Gotowe bibliografie tematyczne / TRIBOLOGICAL INVESTIGATIONS

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Gotowa bibliografia na temat „TRIBOLOGICAL INVESTIGATIONS”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "TRIBOLOGICAL INVESTIGATIONS"

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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Rozprawy doktorskie na temat "TRIBOLOGICAL INVESTIGATIONS"

Algodi, Samer Jasim Mahmood. "Characterisation, modelling and tribological investigations of nano-structured TiC-based electrical discharge coatings". Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/55168/.

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Electrical discharge coating (EDC) is a surface modification process used to produce hard coatings from a sacrificial powder metallurgy (PM) tool electrode onto a target workpiece. However, the integrity of as-processed EDC surfaces, as reported on in literature, is generally poor, with limited understanding of the fundamental interactions between energy source and workpiece material, and the microstructural development of the surfaces created. This thesis explores, at the nano-scale, the deposition and microstructural development of ED processed cermet coatings. Emphasis is given to TiC-based ED coatings, prepared using a semi-sintered TiC tool electrode. A comprehensive study of TiC/Fe cermet coating microstructural development, as a function of ED processing conditions (current 2 - 19 A; pulse-on time 2 - 64 μs) is presented, using the combined characterisation techniques of scanning electron microscopy (SEM) / energy dispersive X-ray spectroscopy (EDS), X-ray diffractometry (XRD) and cross-sectional transmission electron microscopy (TEM). The ED coatings were composites in nature, with complex banded nanostructures of TiC grains within an Fe matrix. Preferred TiC/Fe ED coatings on 304-SS, achieved under conditions of low processing energy (10 A current and 8 μs pulse-on time), exhibited low levels of cracks and porosity, with hardness values of ~ 1800 HV. The fraction of energy transferred to the workpiece, Fv, as a consequence of ED sparking, is an important parameter which affects directly individual crater geometry and the microstructural development of the near surface modified layer. Hence, a 2D transient heat transfer model is presented, using finite difference methods, and used to estimate effective values for Fv as a function of processing conditions, and thereby to predict coating layer thicknesses of developed microstructures through appropriate consideration of heat flow into the system. The model is validated against previous work in literature and with experimental observations. The modelling demonstrated a variation of energy transferred to the workpiece, of 17 - 23% for increasing current from 2 - 19 A at fixed pulse-on time of 8 μs; and 7 - 53% for increasing pulse-on time from 2 - 64 μs at fixed current of 10 A. Predictions for heat transfer and the cooling of melt pools, arising from single spark events, compared well with experimental observations for the development of these TiC/Fe cermet microstructures. The cooling phase had two distinct stages, with initial rapid non-uniform cooling within the first ~ 10 - 20 μs leading up to the onset of TiC crystallisation, followed by a more uniform stage of heat loss up to ~ 100 μs, leading up to the onset of Fe matrix solidification. The tribological behaviours of TiC/Fe ED cermet coatings on both HSS and 304-SS substrates were investigated, with reference Cu EDM surfaces. The wear resistance of these cermet coatings, on both substrate types, yielded dry sliding wear resistances up to two orders of magnitude greater than that of the substrate. Further, EDC cermet coatings on HSS were typically 2 - 4 times more wear resistant, depending on loading, than those deposited on 304-SS, with wear performances reflecting the composite nature of the coatings coupled with the mechanical properties of the substrates. Laser surface treatments, used to improve the surface integrity of the as-deposited coatings, through the elimination of cracks and porosity, acted to increase the wear rate for all samples, with the exception of coatings on HSS under conditions of high loading. The general increase in wear rate was attributed to a significant reduction in the proportion of TiC within the ED coatings, after laser treatment, combined with an increase in grain size; whilst improvements to the wear performance of laser treated, cermet coated HSS, under high loading, was attributed to the avoidance of an abrasive wear mechanism.

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Fu, Xi-Yong. "Tribological characteristics of metallic glass in sliding contact : experimental investigations and molecular dynamics simulations /". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu148820427653207.

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Holzer, Achill, Stephan Koß, Gunnar Matthiesen, Daniel Merget, Stephan Ziegler, Johannes Henrich Schleifenbaum i Katharina Schmitz. "Tribological investigations on additively manufactured surfaces using extreme high-speed laser material deposition (ehla) and laser powder bed fusion (LPBF)". Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71080.

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Today's economic and ecological directives demand for highly sustainable machine parts by low production cost and energy consumption. Consequently, it is crucial to guarantee a long service life by protecting all components against wear and corrosion. However, hydraulic components always include stressed surfaces, which suffer from heavy loads at high relative speeds. To prevent fretting, coating processes like thermal spraying or hard chrome have a long history in the field of hydraulics. New additive laser-based processes like EHLA and LPBF offer the potential to apply new coatings without environmentally hazardous substances such as chromium or to manufacture complex parts with new functionalities. So far, additively manufactured surfaces with relative movements are post-processed to obtain surface qualities similar to subtractive methods, as the tribological properties of additive surfaces have not been investigated to date. Therefore, this paper investigates the frictional behavior of 316L surfaces produced by laser-based EHLA and LPBF processes using a disc-disc tribometer.

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Bansal, Dinesh Gur Parshad. "Tribological investigation of electrical contacts". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31749.

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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2010.
Committee Chair: Streator, Jeffrey; Committee Member: Blanchet, Thierry; Committee Member: Cowan, Richard; Committee Member: Danyluk, Steven; Committee Member: Neu, Richard; Committee Member: Thadhani, Naresh. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Stone, D’Arcy S. "Silver Tantalate: a High Temperature Tribological Investigation". Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc700025/.

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As technology advances, mechanical and electrical systems are subjugated to intense temperature fluctuations through their service life. Designing coatings that operate in extreme temperatures is, therefore, a continuing challenge within the tribology community. Silver tantalate was chosen for investigation at the atomic level, the physical and chemical properties that influence the thermal, mechanical, and tribological behavior for moving assemblies in high temperature tribological applications. By correlating behavior of internal physical processes to the macro tribological behavior, the tribological community will potentially gain improved predicative performance of solid lubricants in future investigations. Three different approaches were explored for the creation of such materials on Inconel substrates: (1) powders produced using a solid state which were burnished on the surface; (2) monolithic silver tantalate thin films deposited by magnetron sputtering; and, (3) an adaptive tantalum nitride/silver nanocomposite sputter-deposited coating that forms a lubricious silver tantalate oxide on its surface when operated at elevated temperatures. Dry sliding wear tests of the coatings against Si3N4 counterfaces revealed friction coefficients in the 0.06 - 0.15 range at T ~ 750 °C. Reduced friction coefficients were found in nanocomposite materials that contained primarily a AgTaO3 phase with a small amount of segregated Ag phase, as suggested by structural characterization using X-ray diffraction. The presence of nanoparticles of segregated Ag in the thin films further enhanced the performance of these materials by increasing their toughness. Additional characterization of the AgTaO3 films at 750 °C under normal loads of 1, 2, 5, or 10 N revealed that the friction monotonically increased as the load was increased. These results were complemented by molecular dynamics simulations, which confirmed the increase of friction with load. Further, the simulations support the hypothesis that this trend can be explained in terms of decreased presence of Ag clusters near the sliding surface and the associated decreased porosity. The results suggest that the relative amount of Ag in a TaN or Ta2O5 mastrix may be used to tune film performance for a given application.

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Wang, Zhongnan. "Tribological investigation for next-generation polymeric micro-systems". Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/91016/.

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The development of micro-fabrication processes for 3D microstructures has led to the production of low-cost, low-energy devices at millimeter scales known as MEMS for a wide range of electronic, mechanical, mechatronic and biomedical applications. As surface-to-volume ratio increases drastically with decreasing dimension, surface properties of the materials are the prominent factor at the interface between two solids and consequent tribological issues such as adhesion, friction and wear will arise in MEMS devices when surfaces are in, or have the potential for, sliding contact. Measurement techniques and principles used in micro-tribology are quite different from those in macro-tribology. Various specialized micro-tribometers have attracted recent attention in attempts to obtain consistent, accurate tribological measurements that could provide information for the design of MEMS components. However, even these have operational parameters quite different to those in the regime typical of MEMS devices. For example, the thermal properties of polymers might mean that they are especially sensitivity to the speeds and reciprocating scan frequencies of measurements. This is a serious concern because the selection of appropriate materials for such applications is very important in order to reduce not only friction and wear, but also the stiction of the parts. The immediate challenge is that there is very little reliable information about the properties of this new generation of engineering materials because of insufficient understanding and characterization of their behaviour at the microscale under a wide range of experimental conditions. With these points in mind, this thesis aims to prompt wide study of the micro-tribological properties of polymers for MEMS applications, providing preliminary new data on them while exploring in some detail possible uncertainty effects that could arise from the testing regimes of most micro-tribometers. It starts by re-commissioning and characterizing a unique, wide-bandwidth prototype micro-tribometer developed at Warwick, establishing good operating procedures by comparing measurements on materials widely discussed in the literature. New data has been collected on an acrylate resin typically used for micro-stereo-lithography, PTFE and oxide-coated silicon. It suggests that deviations from Amonton’s law in the ten millinewton range might be less severe than previously reported. Observing that the skill and time required for such testing makes it unattractive for a production control environment, the thesis then explores, via contact modelling, whether there is a useful correlation between Berkovich tip nano-hardness and the micro-friction of the polymeric samples: several plausible modelling assumptions are shown to lead to inconsistencies. Final discussions and recommendations consider how to move on from these experimental scoping studies to acquire detailed evaluations of the properties of the best candidates under typical usage conditions prior to designers of potential products taking these materials and processes at all seriously.

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Micklos, Brian. "Wear mapping and tribological investigation of liquidmetal bulk metallic glass". [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000953.

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Dearn, Karl David. "An investigation into tribological and performance related aspects polymeric gearing". Thesis, University of Birmingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532276.

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The benefits of using polymer and polymer composite gears are numerous and it is these in part that is fuelling the resurgent commercial interest in them for metal replacement applications, thought to be in the region of £160M per annum. This interest is further driven by the increasingly important need for considerate energy consumption and the drive for greater product efficiency. As the science and technology associated with polymeric gearing develops, so too do the complexities and demands of the application. Although traditionally employed in low load and speed applications and motion control, such advancements are pushing the limits of high performance polymer applications to unprecedented levels where hitherto high temperature and corrosive environments would have excluded them. Thus, the complex kinematics of gearing and the extreme environments in which polymer gears operate make such applications ideal candidates for material manufacturers to demonstrate the superiority of their proprietary polymers. Despite this resurgent interest, polymer gears have received only a fraction of the attention received by their metal counterparts. As a result, those choosing to specify polymers in demanding applications are faced with a lack of reliable design and testing data, with current standards and guidelines based on metallic dogma. Given the fundamental differences between the two materials, this has been proved to be inadequate. This thesis aimed to address a variety of performance aspects of polymeric gears, particularly focusing on temperature and tribological related effects. At its foundation was the previous research conducted by the Power Transmission Laboratory, at the University of Birmingham. Five research areas were covered, they were: - The analysis and estimation of bulk temperatures in polymer spur gears - Contact analysis of polymeric gears - Acoustic emissions and transmission error analysis: - External lubrication analysis with respect to measured efficiencies and surface damage: -A design and rating algorithm for polymeric gears: The research utilised empirical, numerical and analytical techniques to improve the understanding of the behaviour of polymeric gears, such that their performance and reliability could be improved. In addition to this, recommendations were given for future research directions.

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Bhuyan, Satyam Kumar. "Investigation of tribological properties of biobased polymers and polymeric composites". [Ames, Iowa : Iowa State University], 2008.

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McCann, Laura. "Tribological investigation of articular cartilage substitution in the medial compartmental knee". Thesis, University of Leeds, 2009. http://etheses.whiterose.ac.uk/12736/.

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In the development of any cartilage substitution device, an understanding of the tribological response of the natural joint, as well as the treated joint is of upmost importance. Many previous studies have investigated the tribology of potential cartilage substitution therapies, using small scale pin on plate experiments. The aim of the current study was to develop an anatomical and physiological simulation of the medial compartmental bovine knee joint and to use this simulation to investigate a number of cartilage substitution therapies for damaged or diseased knee joints. A pendulum friction simulator was used to apply physiological loading and motion to medial compartmental knees. The wear of the cartilage was characterised following the experiments using three different techniques: surface topography analysis, volumetric wear quantification using µMRI scans and histological assessment. Three main interventions were investigated using this novel anatomical simulation - the tribological response of meniscectomy, the effect of conformity of tibial hemiarthroplasty designs, and finally, a number of potential cartilage substitution materials were investigated as osteochondral repair devices in the femoral condyle. In the first two studies, the removal of the meniscus and a decrease of tibial hemiarthroplasty conformity, resulted in an elevation of the coefficient of friction, contact stress, friction shear stress and subsequently the wear and degradation of cartilage. In the defect repair study, biphasic defect repair materials (hydrogels) had a superior tribological performance to non-compliant single phase materials (stainless steel). Across the three studies, the use of non-biphasic materials and/or the loss of joint congruity resulted in a more rapid decrease of cartilage interstitial fluid pressurisation and biphasic fluid load support, resulting in increased cartilage solid-solid contact and increased wear. This tribological simulation can be used to investigate many potential knee joint intervention, from uni- or hemi-arthroplasty, cartilage defect repair, meniscus substitutes or tissue engineered substitutes. This simulation can be used to further our understanding of the tribological characteristics of more satisfactory and conservative therapies for damaged and diseased synovial joints.

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Części książek na temat "TRIBOLOGICAL INVESTIGATIONS"

Goyal, Vipin, Pankaj Kumar, Pradyumn Kumar Arya, Dan Sathiaraj i Girish Verma. "A Review on Tribological Investigations for Automotive Applications". W Industrial Tribology, 229–45. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003243205-11.

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Sharma, Neha, Sayed Khadija Bari, Ponnekanti Nagendramma, Gananath D. Thakre i Anjan Ray. "Tribological Investigations of Sustainable Bio-Based Lubricants for Industrial Applications". W Green Tribology, 71–98. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003139386-3.

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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". W Materials Science, Testing and Informatics II, 255–60. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-957-1.255.

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Fleischer, G., H. D. Grohmann i D. Weinhauer. "Tribological Investigations of Crack Development on the Rail on an energetical basis". W Rail Quality and Maintenance for Modern Railway Operation, 407–24. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-015-8151-6_33.

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Tolazzi, Massimo, M. Meiler i Marion Merklein. "Tribological Investigations on Coated Steel Sheets Using the Dry Film Lubricant Drylube E1". W Sheet Metal 2005, 565–72. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-972-5.565.

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Begum, Fathimunnisa, N. Ravi Kumar i V. Ramachandra Raju. "Experimental Investigations on the Tribological Properties of Jatropha Oil by the Addition of Graphite Nanoparticles". W Lecture Notes on Multidisciplinary Industrial Engineering, 645–57. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7643-6_53.

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Koncsik, Zsuzsanna, Mária Berkes Maros i László Kuzsella. "Tribological Investigation of Si3N4 Composites". W Friction, Wear and Wear Protection, 393–401. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch49.

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Ravikiran, S. L. Aravind, B. G. Chetan, Afnaan Ali Khan, Prashanth, H. Poornananda, K. S. Sathvik i K. Shriharsha. "Experimental Investigation of Tribological Characterization of Bio-Nanolubricants". W Advances in Sustainability Science and Technology, 1–11. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4189-6_1.

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Anand Kumar, S., Ravikumar Dumpala, K. Uday Venkat Kiran i R. Gnanamoorthy. "Investigation on Elevated Temperature Tribological Performance of Alloy 718". W Advances in Mechanical Engineering, 629–36. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3639-7_75.

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Tiwari, Sunil Kumar, Shashank Pal, Abhishek Sharma, Ankit Dasgotra i Jitendra Kumar Pandey. "Investigation of Tribological Properties of Stir Cast Hybrid Aluminum Composites". W Lecture Notes in Mechanical Engineering, 125–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3135-1_14.

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Streszczenia konferencji na temat "TRIBOLOGICAL INVESTIGATIONS"

Babic, Miroslav. "Tribological Properties of Ground Surfaces". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63791.

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This paper presents the results of tribometric investigations of ground surfaces machined with different combinations of grinding regime. Though they belong to the same class of surface roughness, they show significant differences in tribological properties. This is a consequence of differences in the state of material in the surface layers, which arise from the machining regime parameters variation. These results emphasize the essential importance of correct definition of tribological criteria for contact surface states in the design phase.

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Karpuschewski, B., i F. Welzel. "Tribological Conditioning of Cylinder Running Surfaces". W ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7237.

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In the wake of increasing performance requirements for internal combustion engines, regarding downsizing, and rising mobility, efficient manufacturing processes are gaining significance in Far Eastern markets. Also in consideration of increasing emission limits for these combustion engines, investigations regarding alternative technologies for the efficient manufacturing of performance-optimized cylinder running surfaces were carried out by the Institute of Manufacturing Technology and Quality Management. The microstructure of these surfaces and the subsequent surface integrity are in the focus of considerations. Using tribological analysis of the mechanical running-in behavior of cylinder running surfaces, conclusions will be drawn on the impact of the last honing step of the engine production. These investigations are carried out in terms of a possible conditioning of tribotechnical systems in their production and the concomitant reduction of friction and wear-intensive running-in processes. In this regard alternative finishing operations like burnishing are investigated.

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Teller, Marco, Stephan Prünte, Ingo Ross, André Temmler, Jochen M. Schneider i Gerhard Hirt. "Tribological investigations of the applicability of surface functionalization for dry extrusion processes". W PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience. Author(s), 2017. http://dx.doi.org/10.1063/1.5008157.

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Löbel, M., T. Lindner, T. Lampke i C. Kohrt. "Development of Wear-Resistant High-Entropy Alloy Coatings Produced by Thermal Spray Technology". W ITSC2017, redaktorzy A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen i C. A. Widener. DVS Media GmbH, 2017. http://dx.doi.org/10.31399/asm.cp.itsc2017p0200.

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Abstract The alloying concept of High-Entropy Alloys (HEA) has attracted much scientific interest due to an interesting combination of properties. Previous investigations have shown that high hardness and strength, comparable to bulk metallic glasses, can be achieved. Furthermore, HEAs show distinct ductility and good high-temperature resistance. First investigations on tribological properties are indicating high wear resistance. Previous investigations of the alloy system AlCoCrFeNiTi in bulk state have shown promising properties. Therefore, the alloy AlCoCrFeNiTi with equimolar composition was selected for transferring bulk properties to thermally sprayed coatings. The focus of this contribution is on studying tribological properties of thermally sprayed HEA coatings to enlarge the field of possible applications. Feedstock material production was carried out by high-energy ball milling (HEM) and inert gas atomization. Subsequently, coatings were deposited by Atmospheric Plasma Spray (APS). Tribological properties of the coatings under different wear regimes were investigated in ball-on-disk wear tests, oscillating wear tests and scratch tests. The tribological properties are compared with a conventional hard chrome plating and correlated with microstructure.

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Bach, F. W., K. Möhwald i B. Drößler. "Thermally Sprayed Coatings with Stochastic Microstructures for Thermomechanically High Stressed Surfaces". W ITSC2008, redaktorzy B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima i G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p0321.

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Abstract New requirements for modern component part surfaces increasingly demand improvements over friction coefficients in the sense of a reduction of friction losses. A substantial control factor in terms of lower friction and wear is the use of coating solutions such as thermal spray coatings. In practice, the application of coatings by means of thermal spray is more and more often used for influencing tribological matching. However, surface microstructuring might represent an additional, further reaching solution for wear and friction behaviour improvements of tribologically high-stressed surfaces. The aim of the reported research project is the development of atmospheric plasma sprayed (APS) coatings with an inherent porous microstructure and surfaces with stochastically distributed nap volumes (from cut pores) regarding lubricant retention and -distribution in running surfaces of friction-type bearings. Subject of these investigations are in particular thermomechanically highly loaded hydrodynamic tribological matchings, amongst others by the example of a piston ring/cylinder system in engine blocks. The use of special fractioned Fe-base powders enables the production of a new type of coatings with an inherent porous microstructure, which offer advantages due to constantly regenerating their surface topology under wear, and maintain employment in tribological systems with increased loads due to optimized lubricant retention and distribution. Hence, this project has an emphasis on the design of optimal nap sizes in coating surface structure in dependence on the hydrodynamical load, as well as on investigations for the controllability of nap volumes by the design of suitable processes.

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Andriusis, Albinas, Vytenis Jankauskas, Juozas Padgurskas, Raimundas Rukuiza i Audrius Zunda. "Investigation of Sliding Friction Pairs With Electro-Pulse Sprayed Micro-Coats". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63975.

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Electro-pulse spraying (EPS) is the coating technology of “electric explosion of conductive materials” when high-voltage and powerful impulse flows through a wire conductor. Object of our investigation — tribological properties of sliding pairs with copper micro-coats made by EPS after one time explosion. Small-grained dense structure coat with evaluated thickness about 4–6 ?m was obtained. Tribological tests, performed at marginal lubrication with multi-stage load, shows that using EPS-specimens the value of friction coefficient is lower as control version. At instantaneous setting of load for long-term running the copper films adopts well to the change of load. The wear of friction pairs according to worn mass show that EPS-specimens worn 79% less than CV-specimens. The investigations point out that copper micro-coats have better tribological properties comparing to control version of friction pairs.

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Suresh, Nitika, K. M. Shreehari, Akshay Prasad, Shivaram Kruthvik, R. Manu i K. Deepak Lawrence. "Simulation of surface topography of engineering surfaces with specified roughness for tribological investigations". W INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCES-MODELLING, COMPUTING AND SOFT COMPUTING (CSMCS 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0045851.

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Bunget, Cristina, Wesley A. Salandro i Laine Mears. "Tribological Aspects in Electrically-Assisted Forming". W ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34249.

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The constantly increasing economical and ecological concerns in the automotive and aerospace industries have resulted in high demand for improved fuel economy and greater vehicle performance. Lightweight construction is critical for reducing inertial and rolling resistance losses to increase the product performance while maintaining safety and functional requirements. This will open a wide variety of opportunities to implement materials with high strength-to-weight ratios, such as aluminum, magnesium, stainless steel and titanium alloys. However, when using conventional forming processes, these light materials bring about processing challenges: low formability, high yield strength and low strain hardening coefficients. Electrically-Assisted Forming (EAF) is a method of overcoming these limitations. Specifically, EAF is a novel forming process where electricity, AC or DC, is applied to the metallic workpiece through the dies during deformation. Previous experimental investigations have shown that EAF can lead to reductions in flow stress and power consumption, increase in formability through larger achievable strains, the ability to reduce/eliminate springback, and improved precision. This study investigates the influence of electricity on the different lubrication mechanisms by evaluating lubricant performance in an EAF process and identifying potential lubricant candidates for EAF. The tribological conditions have a significant influence on the frictional forces occurring at the die/workpiece interface, thus on the forming load, part quality, and achievable form. When electricity is applied, besides the changes due to surface expansion at the interface occurring in conventional processes, the lubricant is exposed to high localized temperatures and current fields. To analyze this, electrically-assisted ring compression tests are conducted and the performance characteristics of several lubricants are studied. By combining the experiments and finite element simulation results, friction coefficients can be estimated, and the effect of electric current flow on friction characteristics quantified. One goal of this study is to identify possible lubricant candidates to be used in EAF processes.

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Marinack, Martin C., Patrick S. M. Dougherty i C. Fred Higgs. "Single Particle Interaction Properties: Investigations on the Coefficient of Restitution and Coefficient of Friction". W ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61165.

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Understanding granular flows has always been important for predicting natural phenomena such as rockslides and soil erosion, as well as industrial processes such as coal-based fossil fuel systems and solids processing. As such, it becomes important to understand granular flows from both a classical granular flow and tribological perspective. Inherently important in the study of granular flows is the study of the individual particle level interactions, which define the global behavior of the flow. The current work examines both the coefficient of restitution (COR) and coefficient of friction (COF) for various material combinations. COR and tribological experiments are performed on various sphere and plate (disk) materials, such as low carbon steel, tungsten carbide (WC), and NITINOL 60.

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Żórawski, W., T. Burakowski i S. Skrzypek. "Tribological Properties of HVOF Sprayed Nanostructured Composite Coatings". W ITSC2011, redaktorzy B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima i A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0740.

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Abstract Nanostructured materials are of particular scientific interest because of their physical and mechanical properties, which are superior to those of conventional materials. They are more widely used in various industrial applications mainly due to decreasing production costs. The work is concerned with a study of the tribological properties of a HVOF sprayed composite of nanostructured WC12Co mixed with nanostructured Fe3O4, having the properties of solid lubricant. The coatings were sprayed by means of a Hybrid Diamond Jet system. A T-01 ball on disc tribological tester was used to study their resistance to wear and determine the coefficient of friction on the basis of friction force obtained in the course of continuous measurement at a set load. Result of investigations were compared with properties of coatings sprayed with standard WC12Co/ Fe3O4. The microstructures and compositions of the nanostructured powders and coatings were analyzed by scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray analysis. Their phase composition was studied using a Bruker D8 Advance diffractometer.

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Raporty organizacyjne na temat "TRIBOLOGICAL INVESTIGATIONS"

Perry, Scott S., i Nicholas Spencer. Fundamental Investigations of the Tribological Properties of Biological Interfaces. Fort Belvoir, VA: Defense Technical Information Center, październik 2005. http://dx.doi.org/10.21236/ada438326.

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Perry, Scott S. Fundamental Investigations of the Tribological Properties of Biological Interfaces. Fort Belvoir, VA: Defense Technical Information Center, listopad 2007. http://dx.doi.org/10.21236/ada480160.

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Tribological investigations of composites and other selected materials sliding against vacuum-deposited MoS* coatings. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4959.

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