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  • 51.
    Nilsson, Bertil
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Hansbo, Peter
    Department of Applied Mechanics, Chalmers University of Technology, Gothenburg, Sweden.
    Adaptive finite element solution of a cavitation problem in hydrodynamic lubricationManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    We present an adaptive finite element method for a cavitation model based on Reynolds' equation. A posteriori error estimates and adaptive algorithms are derived, and numerical examples illustrating the theory are supplied.

  • 52.
    Osberg, Jacob
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Konov, Vadim
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Utveckling av extraherbar kärna: Koenigsegg2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
  • 53.
    Pawlus, Paweł
    et al.
    Rzeszóv University of Technology.
    Blunt, LiamHuddersfield University.Rosén, Bengt-GöranHögskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.Thomas, TomHögskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.Wieczorowski, MichalPoznan University of Technology.
    Proceedings of the 12th International Conference on Metrology and Properties of Engineering Surfaces2009Konferanseproceedings (Fagfellevurdert)
  • 54.
    Philip, Rony
    et al.
    Amrita University, Coimbatore, India.
    Löfgren, Hans
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Experimental Verification of an Instrument to Test Flooring Materials2018Inngår i: IOP Conference Series: Materials Science and Engineering, Bristol: Institute of Physics Publishing (IOPP), 2018, Vol. 310, nr 1, artikkel-id 012121Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The focus of this work is to validate the fluid model with different flooring materials and the measurements of an instrument to test flooring materials and its force attenuating capabilities using mathematical models to describe the signature and coefficients of the floor. The main contribution of the present work focus on the development of a mathematical fluid model for floors. The aim of the thesis was to analyze, compare different floor materials and to study the linear dynamics of falling impacts on floors. The impact of the hammer during a fall is captured by an accelerometer and response is collected using a picoscope. The collected data was analyzed using matlab least square method which is coded as per the fluid model. The finding from this thesis showed that the fluid model works with more elastic model but it doesn't work for rigid materials like wood. The importance of parameters like velocity, mass, energy loss and other coefficients of floor which influences the model during the impact of falling on floors were identified and a standardized testing method was set. © Published under licence by IOP Publishing Ltd.

  • 55.
    Rebeggiani, Sabina
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    On Polishability of Tool Steels2013Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    One of the world’s fastest growing industries is the plastic industry. Today’s ever increasing demands of high quality products, shorter lead times and reduced costs push development and research forwards. Moulds for plastic injection moulding need to have a functional surface to meet demands on demoulding and wear properties, but also to produce the required final surface quality, which for ‘standard mould qualities’ of high gloss applications means nearly defect free, shiny and smooth mould surfaces with roughness levels in the nm-range.

    The aim of this thesis was to develop a metrology framework to quantitatively characterise these mould surfaces in order to gain better understanding of which defect structures are critical at injection moulding, and how these are correlated to material properties and operating conditions in surface preparation of tool steels. In practice this means to capture surface features of some few nm in height/depth up to some hundreds of microns in lateral dimension within insert areas of cm2 and larger. Experiments combining polishers’ experience with steel producers’ as well as non-contact areal texture examinations of surface topography were performed to overcome and link practical skills to academic ones.

    Based on areal surface metrology, defect classification and image analysis based surface characterisation, an evaluation procedure for polished tool steel surfaces was developed, initially tested and verified. The suggested method involves descriptions of relevant defect structures and acceptance levels for high gloss polished tool steels in the form of numerical parameter values based on interferometric measurements. It was also concluded that the cleanness of the steels was less important as long as it was kept within reasonable levels; the surface preparation strategy is a major factor influencing the mould surface quality e.g. it was found that a ‘several-step-strategy’ was favourable to avoid defect structures; not all ‘mirror-like’ mould surfaces had desirable topographies for injection moulding, therefore a well-defined mould surface assessment with numerical values describing mould surface quality is necessary to secure effective mould surfaces.

  • 56.
    Rebeggiani, Sabina
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Polishability of tool steels: Characterisation of high gloss polished tool steels2009Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The manufacturing of plastic components, like a majority of other mass produced discrete parts, require well designed dies and moulds. Complex geometries and increasing demands on final surface appearance, which is strongly connected to the quality impression, are pushing for high demands on mould-makers and polishers as well as steel producers. Moulds for production of shiny plastic components require tool steels with low defect levels to achieve highly gloss and very smooth mould surfaces (roughness levels in the nm-range).

    It is the ability to achieve those mirror-like surfaces, the polishability of tool steels, that is the central part in this study. To increase the understanding of how material properties and different surface preparation techniques impact the polishability, a selection of high gloss polished tool steel qualities were characterised using non-contact 3D-surface texture analysis.

    A first step towards a grading system of the polishablility was made based on a classification of surface defects detected on included steel samples. 3D surface parameters based on interferometer measurements seemed to be useful for a characterisation, even though further studies (involving different filters and segmentation methods) are needed to find less and more precise parameter values to grade tool steel qualities.

    Future work will include analysis of surface measurements of test moulds and plastic parts, as well as studies of how quantitative parameters can be linked to qualitative estimations in order to better understand how surface features on the mould are transferred into the surface of plastic components.

  • 57.
    Rebeggiani, Sabina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Factors influencing the surface quality of polished tool steels2014Inngår i: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 2, nr 3, artikkel-id 035004Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Today’s demands on surface quality of moulds for injection moulding of plastic components involve no/low defect contents and roughness levels in the nm-range for high gloss applications. Material properties as well as operating conditions influence the mould finish, and thus the final surface of moulded products. This paper focuses on how particle content and different polishing strategies influence final surface qualities of moulds. Visual estimations of polished tool steel samples were combined with non-contact 3D-surface texture analysis in order to correlate traditional assessments to more quantitative methods, and to be able to analyse the surfaces at nanometer-level.

    It was found that steels with a lower proportion of particles, like carbides and oxides, gave rise to smoother polished surfaces. In a comparative study of polishers from different polishing shops, it was found that while different surface preparation strategies can lead to similar final roughness, similar preparation techniques can produce high-quality surfaces from different steel grades. However, the non-contact 3D-surface texture analysis showed that not all smooth polished surfaces have desirable functional topographies for injection moulding of glossy plastic components.

  • 58.
    Rebeggiani, Sabina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Quantitative evaluation of the surface finish of high gloss polished tool steels2014Inngår i: Surface Topography: Metrology and Properties, ISSN 2051-672X, Vol. 2, nr 1, artikkel-id 014002Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Standardized procedures to measure and estimate surface qualities of moulds for injection moulding of plastic components do not exist. Instead, steel producers as well as polishers and mould-users need to rely on master plaques for tactile comparisons and/or their own visual estimations for surface quality controls. This paper presents an overview of various surface evaluation methods of steels, including existing standards and available surface metrology. A new method to evaluate high gloss polished tool steel surfaces, based on a three-dimensional non-contacting measurement technique, is presented. The suggested method is based on defect extraction, and should be useful for both specifications and quality controls. Included defects were found to be quality criteria for polished tool steel surfaces. The surface acceptance levels and defect classification are based on interviews and questionnaires, as well as literature studies and visual estimations of test samples made by experienced polishers. © 2014 IOP Publishing Ltd.

  • 59.
    Rebeggiani, Sabina
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Quantitative evaluation of the surface finish of high gloss polished tool steels2013Inngår i: Metrology and Properties of Engineering Surfaces, 2013: Proceedings of the 14th International Conference, Taipei, Taiwan, June 17-21, 2013, 2013, s. 207-218Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Standardised procedures to measure and estimate surface qualities of moulds for injection moulding of plastic components do not exist. Instead, steel producers as well as polishers and mould-users need to rely on master plaques for tactile comparisons and/or their own visual estimations for surface quality controls.

    This paper presents an overview of various surface evaluation methods of steels, including existing standards and available surface metrology. A new method to evaluate high gloss polished tool steel surfaces, based on a 3D non-contacting measurement technique, is presented. The suggested method is based on defect extraction, and should be useful for both specifications and quality controls. Included defects were found to be quality criteria for polished tool steel surfaces. The surface acceptance levels and defect classification are based on interviews and questionnaires, as well as literature studies and visual estimations of test samples made by experienced polishers.

  • 60.
    Reddy, Vijeth Venkataram
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Flys, Olena
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). Research Institute of Sweden, Borås, Sweden.
    Chaparala, Anish
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Berrimi, Chihab E.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap.
    Vedantha Krishna, Amogh
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Study on surface texture of Fused Deposition Modeling2018Inngår i: Proceedings of the 8th Swedish Production Symposium (SPS 2018) / [ed] Mauro Onori, Lihui Wang, Xi Vincent Wang, Wei Ji, Amsterdam: Elsevier, 2018, Vol. 25, s. 8s. 389-396Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Fused Deposition Modeling (FDM) is mostly used to develop functional prototypes and in some applications for end-use parts. It is important to study the surfaces produced by FDM to understand the certainty of process. Truncheon design test artefacts are printed at different print settings and surfaces are measured using stylus profilometer. Taguchi’s design of experiments, signal-to-noise ratio and multiple regression statistics are implemented to establish a concise study of the individual and combined effect of process variables on surface texture parameters. Further, a model is developed to predict the roughness parameters and is compared with experimental values. The results suggest significant roughness parameter values decrease with increase in build inclination and increases with increase in layer thickness except the roughness peak count. © 2018 The Authors. Published by Elsevier B.V

  • 61.
    Reddy, Vijeth Venkataram
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Tam, Pui Lam
    Chalmers University, Gothenburg, Sweden.
    Vedantha Krishna, Amogh
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Subsurface Characterization of Turned Brass alloys using Backscattered Electron Microscopy2017Inngår i: Mets&Props 2017: 16th International Conference on Metrology and Properties of Engineering Surfaces: Conference abstracts, 2017, s. 14-15Konferansepaper (Fagfellevurdert)
  • 62.
    Reddy, Vijeth Venkataram
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Vedantha Krishna, Amogh
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Schultheiss, Fredrik
    Lund University, Lund, Sweden.
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor. Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Lead free Brass: Topography Characterization2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The negative effects of lead on human health and the recycling problems of copper alloys with lead content has led to the increase in concern for reducing/eliminating the use of lead in brass and other copper alloys. Many materials are considered to replace lead in brass; silicon is one such alternative. The real challenge prevails in sustainable manufacturing of lead free brass, to maintain control of the surface integrity when substituting the lead content in the brass with silicon. The investigation includes defined areal surface parameters measured on the turned samples of lead- and lead free brass using an optical coherence scanning interferometer, CSI.This paper deals with the study of surface topography of turned samples of lead and lead free brass. It is important to study the topographical characteristics of the brass samples which are the intermediate link between the manufacturing process variables and the functional behaviour of the surface. To numerically evaluate the sample’s surface topography and to validate the measurements for a significant study, a general statistical methodology is implemented. The results suggest that the surface roughness is higher in lead brass compared to lead free brass and tool coatings have significant influence on the hybrid (Sdr & Sdq) parameters in the surface topography of brass samples.

  • 63.
    Rosén, Bengt-Göran
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor. Chalmers University of Technology, Gothenburg, Sweden .
    Fall, Andreas
    SCA Hygiene Products AB, Göteborg, Sweden.
    Rosén, Stefan
    Toponova AB, Halmstad, Sweden.
    Farbrot, Anne
    SCA Hygiene Products AB, Gothenburg, Sweden.
    Bergström, P.
    SCA Hygiene Products AB, Gothenburg, Sweden.
    Topographic modelling of haptic properties of tissue products2014Inngår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 483, artikkel-id 012010Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The way a product or material feels when touched, haptics, has been shown to be a property that plays an important role when consumers determine the quality of products For tissue products in constant touch with the skin, softness" becomes a primary quality parameter. In the present work, the relationship between topography and the feeling of the surface has been investigated for commercial tissues with varying degree of texture from the low textured crepe tissue to the highly textured embossed- and air-dried tissue products. A trained sensory panel at was used to grade perceived haptic "roughness".

    The technique used to characterize the topography was Digital light projection (DLP) technique, By the use of multivariate statistics, strong correlations between perceived roughness and topography were found with predictability of above 90 percent even though highly textured products were included. Characterization was made using areal ISO 25178-2 topography parameters in combination with non-contacting topography measurement. The best prediction ability was obtained when combining haptic properties with the topography parameters auto-correlation length (Sal), peak material volume (Vmp), core roughness depth (Sk) and the maximum height of the surface (Sz). © Published under licence by IOP Publishing Ltd.

  • 64.
    Rosén, Bengt-Göran
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Nilsson, Bertil
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Thomas, Tom R.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Wiklund, Daniel
    Chalmers University of Technology, Gothenburg, Sweden.
    Xiao, Li
    Chalmers University of Technology, Gothenburg, Sweden.
    Oil pockets and surface topography: Mechanisms of friction reduction2004Konferansepaper (Annet vitenskapelig)
    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.

  • 65.
    Schwope, L-A
    et al.
    Solidica Inc., Ann Arbor, Michigan, USA.
    Friel, R. J.
    Wolfson School of Mechanical & Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Johnson, K. E.
    Solidica Inc., Ann Arbor, Michigan, USA.
    Harris, R. A.
    Wolfson School of Mechanical & Manufacturing Engineering, Loughborough University, Loughborough, United Kingdom.
    Field repair and replacement part fabrication of military components using ultrasonic consolidation cold metal deposition2009Inngår i: NATO Science and Technology Organization: RTO-MP-AVT-163 - Additive Technology for Repair of Military Hardware, 2009, s. 22-1-22-12Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Timely repair and replacement of military components without degrading material properties offers tremendous opportunities for cost and schedule savings on a number of military platforms. Effective field-based additive manufacturing repair approaches have proven difficult to develop, as conventional additive metal deposition technologies typically include a molten phase transformation and controlled inert deposition environments. The molten stage of laser and electron beam based additive processes unfortunately results in large dimensional and microstructural changes to the component being repaired or re-fabricated. As a result, high residual stresses and unpredictable ductility profiles in the repair area, or the re-fabricated part, make the final product unsafe for redeployment. Specifically, the heat affected zone associated with traditional deposition-based repair methods can produce a low strength, non-homogenous region at the joint; these changes in the materials properties of the repaired parts are detrimental to the fatigue life, and are a major concern where cyclic loading is experienced. The use of solid state high power Ultrasonic Consolidation (UC) technologies avoids the liquid-solid transition complexity and creates a predictable “cold” bond. This method then allows for strong, homogenous structures to be manufactured and repaired in the field and opens the door for the use of high strength repair material that may reduce the frequency of future failure itself. In addition, UC further offers the opportunity to provide enhanced functionality and ruggedness to a component either during repair or from original manufacture by allowing the embedding of passive and functional elements into the new fabricated component or feature.

  • 66.
    Senagic, Aida
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
    Aktivitetsbassäng i FHC Laholmskommun - tillståndsanalys2010Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Simbassängen i Folkhälsocentrum i Laholm har drabbats av skador. Läckage i skvalprännorna har orsakat problem i de övriga konstruktionsdelarna.

    Laholmskommun har år 2002 vidtagit akuta åtgärder i hopp om att stoppa läckage och förebygga ännu större skador. Reparationsarbetet utfördes och efter två år konstaterades fortsatt läckage.För att kunna bedömma skadornas omfattning och orsak utförs en tillståndsbedömning av befintlig konstruktion.

    Tillståndsbedömningen kommer att ligga till grund för val av reparationsmetoder och reparationsomfattning.

    Det största problemet är armeringskorrosion föranled av karbonatisering och kloridinträngning.

    Hela konstruktionen befinner sig i en väldigt aggressiv miljö som accelererar hela nedbrytningsprocessen.

    Genom att göra okulärbesiktning och laboratorieanalys har jag kommit fram till att skadorna är omfattande och reparationsarbeten kommer att vara därefter.

  • 67.
    Siddiqui, Muhammad Saad
    et al.
    Högskolan i Halmstad. Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Iqbal, Tahseen
    Högskolan i Halmstad. Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Development of PDI plates for Industrial Applications2010Independent thesis Advanced level (degree of Master (One Year)), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    The aim of this Master’s Degree thesis project is to design and develop point diffraction interferometer plates. In this project the PDI plates are re-designed, changing the design which was used in previous projects in Halmstad University. The transparency of PDI plates can be controlled by coating them with NiCr film. Firstly, four plates with coating of different thickness of NiCr were developed. The relationship between transmittance and the thickness of NiCr was established by testing these plates for transmittance and reflectance with the help of a laser and an optical power meter.

    The absorption coefficient of clear substrates and reflection of light is also taken into account to achieve the correct results. The parameters like the diameter of semi-transparent area around the pinholes and the size of pinholes is chosen after fully understanding its application. The lay-out and description of design is also included in the report.

  • 68. Stålnacke, Ricard
    Övergång till helkrossballast: En studie för Strängbetongfabrikerna i Veddige och Herrljunga2009Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    This exam report has been developed in association with Strangbetong AB, Sweden.

    The natural gravel that is being used as fine aggregate for concrete production today is an ending natural recourse and the Swedish government has decided to strongly reduce the extraction from the year of 2020. The only reasonable replacement is aggregates from crushed rocks but this material has other properties than natural aggregates. The concrete manufacturers now have to learn how to use these new fine aggregates in a cost effective way in order to ensure the quality of their concrete production.

    In this project, crushed aggregates and combination of crushed and natural aggregates have been tested with existing formulas for fresh concrete. The two parameters yield stress and plastic viscosity have been measured which gives a good description of the workability of the fresh concrete. Different methods to make measurements on the dry fine aggregates, has also been tested, to find out if there is any correlations between these parameters and the parameters from the measurement on the fresh concrete.

  • 69.
    Svensson, Martin
    et al.
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    Johannesson, Joacim
    Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE).
    The Human Gyroscope: A prototype2013Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
  • 70.
    Thomas, T. R.
    et al.
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    Rosén, Bengt-Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    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 study2009Inngår i: 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, s. 209-215Konferansepaper (Fagfellevurdert)
    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.

  • 71.
    Vedantha Krishna, Amogh
    et al.
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Flys, Olena
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS). RISE, Research Institutes of Sweden, Borås, Sweden.
    Reddy, Vijeth Venkataram
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Leicht, Alexander
    Chalmers University of Technology, Gothenburg, Sweden .
    Hammar, Lars
    Chalmers University of Technology, Gothenburg, Sweden .
    Rosén, Bengt Göran
    Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Rydberglaboratoriet för tillämpad naturvetenskap (RLAS).
    Potential approach towards effective topography characterization of 316L stainless steel components produced by selective laser melting process2018Inngår i: European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 18th International Conference and Exhibition, EUSPEN 2018, Bedford: euspen , 2018, s. 259-260Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, an attempt is made to explain the surface texture of Selective Laser Melting (SLM) parts more satisfyingly than the existing methods. Investigations were carried out on the 316L stainless steel SLM samples. To account for most of the surface conditions, a truncheon artefact was employed for the analysis. A Stylus Profilometer was employed as a metrology tool for obtaining the 3D surface measurements. A methodology is proposed to extract and characterize the topographic features of Additive Manufactured (AM) surfaces. Here, the overall roughness of the surface is segregated into the roughness of the powder particles and the waviness due to thermal and the “staircase” effects. Analyzing these features individually results in an increased understanding of the AM process and an opportunity to optimize machine settings.

  • 72.
    Wiklund, Daniel
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK).
    Tribology of stamping: the influence of designed steel sheet surface topography on friction2006Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Tribology is the science of friction, wear, and lubrication; the interaction of surfaces in relative motion. The tribological conditions in sheet metal forming influences the flow of material in forming operations, the strain distributions of sheet material, extent of wear, and thereby the quality of products. The purpose of the thesis is to increase the knowledge of why and how sheet surface topography influence the frictional response in stamping, to characterise the geometrical properties, and make results applicable for industry. The frictional response of different surface topographies have been measured in a Bending Under Tension test under mixed lubricated conditions. The studied materials have been stainless steel sheets and uncoated and coated carbon steel sheets. The results did show the influence of roughness, skewness, and anisotropy of surface topography. The findings could be explained by the theory of pad bearings. A new functional 3D parameter (Sq>0) was developed for pressing performance that is sensitive to the effects of roughness and skewness. The texture-aspect ratio parameter (Str) was found to be correlated to the anisotropical behaviour of the frictional response. The results are very tangible and mean increased control of stamping operations. An initial step was taken to introduce more advanced tribological models in FE simulation of sheet metal forming operations. The aim is to decrease the trial-and-error time in the design process of dies and tools. A friction model considering surface topography (Sq>0), sliding velocity, lubricant viscosity, and apparent pressure, was successfully implemented. Simulations of a part were evaluated with real stamping tryouts. The results did show the potential of improving the precision in forming simulations with more advanced tribological models. Finally, theory and characterisation methods of active micro-oil pockets in the contact zone of tool and sheet were investigated. The real contact area was shown to be the critical feature to determine. Therefore, two topographical methods and one microscope-imaging processing technique were studied, but no method was found to be viable. However, the experimental results did not confirm the importance of microoil pockets in mixed lubricated regime.

  • 73.
    Xiao, L.
    et al.
    Chalmers University of Techonology, Göteborg.
    Rosén, Bengt Göran
    Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), Maskinteknisk produktframtagning (MTEK), Funktionella ytor.
    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 coatings2005Inngår i: 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, s. 213-220Konferansepaper (Fagfellevurdert)
12 51 - 73 of 73
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