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  • 101.
    Rosén, Bengt-Göran
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Nilsson, Bertil
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom R.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Wiklund, Daniel
    Chalmers University of Technology, Gothenburg, Sweden.
    Xiao, Li
    Chalmers University of Technology, Gothenburg, Sweden.
    Oil pockets and surface topography: Mechanisms of friction reduction2004Conference paper (Other academic)
    Abstract [en]

    Oil pockets reduce friction in two ways: by providing lift themselves by a cavitation mechanism, and also by acting as a reservoir of lubricant which will leak out around their boundaries to minimise direct metallic contact in the surrounding region. The relative importance of these mechanisms is estimated in particular tribological environments. The general cavitation conditions for oil pockets are defined and the cavitation models of Etsion and Kato are compared. Both these models require knowledge of the size and distribution of oil pockets, and an attempt is made to relate these to measurable surface topography parameters. Mechanisms for leakage of lubricant from oil pockets are also discussed. Advantages and disadvantages of the Wihiborg-Crafoord index are presented. The effect of oil pockets on the contact regime in gears is assessed, and in particular the likely effect of oil-pocket-induced cavitation on gear noise, and its relation to existing work on gear roughness, is discussed. Problems of oil pocket measurement on reaÌ surfaces are outlined and the advantages of 3D measurement are identified.

  • 102.
    Rosén, Bengt-Göran
    et al.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Wennerberg, Ann
    Malmö Högskola, Odontologiska fakulteten.
    Jimbo, Ryo
    Malmö Högskola, Odontologiska fakulteten.
    Fractal (scale sensitive) characterisation of dental implant morfology2012Conference paper (Other academic)
  • 103.
    Rosén, Stefan
    et al.
    Toponova AB, Halmstad, Sweden.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces. Manufacturing Technology Research Group, Department of Materials and Manufacturing Technology, Chalmers University, Göteborg, Sweden.
    The Stedman diagram revisited2014In: Surface Topography : Metrology and Properties, ISSN 2051-672X, Vol. 2, no 1, article id 014005Article in journal (Refereed)
    Abstract [en]

    The Stedman diagram has been used for some years to display aspects of the performance of instruments measuring surface roughness. Such diagrams are herein employed to compare the features of a range of proprietary measuring instruments, including contact and non-contact devices. An extension of the basic diagram is proposed, which would allow it to include a further aspect: the speed of data collection. Figures of merit based on the revised diagram are computed, which enable instruments to be ranked on these particular aspects of their performance. Contact instruments emerge as comparable to non-contact, as their slower rate of data acquisition can be offset by the greater area they can access in amplitude–wavelength space. © 2014 IOP Publishing Ltd.

  • 104.
    Rosén, Stefan
    et al.
    Toponova AB, Halmstad, Sweden.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces. Chalmers University, Göteborg, Sweden.
    The Stedman diagram revisited2013In: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, 2013, p. 201-206Conference paper (Refereed)
    Abstract [en]

    The Stedman diagram has been used for some years to display aspects of the performance of surface roughness measuring instruments. Such diagrams are herein employed to compare the features of a range of proprietary measuring instruments, including contact and non-contact devices. An extension of the basic diagram is proposed which would allow it to include a further aspect, speed of data collection. Figures of merit based on the revised diagram are computed which enable instruments to be ranked on these particular aspects of their performance. Contact instruments emerge as comparable to non-contact, as their slower rate of data acquisition can be offset by the greater area they can access in amplitude-wavelength space.

  • 105.
    Speich, M.
    et al.
    University Aalen, Aalen, Germany.
    Bååth, Lars
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Fotonik.
    Boerret, R.
    University Aalen, Aalen, Germany.
    Harrison, D.K.
    Glasgow Caledonian University, Glasgow, United Kingdom.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Robot assisted steel polishing and surface characterisation2012In: Proceedings of the 12th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2012 / [ed] Spaan H., Burke T. & Shore P., Cranfield, Bedfordshire: euspen , 2012, Vol. 2, p. 205-208Conference paper (Refereed)
    Abstract [en]

    Polymer optics is a growing market both for medium quality optics and precision optics. Steel moulds for polymer optics are normally produced in several process steps; the last step before moulding is manual polishing. This step requires skilled experts and is very time-consuming. The focus of this paper is on robot polishing of steel moulds for polymer injection moulding of optics. The goal of this work is to replace manual polishing and other process steps with robot polishing. Therefore a new process has been developed to minimize the number of required process steps.

    Steel moulds for polymer optics demand high standards of roughness and shape accuracy. To reach the required specifications concerning roughness and shape accuracy different measurement and characterization methods are necessary. A combination of parameters determined with different measurement instruments is needed to validate the polishing results.

    This project was started by Aalen University and UVEX Safety Group together with the Experimental Ophthalmology Group Homburg/Saar. The goal for this new process is to produce a ready to use steel mould with a shape accuracy better than 4µm and a micro roughness of less than 5nm rms; with just one process step after grinding.

  • 106.
    Thomas, T. R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Zahouani, Hassan
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Blunt, Liam
    Huddesfield University, UK.
    El Mansori, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Traceology, quantifying finishing machining and function: A tool and wear mark characterisation study2009In: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszow, Poland: Rzeszow University of Technology , 2009, p. 209-215Conference paper (Refereed)
    Abstract [en]

    Traceology is defined as the study of wearmarks and its history in criminology and archaeology is briefly described. It is proposed that the concept of traceology can be extended to machined surfaces, particularly those produced by abrasive techniques. A taxonomy of wearmarks is outlined which would encompass both pits and scratches. Taxonomic implementations such as the morphology rose and the morphological tree are introduced. The general principles of traceology are illustrated by case studies from criminology, archaeology and abrasive machining processes.

  • 107.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Engineering applications of surface topography2013In: International Journal of Precision Technology, ISSN 1755-2079, Vol. 3, no 4, p. 333-353Article in journal (Refereed)
    Abstract [en]

    A taxonomy of applications is developed using the concept of function maps. The importance of roughness in contact mechanics is emphasised and alternative models of the plasticity index are revisited. The concept of contact resistance is shown to be strongly dependent on roughness. Further discussions are illustrated by a selection of case studies. Case studies from the life sciences include a discussion of dental and femoral prosthetics and architectural haptics. Tribological case studies are based on automotive problems, including manufacture of body parts, cylinder bore friction and lubrication, rocker cam wear and gear lubrication. It is concluded that the future of roughness studies lies with applications; that only a small number of currently available roughness parameters appear to have any practical use; and that much current work may eventually made obsolete by the increasing development of structured surfaces.

  • 108.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Roughness and function2013In: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, Taipei, Taiwan, 2013Conference paper (Refereed)
    Abstract [en]

    A function map is used to locate applications of roughness in separation-velocity space. The importance of roughness in contact mechanics is demonstrated and versions of the plasticity index are introduced and compared. Case studies of roughness and function are presented from tribology and the life sciences. Tribological examples are taken from the automotive industry and include the manufacture of vehicle bodies, and drive train tribology, particularly cylinder liner, cam and gearbox friction and wear. From the life sciences, problems of prosthetic fixation and tribology are shown to depend on roughness. The interaction of haptics and surface finish is described and illustrated. A number of other areas of application are listed. Finally the likely future importance of structured surfaces is discussed.

  • 109.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Roughness and function2014In: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 2, no 1, article id 014001Article in journal (Refereed)
    Abstract [en]

    A function map is used to locate applications of roughness in separation-velocity space. The importance of roughness in contact mechanics is demonstrated and versions of the plasticity index are introduced and compared. Case studies of roughness and function are presented from tribology and the life sciences. Tribological examples are taken from the automotive industry and include the manufacture of vehicle bodies, and drive train tribology, particularly cylinder liner, cam and gearbox friction and wear. From the life sciences, problems of prosthetic fixation and tribology are shown to depend on roughness. The interaction of haptics and surface finish is described and illustrated. A number of other areas of application are listed. Finally the likely future importance of structured surfaces is discussed. © 2014 IOP Publishing Ltd.

  • 110.
    Thomas, Tom
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Using stylus Instruments to Solve Engineering Roughness Problems2009Conference paper (Refereed)
    Abstract [en]

    Performance of roughness measuring instruments is best compared by using Stedman diagrams. These make clear why the majority of roughness measurements for inspection and quality control in engineering industry are still made with stylus instruments. The design and construction of these instruments is described and compared with their predecessors, and their advantages, limitations and sources of error are discussed. The use of computers with modern stylus instruments raises problems of signal conditioning such as analogue-to-digital conversion and form and waviness removal. The former requires control of quantisation and aliasing, while the latter needs the design and implementation of specialised filters such as the robust Gaussian and valley removal filters. Characterisation of profile measurements includes both amplitude and texture parameters; functions such as probability distributions, autocorrelation functions and power spectra are also sometimes used, but their drawbacks need to be realised.  Special amplitude parameters have been developed to describe the multiprocess surfaces now in common use. Roughness parameter specification in standards raises questions of sampling robustness. Applications are illustrated by case histories from fluid dynamics, heat transfer and automotive engineering.

  • 111.
    Thomas, Tom R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt - Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Zahouani, Hassan
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Blunt, Liam
    Centre for Precision Technologies, Huddersfield University, Huddersfield, UK.
    El Mansori, Mohamed
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Traceology, quantifying finishing machining and function: A tool and wear mark characterisation study2011In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 271, no 3-4, p. 553-558Article in journal (Refereed)
    Abstract [en]

    Traceology is defined as the study of wear marks and its history in criminology and archaeology is briefly described. It is proposed that the concept of traceology can be extended to machined surfaces, particularly those produced by abrasive techniques. A taxonomy of wear marks is outlined which would encompass both pits and scratches. Taxonomic implementations such as the morphology rose and the morphological tree are introduced. The general principles of traceology are illustrated by case studies from criminology, archaeology and abrasive machining processes.

  • 112.
    Thomas, Tom
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Implementation of Whitehouse's method for calculating properties of self-affine fractal profiles2008In: Proceedings of the Institution of mechanical engineers. Part C, journal of mechanical engineering science, ISSN 0954-4062, E-ISSN 2041-2983, Vol. 222, no 8, p. 1547-1550Article in journal (Refereed)
    Abstract [en]

    Many software packages for roughness analysis offer the possibility of calculating the fractal dimension D of surface profiles by techniques, which assume them to be self-similar and therefore uniquely defined by D. However, fractal profiles are not self-similar but self-affine, so that two profiles of quite different roughnesses may share the same fractal dimension. To distinguish between them requires the calculation of an additional scaling factor, the so-called topothesy Λ. Traditionally, D and Λ are derived laboriously from the slope and intercept of the profile's structure function. A quicker and more convenient derivation from standard roughness parameters has been suggested by Whitehouse. Based on this derivation, it is here shown that D and Λ depend on two dimensionless numbers: the ratio of the mean peak spacing to the rms roughness and the ratio of the mean local peak spacing to the sampling interval. Using this approach, values of D and Λ are calculated from the measurements on surface profiles produced by polishing, plateau honing, and various single-point machining processes. Different processes are shown to occupy different regions in D-Λ space, and polisbed surfaces show a relationship between D and Λ, which is independent of the surface material. © IMechE 2008.

  • 113.
    Thomas, T.R.
    et al.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Surfaces generated by abrasive finishing processes as self-affine fractals2009In: International Journal of Surface Science and Engineering, ISSN 1749-785X, Vol. 3, no 4, p. 275-285Article in journal (Other academic)
    Abstract [en]

    Self-affine fractals offer a tool for characterising surface roughness. Fractal parameters are scale-invariant and can be derived from the Structure Function (SF): if computation of the SF is not practicable then parameters can be derived from roughness parameters available on many commercial software packages. The three-dimensional SF gives information about anisotropy. SFs can offer a demonstration of the effect of wear on surface topography in tribological investigations. Finally the SF can be used with material properties to obtain a low-pass cutoff for the calculation of surface data for use in rough contact mechanics.

  • 114.
    Wang, Hongjun
    et al.
    Beijing Information Science & Technology University, Beijing, China.
    Xu, Xiaoli
    Beijing Information Science & Technology University, Beijing, China.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Fault diagnosis model based on multi-manifold learning and PSO-SVM for machinery2014In: Chinese Journal of Scientific Instrument, ISSN 0254-3087, Vol. 35, no 12, p. 210-214, article id 210Article in journal (Refereed)
    Abstract [en]

    Fault diagnosis technology plays an important role in the industries due to the emergency fault of a machine could bring the heavy lost for the people and the company. A fault diagnosis model based on multi-manifold learning and particle swarm optimization support vector machine(PSO-SVM) is studied. This fault diagnosis model is used for a rolling bearing experimental of three kinds faults. The results are verified that this model based on multi-manifold learning and PSO-SVM is good at the fault sensitive features acquisition with effective accuracy.

  • 115.
    Wennerberg, Ann
    et al.
    Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Albrektsson, Tomas
    Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
    Surface Topography and Measuring Techniques for Dental Implant Applications – Possibilities and obstacles2012In: Implant Dentistry Research Guide: Basic, Translational and Clinical Research / [ed] Ahmed Ballo, New York, NY: Nova Science Publishers, Inc., 2012, p. 33-50Chapter in book (Refereed)
    Abstract [en]

    Surface topography has long been identified as a crucial parameter for successful osseointegration of oral implants. A paradigm shift occurred during the 1990s, when the huge majority of companies abandoned turned, minimally rough surfaces in favour of moderately rough surfaces. Several machining techniques have been used to increase the roughness from what was achieved with a turning process. An early obstacle was topographical description of surfaces; scanning electron microscopy (SEM) was often used as a description of the surfaces, but this technique provided no quantitative data. Thus it was, in many cases, difficult to know how one surface differed from another. Optical methods were developed during the late 1980s, and then it was possible to evaluate the threaded part of the implants relevant for osseointegration. Currently, general guidelines exist for how to measure implants surfaces, and a set of quantitative parameters have, after extensive research, been recommended for the topographical evaluation. However, the implant surfaces of today are often geometrically complex and include nanometer particles, porosity, coatings and deterministic patterning; thus the demands for new measuring techniques and evaluation methods increase. © 2012 by Nova Science Publishers, Inc. All rights reserved.

  • 116.
    Wihlborg, Anders
    et al.
    Epsilon Development AB, Gothenburg, Sweden.
    Wiklund, Daniel
    Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The Influence of Lubricants Kinematic Viscosity and Steel Sheet Surface-Topography in a Bending Under Tension Friction Test2001In: Tribology 2001 - scientific achievements, industrial applications, future challenges: plenary and session key papers from the 2nd World Tribology Congress ; Vienna, Austria, 3-7 September 2001 / [ed] F. Franek, W.J. Bartz, A. Pauschitz, Wien: Österreichische Tribologische Gesellschaft , 2001Conference paper (Refereed)
  • 117.
    Wiklund, Daniel
    et al.
    Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola.
    Nilsson, Larsgunnar
    Nilsson, Bertil
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
    Andersson, Alf
    Rosén, Bengt Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Gunnarsson, Lars
    On the Implementation and Evaluation of a Roughness Based Friction Model in FE Simulations of Sheet Metal Forming2006In: Proceedings of The 12th Nordic Symposium on Tribology, Lyngby: DTU Mechanical Engineering , 2006Conference paper (Refereed)
  • 118.
    Wiklund, Daniel
    et al.
    Chalmers University of Technology.
    Wihlborg, Anders
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Evaluation of surface topography parameters for friction prediction in stamping2004In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1296-1300Article in journal (Refereed)
    Abstract [en]

    The continued globalisation of the automotive industry, leading to increasing demands for competitiveness and escalating legislative requirements, is the main driving force of research activities of steel sheet surfaces. Recent studies on the stamping process have been carried out among others within AUTOsurf, a project funded by the European Community, and by Wihlborg and Crafoord. The purpose of this study was to evaluate the viability of the proposed parameters for friction prediction. Seventeen different surface topographies were investigated. The sheet materials were either, hot-dip galvanised, electrogalvanised or galvannealed, and electron beam or electric discharged textures. The frictional response was measured in a bending under tension (BUT) test under mixed lubricated conditions. This BUT test simulates the conditions of the die radius in a stamping tool. The laboratory test differs from the experimental work performed in AUTOsurf which simulated the conditions of the holding-down plate. In spite of the differences in test equipments in AUTOsurf, e.g. the rotational friction tester (RTF), on a comparison the correlation of frictional response was significant. But neither of the proposed parameters could predict the frictional response with sufficient accuracy in this study. In addition, the friction model in AUTOsurf describes peak lubrication as a dragging phenomenon on sliding surfaces. The movement eased friction in inverse proportion to the average peak area. However, the trend in this study showed the opposite, movement eased friction proportionally to the average peak area. The result indicates a switch of dominant friction mechanism when the sliding velocity is increased, i.e. from a dragging phenomenon at low velocities to micro-hydrodynamic wedge effects at high velocities.

  • 119.
    Wiklund, Daniel
    et al.
    Calmers University of Technology, Gothenburg, Sweden.
    Wihlborg, Anders
    Epsilon Development, Gothenburg, Sweden.
    Rosén, B.-G.
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    A Comparative Surface Topography Study of FEM Simulation and Surface Indentation Tests (SIT) on Friction Prediction in Steel Sheet Forming2003In: 10th Nordic Symposium on Tribology: NORDTRIB 2002, Stockholm: Kungliga Tekniska högskolan, 2003, p. 54-54Conference paper (Refereed)
  • 120.
    Xiao, L.
    et al.
    Chalmers University of Techonology, Göteborg.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Nilsson, P. H.
    Volvo Technology Corporation.
    Kalin, M.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Vižintin, J.
    Centre for Tribology & Technical Diagnostics, Slovenia.
    Rolling and rolling-to-sliding contact behaviour of DLC coatings2005In: Life cycle tribology: proceeding of the 31st Leeds-Lyon symposium on tribology held at Trinity and All Saints College, Horsforth, Leeds, UK, 7th-10th September 2004 / [ed] Dowson, D., Amsterdam: Elsevier, 2005, p. 213-220Conference paper (Refereed)
  • 121.
    Xiao, Li
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    An Experimental Study on the Effect of Surface Topography on Rough Friction in Gears2001In: Proceedings of the JSME International Conference on Motion and Power Transmissions: MPT2001-Fukuoka; November 15 - 17, 2001, Fukuoka, The Japan Society of Mechanical Engineers , 2001, Vol. 2, p. 547-552Conference paper (Other academic)
  • 122.
    Xiao, Li
    et al.
    Chalmers University of Technology, Production Engineering, Göteborg, Sweden.
    Björklund, Stefan
    KTH, Machine Design, Stockholm Sweden.
    Rosén, Bengt Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    The influence of surface roughness and the contact pressure distribution on friction in rolling/sliding contacts2007In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 40, no 4, p. 694-698Article in journal (Refereed)
    Abstract [en]

    A numerical contact model is used to study the influence of surface roughness and the pressure distribution on the frictional behaviour in rolling/sliding contacts. Double-crowned roller surfaces are measured and used as input for the contact analysis. The contact pressure distribution is calculated for dry static contacts and the results are compared with friction measurements in a lubricated rolling/sliding contact made with a rough friction test rig. The mean pressure is suggested as a parameter that can be used to predict the influence of surface roughness on the friction coefficient in such contacts. The results show two important properties of the friction coefficient for the friction regime studied in this paper: (1) there is a linear decrease in friction coefficient as a function of the slide-to-roll ratio, and (2) the friction coefficient increases linearly with increasing mean contact pressure up to a maximum limit above which the friction coefficient is constant. The absolute deviation of experimental results from the derived theory is for most cases within 0.005.

  • 123.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Surface lay effect on rough friction in roller contact2004In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 257, no 12, p. 1301-1307Article in journal (Refereed)
    Abstract [en]

    Surface lay describes the direction of the predominant surface pattern. A properly designed surface texture configuration has been recognised as a vital issue affecting lubrication and sliding in machinery applications in the literature. Gaining understanding of this tribological phenomenon is no doubt beneficial in facilitating the production of more efficient machine parts and thus reduces production cost. This paper describes an experimental method to investigate the effect of surface lay on lubricated rolling/sliding of ground roller surfaces. By using the rough friction test rig, different surface lay contacts can be simulated and the friction can be measured. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter [ηv/p]). Results show that an optimal contact lay angle that provides a minimum friction value is achievable through rig testing. The relative sliding speed direction has a symmetrical effect on friction at the same lay orientation; for sliding speed angles less than about 80, the larger the angle, the lower the friction, and vice versa. © 2004 Elsevier B.V. All rights reserved.

  • 124.
    Xiao, Li
    et al.
    Department of Production Engineering, Chalmers University of Technology, Gothenburg, Sweden.
    Rosén, Bengt-Göran
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Amini, Naser
    Volvo Car Corporation, Gothenburg, Sweden.
    Nilsson, Per H.
    Volvo Technological Development, Gothenburg, Sweden.
    A study on the effect of surface topography on rough friction in roller contact2003In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 254, no 11, p. 1162-1169Article in journal (Refereed)
    Abstract [en]

    The friction behaviour of gear teeth in the context of tribology can have a strong effect on housing vibration, noise and efficiency. One of the parameters that greatly influences the friction under certain running conditions is surface roughness. In this work, rough friction was studied in lubricated sliding of roller surfaces, which were manufactured to simulate the real gear surfaces. By examining 3D surface topography of two mating bodies, both surface roughness and its effect on friction behaviour can be studied. In a previous study, a rough-friction test rig has been designed, constructed and initially verified. The types of surfaces involved in this study are ground, shot-peened, phosphated and electrochemically deburred. These rollers were subjected to the same friction testing procedures. Roller surfaces were then examined, and correlation between the topography and the frictional behaviour was analysed. Friction behaviour was interpreted in terms of Stribeck curves (friction coefficient as the function of Hersey parameter (ην/p)). The results showed that electrochemically deburred and certain phosphated surfaces provide lower friction coefficient values which are competitive to fine-ground surfaces in lubricated rolling/sliding contact. © 2003 Elsevier Science B.V. All rights reserved.

  • 125.
    Zahouani, Hassan
    et al.
    Laboratoire de Tribologie et Dynamique des Systèmes, ENIS, St. Etienne, France.
    Mezghani, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    El Mansori, M.
    Laboratoire de Mécanique et de Procédés de Fabrication, Arts et Métiers ParisTech, Châlons en Champagne, France.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK).
    Effect of Hölder Exponent of Roughness in Contact and Dry Friction Problems2009In: Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces / [ed] P. Pawlus, L. Blunt, B.-G. Rosén, T. Thomas, M. Wieczorowski, H. Zahouani, Rzeszow: Rzeszow Univ. of Technology , 2009Conference paper (Refereed)
  • 126.
    Zahouani, Hassan
    et al.
    Laboratoire de Tribologie et de Dynamique des Systèmes, Ecole Centrale de Lyon, Ecully, FRANCE; Ecole Nationale d'Ingénieurs, Saint-Etienne, France.
    Rosén, Bengt-Göran
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    Thomas, Tom R.
    Halmstad University, School of Business and Engineering (SET), Mechanical Engineering and Industrial Design (MTEK), Functional Surfaces.
    10th International Conference on Metrology & Properties of Engineering Surfaces: Guest editorial2008In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 264, no 5-6, p. 381-381Article in journal (Refereed)
123 101 - 126 of 126
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