations of Parts Sintered and Coated by Laser Beam". Materials Science Forum 473-474 (styczeń 2005): 255–60. http://dx.doi.org/10.4028/www.scientific.net/msf.473-474.255.

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In this work we intend to investigate the surface properties of laser sintered and coated parts, by measurement of friction coefficient and wear rate. The main aim of this research is to justify laser sintered prototype tools for injection molding of fibre-reinforced polymers. For increase of wear resistance we used hard Co-based and Fe-based coatings on laser-sintered phosphorous bronze and unalloyed steel substrate. Short carbon- and glass-fibre-reinforced polymers were used as counter bodies. For the tribological laboratory model tests a pin-on-disk test rig was used. In case of coated parts – with higher wear resistance – we used a cylinder-on-cylinder tribometer. The tribological properties were determined at different load conditions. Our results show that the friction coefficient and wear resistance of laser treated surfaces are good. The coefficient of friction of coated specimens is slightly less, but the wear rate is significantly less.

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Wang, Hai, Annan Sun, Xiaowen Qi, Yu Dong i Bingli Fan. "Experimental and Analytical Investigations on Tribological Properties of PTFE/AP Composites". Polymers 13, nr 24 (8.12.2021): 4295. http://dx.doi.org/10.3390/polym13244295.

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The tribological properties of polytetrafluoroethylene (PTFE)/AP (poly(para-phenyleneterephthalamide) (PPTA) pulp) composites under different test conditions (load: 2N, 10N; frequency: 1 Hz, 4 Hz; amplitude: 2 mm, 8 mm) were holistically evaluated. PTFE/AP composites with different AP mass ratios of 3%, 6%, and 12% as a skeleton support material were prepared. The coefficient of friction (COF) and wear rate were determined on a ball-on-disk tribometer. Furthermore, the morphology, element composition, and chemical structure of the transfer membrane were analyzed accordingly. The relationships between load, frequency, amplitude, and tribological properties were further investigated. According to the wear mechanism, AP enables effective improvement in the stiffness and wear resistance, which is also conducive to the formation of transfer films.

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Dong, Zhao, Kang Yang i Feizhi Zhang. "Investigations on the mechanics and tribology of multilayer graphene nanosheet in TiAl aviation composites". Advances in Mechanical Engineering 13, nr 8 (sierpień 2021): 168781402110407. http://dx.doi.org/10.1177/16878140211040714.

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Requirements of low energy consumption and material-volume reduction in the aerospace industry have spurred improvements of mechanical and tribological behaviors of TiAl (TA) alloys. TA-graphene (TAG) has poorer mechanical properties (6.02 ± 0.42 GPa nano-hardness, 150 ± 12.32 GPa elasticity modulus, and 802 ± 21 MPa yield strength) than (6.25 ± 0.52 GPa nano-hardness, 159 ± 14.21 GPa elasticity modulus, and 850 ± 19 MPa yield strength) of TA-graphene-silver (TAGS). Multilayer graphene nanosheets were curled into small loops to resist the applied forces, and helped to improve the mechanical properties of the TAGS. Subsequently, the graphene nanosheets enhanced the tribological performances as observed by the ball-on-disk tribometer. The following factors were primarily responsible for more excellent tribological behaviors (approximately 0.27 friction coefficient, 2.82 × 10−4 mm3 N−1 m−1 wear rate) of TAGS than those of the TAG: intra-lamellar separation of graphene, graphene-enhanced capacity of wear scar, plastic deformation of silver, the excellent cooperation lubrication of graphene-silver, the low-hardness lubrication film on the grain-refined layer, the well-distributed film grain, and low grain orientation angles.

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Grün, Jeremias, Marco Gohs i Frank Bauer. "Multiscale Structural Mechanics of Rotary Shaft Seals: Numerical Studies and Visual Experiments". Lubricants 11, nr 6 (23.05.2023): 234. http://dx.doi.org/10.3390/lubricants11060234.

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Although rotary shaft seals have been used successfully in many industrial applications for decades, their tribological behavior is still not completely understood. In-depth knowledge of the structural mechanics is essential for the design and optimization of such sealing systems. High complexity results from the multiscale interactions in the tribological system rotary shaft seal. Large macroscopic deformations occur due to the hyperelastic material behavior of elastomers coupled with microscopic tangential distortions of the sealing edge surface in the contact area. This paper includes both numerical and experimental studies on the tribological behavior of rotary shaft seals. A multiscale finite element model provides the simulation of the macroscopic deformations and the microscopic displacements. A test rig equipped with a hollow glass shaft enables in situ visual contact analyses, qualitative determinations of pressure distributions and quantitative measurements of elastomer surface distortions. The optical phenomenon of frustrated total internal reflection enables qualitative evaluations of the pressure distribution. Particle image velocimetry (PIV) is employed to quantify the tangential distortions. The test rig enables the measurement of the friction torque with the same configuration. The results of the numerical and experimental investigations for the radial load, friction torque and tangential distortions are compared and discussed. This serves to validate the simulation methods and the correlation of the measured parameters. This finally results in a solid and validated basis for further tribological investigations of rotary shaft seals.

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Giemza, Bolesław, Marek Domański, Maciej Deliś i Dawid Kapica. "Tribological properties of 3D printed components". Journal of KONBiN 48, nr 1 (1.12.2018): 447–63. http://dx.doi.org/10.2478/jok-2018-0066.

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Abstract Additive manufacturing technology is developing in many industries, including aviation, automotive and others. 3D printing offers new possibilities in the field of designing and manufacturing of machines and devices’ components. The paper presents the results of tribological investigations of components produced in FDM printing technology. The authors presented the evaluation of sliding properties of the model friction couple – block on ring type – of available thermoplastic polymers and polymers’ composites under dry friction conditions. The authors assessed the influence of material type and printed structure on resistance to motion of prepared samples.

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Edacherian, Abhilash, Ali Algahtani i Vineet Tirth. "Investigations of the Tribological Performance of A390 Alloy Hybrid Aluminum Matrix Composite". Materials 11, nr 12 (12.12.2018): 2524. http://dx.doi.org/10.3390/ma11122524.

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Several challenges stand in the way of the production of metal matrix composites (MMCs) such as higher processing temperatures, particulate mixing, particulate–matrix interface bonding issues, and the ability to process into desired geometrical shapes. Although there are many studies showing composites with single particulate reinforcements, studies on composites with multiple reinforcing agents (hybrid composites) are found to be limited. Development of a hybrid particulate composite with optimized mechanical and tribological properties is very significant to suit modern engineering applications. In this study, Al–Si hypereutectic alloy (A390) was used as the matrix and silicon carbide (SiC), graphite (Gr), and molybdenum di-sulphide (MoS2) were used as particulates. Particulate volume (wt %) was varied and sample test castings were made using a squeeze casting process through a stir casting processing route. The evaluation of the mechanical testing indicates that the presence of both the hard phase (SiC) and the soft phase had distinct effect on the properties of the hybrid aluminum matrix composites (HAMCs). Composite samples were characterized to understand the performance and to meet the tribological applications. The 3D profilometry of the fractured surfaces revealed poor ductility and scanning electron microscopy fractography study indicated an intra-granular brittle fracture for HAMCs. Also, the dry sliding wear tests indicated that the newly developed HAMCs had better tribological performance compared to that of A390 alloy.

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Dold, Christian, Tobias Amann i Andreas Kailer. "Influence of electric potentials on friction of sliding contacts lubricated by an ionic liquid". Physical Chemistry Chemical Physics 17, nr 16 (2015): 10339–42. http://dx.doi.org/10.1039/c4cp05965d.

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Tribological investigations on the macroscopic scale revealed that friction can be influenced in situ by applying electric potentials, if electrically conductive fluid such as an ionic liquid is used as a lubricant.

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Lukaszkowicz, Krzysztof, Jozef Sondor, Agnieszka Paradecka, Mirosława Pawlyta, Bartosz Chmiela, Mieczysław Pancielejko, Bożena Szczucka-Lasota, Tomasz Węgrzyn i Tomasz Tański. "Structure and Tribological Properties of AlCrN + CrCN Coating". Coatings 10, nr 11 (11.11.2020): 1084. http://dx.doi.org/10.3390/coatings10111084.

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The paper presents results of the investigation of the AlCrN and AlCrN + CrCN coatings, deposited by arc evaporation method on the austenitic steel substrate. Topography studies performed with the use of AFM showed that the roughness value was 24 nm for AlCrN and 14 nm for CrCN. Chemical analysis carried out with energy dispersive X-rays spectroscopy confirmed the chemical composition of the coatings. Transmission electron microscopy (TEM) investigations showed a column structure of AlCrN and CrCN layers with a width in the range of 10–200 nm. Tribological properties analyzed using a scratch test and ball-on-disc method showed a good adhesion of the coatings to the substrate (LC2 is 40 and 46 N for AlCrN and AlCrN + CrCN, respectively) and its high wear resistance; the use of an additional CrCN layers caused a decrease in the friction coefficient by 19%. Structure modification of the AlCrN + CrCN coating system and the related improvement in its mechanical and tribological properties allowed increasing the lifetime of the coated elements. The original approach was to produce a dual-layer coating, consisting of an internal, hard AlCrN layer and an external layer of CrCN, providing good tribological properties, as well as an appropriate forming of the transition zone between the layers.

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Ozimina, Dariusz, Katarzyna Piotrowska, Monika Madej i Arkadiusz Granek. "THE INFLUENCE OF ION IMPLANTATION ON THE PROPERTIES OF Ti6Al4V TITANIUM ALLOY IN BIOTRIBOLOGICAL SYSTEMS". Tribologia 292, nr 4 (30.11.2020): 27–36. http://dx.doi.org/10.5604/01.3001.0014.5895.

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The article is devoted to the assessment of the geometrical structure of the surface as well as the mechanical and tribological properties of the surface layers obtained in the process of ion implantation. The titanium alloy Ti6Al4V used in biotribological systems was implanted with nitrogen and argon ions. Investigations of the geometrical structure of the surface before and after the tribological tests were carried out using confocal microscopy. The hardness of the tested materials was determined by the instrumental indentation method using a Vickers indenter. A nanotribometer was used for tribological tests. The tests were carried out in a reciprocating motion under conditions of technically dry friction and friction with the lubrication of Ringer's solution. SEM scanning microscopy was used to determine the width of the wear pattern and the wear mechanism. The conducted research showed that the hardness of the tested materials increased as a result of ion implantation. The tribological tests showed that the use of ion implantation improves the tribological properties, and the dominant wear mechanism was abrasive wear.

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Bhat, Avinash, i Ganesh Kakandikar. "Manufacture of silicon carbide reinforced aluminium 6061 metal matrix composites for enhanced sliding wear properties". Manufacturing Review 6 (2019): 24. http://dx.doi.org/10.1051/mfreview/2019021.

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Composite materials have the capability of being customised to provide specific mechanical and tribological properties. This paper presents the manufacture of a novel composite of Al6061 with 5% SiC (50 μm size) by the stir casting method. Experimental investigations of mechanical and tribological properties of SiC reinforced Al6061 are discussed. Investigations with a Rockwell hardness tester revealed that this composite had enhanced hardness. Wear characteristics were investigated for Al6061 and the novel composite Al6061 + SiC with a Pin on disc tribometer for a load range of 5N-200N and RPM varying from 200 to 1500. The effect of crucial parameters such as load and RPM on the wear of the novel composite were presented with sensitivity analysis. The results obtained are encouraging, showing the novel composite having a lower wear rate.

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Wu, Xiangyu, i Yanzhong Wang. "Experimental investigations of tribological performances of novel friction pair with different conical configurations". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, nr 8 (28.02.2019): 1245–55. http://dx.doi.org/10.1177/1350650119834424.

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Friction plate with conical configuration is a novel application in automatic transmission. In order to investigate the tribological performances of novel friction pair with different conical configurations, a series of tests are conducted by using a variable-speed friction test rig. The lubrication regime is evaluated by the friction coefficient curves under different loads. Test results of the friction coefficient under different rotating speeds are analyzed. The difference in the frictional behavior is analyzed for different conical friction pairs. The effects of the cone height and cone angle are evaluated under the same dimensions. Results show that changes in the conical configuration indeed influence the frictional behaviors of the friction specimens. Rational determination of the conical configuration is helpful to obtain good tribological performance.

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Ahmed Ramadan, Mohamed, Hassan A. Sabour i Eman EL-Shenawy. "Tribological Properties of 3D Printed Polymers: PCL, ABS, PLA and Co Polyester". Tribology in Industry 45, nr 1 (15.03.2023): 161–67. http://dx.doi.org/10.24874/ti.1410.11.22.02.

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3D printing is one of the most portentous technologies for the time being. Recently, 3D printing has progressed remarkably and is expected to proceed in numerous applications, such as automotive, medical, wind turbine, and aerospace applications. 3D printing technology opens the door to enhancing and optimizing several applications. Although of such advancement, there is still a lack of the tribological research investigations in this area. This work is devoted to studying the tribological properties of 3D printed polymers (ABS, PLA, Co-polyester, and PCL) for utilization in a wide range of applications, such as medical, automotive, and various tribological applications. The test specimens were printed using fused deposition modeling (FDM) technology. The tribological characteristics of 3D printed specimens were evaluated using a pin-on-disc tester. Vicker's hardness tester was used to determine the specimens' hardness. Scanning electron microscopy (SEM) with backscattering was used to examine the worn surfaces of samples. Based on the findings of the current investigation, it was discovered that 3D printing technology enhanced the bonding strength and wear resistance of the tested specimens. Furthermore, the 3D-printed polymers (ABS, PLA, Co-polyester, and PCL) produced varying friction coefficient (high and low) values at acceptable wear resistance making them suitable for a wide range of applications. The samples that were printed using PLA and co-polyester had the lowest coefficients of friction (0.3) while the samples that were printed using ABS and PCL had the greatest coefficients of friction (0.4) and (0.39) respectively.

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Venkatesh, R., C. Ramesh Kannan, S. Manivannan, M. Vivekanandan, J. Phani Krishna, Amine Mezni, Saiful Islam i S. Rajkumar. "Synthesis and Experimental Investigations of Tribological and Corrosion Performance of AZ61 Magnesium Alloy Hybrid Composites". Journal of Nanomaterials 2022 (2.05.2022): 1–12. http://dx.doi.org/10.1155/2022/6012518.

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Magnesium alloy is the light weight material compared to aluminium alloy, and it possesses high strength; these alloys are used to manufacturing of vehicle parts. Magnesium alloy has extreme mechanical and thermal properties, and it is applied to aerospace applications. This study planned to improve the tribological and corrosion resistance of AZ61 magnesium alloy with reinforcement of boron carbide (B4C) and zirconium dioxide (ZrO2). Magnesium alloy hybrid composites are fabricated through stir casting process. Tribological and corrosion performance are analyzed through Taguchi L27 Orthogonal Array. In the tribological analysis, four parameters are involved such as % of reinforcement (4%, 8%, and 12%), disc speed (1 m/s, 2 m/s, and 3 m/s), normal load (30 N, 40 N, and 50 N), and sliding distance (1300 m, 1500 m, and 1700 m). Similarly, in salt spry corrosion analysis, four parameters are influenced used such as % of reinforcement (4%, 8%, and 12%), pH (7, 8, and 9), temperature (30°C, 35°C, and 40°C), and hanging time (30 hrs, 40 hrs, and 50 hrs). From this analysis, percentage of reinforcement is highly influenced in wear test, and in corrosion test, temperature is extremely influenced.

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Hussain, Abrar, Vitali Podgursky, Dmitri Goljandin, Mart Viljus, Maksim Antonov, Andrei Bogatov i Illia Krasnou. "Tribological and Mechanical Properties Investigations of Post-Consumer Cotton Textiles". Solid State Phenomena 320 (30.06.2021): 97–102. http://dx.doi.org/10.4028/www.scientific.net/ssp.320.97.

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In this manuscript surface roughness, coefficient of friction (COF) and tensile properties of a post-consumer cotton fabric are evaluated. Fabric roughness, COF, effective tensile force and breaking force measured by optical profilometer, CETR tribometer and Instron tensile machine, respectively. The results proved that COF could rely on fabric pattern. Moreover, microscopically roughness influences on friction and tensile properties due to surface defects. It was found that increase in roughness of textile cotton relates to increase of number of random directional fibers. These fibers intensify friction and reduce tensile properties. The reduced values of tensile (140.49 N), breaking (123.23 N) and effective tensile force (251.43 N) of warp direction are greater than values of tensile (79.54 N), breaking (67.97 N) and effective tensile force (179.69 N) of weft direction. These effects can lower cutting performance of post-consumer textile.

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Nallasamy, P., N. Saravanakumar, Sumannth Nagendran, EM Suriya i D. Yashwant. "Tribological investigations on MoS2-based nanolubricant for machine tool slideways". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 229, nr 5 (20.10.2014): 559–67. http://dx.doi.org/10.1177/1350650114556394.

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BIELINSKI, DARIUSZ, KAZIMIERZ JANCZAK, TERESA JANCZAK i LUDOMIR SLUSARSKI. "Investigations of the tribological characteristics of elastomers and elastomer composition". Polimery 36, nr 10 (październik 1991): 380–83. http://dx.doi.org/10.14314/polimery.1991.380.

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