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  • 301.
    Lang, Jenny
    et al.
    SP Technical Research Institute of Sweden, Borås, Sweden.
    Lim, Jang-Kwon
    Acreo Swedish ICT, Kista, Sweden.
    Hellén, Johan
    Saab AB, Gothenburg, Sweden.
    Nilsson, Torbjörn M.J.
    Saab AB, Gothenburg, Sweden.
    Schodt, Bo
    SP Technical Research Institute of Sweden, Copenhagen, Denmark.
    Poder, Ralf
    SP Technical Research Institute of Sweden, Copenhagen, Denmark.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Bakowski, Mietek
    Acreo Swedish ICT, Kista, Sweden.
    Leisner, Peter
    SP Technical Research Institute of Sweden, Borås, Sweden.
    Reliability study of a RF power amplifier with GaN-on-SiC HEMTs2016Inngår i: ECS Transactions, Pennington, N.J.: Electrochemical Society, 2016, Vol. 75, nr 12, s. 49-59Konferansepaper (Fagfellevurdert)
    Abstract [en]

    RF power amplifier demonstrators containing each one GaN-on- SiC, HEMT, CHZ015A-QEG, from UMS in SMD quad-flat noleads package (QFN) were subjected to thermal cycles (TC) and power cycles (PC) and evaluated electrically, thermally and structurally. Two types of lead-free solders (Sn63Pb36Ag2 and SnAgCu (SAC305)) and two types of TIM materials (NanoTIM and TgonTM 805) for PCB attachment to liquid cold plate were tested for thermo-mechanical reliability. Changes in electrical performance of the devices namely reduction of the current saturation value, threshold voltage shift, increase of the leakage current and degradation of the HF performance were observed as a result of an accumulated current stress during PC. No significant changes in the investigated solder or TIM materials were observed.

  • 302.
    Larsson, Kristoffer
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Nyutveckling av Huddigs spakkonsoler för modellerna 1060 och 12602008Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Sammanfattning

    Författaren Kristoffer Larsson har skrivit rapporten tillsammans med grävlastarstillverkaren Huddig i Hudiksvall. Rapporten beskriver nyutvecklingen av Huddigs spakkonsoler. Bakgrunden till examensarbetet är att Huddig har haft kontinuerlig utveckling av sin interiör och hytt men spakkonsolerna har inte följt med i den utvecklingen. Målet med examensarbetet var att ta fram fyra olika prototyper med hänsyn på utformning, handergonomi, knapplacering, trängstyrningsfunktion, rototilt, materialval och tillverkningsmetod.

    För att författaren skulle få en bild av vad det fanns för kundsynpunkter och vad andra personen som har en relation till Huddig har för synpunkter gjordes en marknadsundersökning. Därefter följde arbetet med att bryta ned arbetet och produkten i delar med olika metoder.

    Åtta olika konceptförslag skissades fram och slutligen sållades sex olika delar från koncepten fram. En grupp från Huddig och författaren Kristoffer Larsson tyckte dessa delar var bäst lämpade att gå vidare med. De delar som gick vidare var:

    − Konisk underdel

    − Kantig form

    − Dubbla rader med knappar på vänster konsol

    − Utåtlutande trängstyrning

    − Fram/back utåtlutande

    − Tvåhandsgrepp för trängstyrningen

    − Placering av stödbensreglage

    Utifrån dessa kommentarer och synpunkter på de framsållade koncepten skissade författaren fram fyra koncept som valdes att göras prototyper av. Skälet till att prototyper valdes att tillverkas var att det är svårt att känna och testa om ett koncept verkligen fungerar eller inte genom att bara kolla på en skiss.

    Målet med examensarbetet var att generera fram unika koncept men även att tillverka prototyper av dem, vilket uppnåddes. Utifrån resultat av denna rapport och prototyperna kan Huddig fortsätta att utveckla spakkonsolerna till en genomtänkt och smart lösning.

  • 303.
    Leek, Tobias
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Larsson, Andreas
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    A Reversible Engineering Process2007Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    To study engineering can be difficult, especially transforming theoretical knowledge into practice. To address this issue, Otto and Wood have developed a reverse engineering and redesign methodology, suggesting that it can be used as a tool in the process of learning mechanical engineering and design. The aim with this report is to

    evaluate this statement, emphasizing on the reverse engineering process and evaluating its usefulness as an educational tool. In order to fully understand the process, two cordless screwdrivers will be reverse engineered, functioning as an example throughout the report. A theoretical background of the process will be

    introduced, including descriptions concerning the different steps and their encompassed tools, tests and methods. Trough the implementation, the screwdrivers are disassembled, analysed and experienced, resulting in a clear product specification

    with information of components and product functions. One example is the assembly plan, were the product structure is presented as two subassemblies with “layer on layer” assembly. Another result of the implementation is that the reverse engineering

    process was experienced in reality, exposing the required modifications necessary in order to function as an educational tool. The main issue for the process is its focus on customer needs instead of product focus. Therefore, it is suggested that a new reverse

    engineering process based on the existing one should be developed, focusing more on the product and less on the customer to better suit an educational purpose.

  • 304.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    About the effect of anodic pulses and periodic current reversion on electrodeposits2012Konferansepaper (Fagfellevurdert)
  • 305.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Deposizione pulsate di cromo duro con inversione di corrente2008Inngår i: Galvanotecnica e nuove finiture, ISSN 1121-855X, Vol. 2, s. 84-89Artikkel i tidsskrift (Annet vitenskapelig)
  • 306.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    EAST – European Academy of Surface Technology2015Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, Vol. 93, nr 6, s. 281-Artikkel i tidsskrift (Fagfellevurdert)
  • 307.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Electrolytic methods for manufacturing of miniaturized structures2015Inngår i: EAST Special Forum, Milano, 1-2/10, 2015., 2015Konferansepaper (Fagfellevurdert)
  • 308.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Pulse plating of copper on printed circuit boards2012Inngår i: Pulse Plating: including 25 tables / [ed] W. Hansal & S. Roy, Eugen G. Leuze Verlag , 2012Kapittel i bok, del av antologi (Fagfellevurdert)
  • 309.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Pulse reversal plating of hard chromium2008Inngår i: Galvanotecnica e nuove finiture, ISSN 1121-855X, Vol. 2, s. 84-89Artikkel i tidsskrift (Annet vitenskapelig)
  • 310.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Pulse reversal plating of hard chromium2008Konferansepaper (Annet vitenskapelig)
  • 311.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Survey of pulse plating of copper from sulphuric acid solutions2010Konferansepaper (Annet vitenskapelig)
  • 312.
    Leisner, Peter
    et al.
    Jönköping University, Tekniska Högskolan, JTH, Material och tillverkning.
    Baumgaertner, Manfred
    FEM, Schwäbisch Gmünd, Germany.
    30 years anniversary workshop of European Academy of Surface Technology2020Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 98, nr 2, s. 59-61Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 313.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Influence of process parameters on crack formation in direct current and pulse reversal plated hard chromium2009Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 87, nr 2, s. 90-96Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It has for a long time been known that crack free chromium coatings can be obtained by pulse reversal plating, but it has only much later been understood that reoxidation of hydrogen from the surface during the anodic periods is essential for obtaining crack free deposits. In this paper, it is shown that a specific anodic charge depending on the charge of the previous cathodic pulse is needed to obtain a crack free coating and that residual stress in the coating will be less at more frequent current reversals. Furthermore, too large an anodic charge will result in redissolution of chromium and thereby decrease the current efficiency.

  • 314.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Møller, Patrick
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Additive-free pulse reversal plating of cupper on printed circuit boards2003Inngår i: EAST-Forum 2003, 2003Konferansepaper (Fagfellevurdert)
  • 315.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Hansal, W.
    Pulse plating of chromium2012Inngår i: Pulse Plating / [ed] Wolfgang E. G. Hansal & Sudipta Roy, Bad Saulgau: Eugen G. Leuze Verlag , 2012, s. 250-268Kapittel i bok, del av antologi (Fagfellevurdert)
  • 316.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. RISE Research Institutes of Sweden, Borås/Stockholm, Sweden.
    Johansson, E.
    RISE Research Institutes of Sweden, Borås/Stockholm, Sweden.
    Aspects to be considered when making innovation out of promising research results in surface technology2019Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 97, nr 2, s. 67-72Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the eyes of industrialists, scientists often exaggerate the economic potential of their findings. The industrialists know that developing a new technology to production is associated with uncertainty and risks. To elucidate the challenges faced by the surface treatment industry, this paper discusses aspects that should be considered when making innovation out of promising research results. The Technology Readiness Level (TRL) metric for assessing maturity of a technology is discussed and exemplified. Additional risks of fluid character such as legislation, price of raw material and customer expectations are also discussed. Even though, the subject is of general relevance, the present discussion refers to surface technology and examples are given from copper plating of printed circuit boards, and durable and cost-efficient coatings on electrical connectors. 

  • 317.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Möller, Patrick
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Fredenberg, Mikael
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Pulse reversal plating of copper for electronics applications2006Konferansepaper (Annet vitenskapelig)
  • 318.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Möller, Patrick
    Fredenberg, Mikael
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Recent progress in pulse reversal plating of copper for electronics applications2007Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 85, nr 1, s. 40-45Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Based on demands for modern printed circuit board (pcb) manufacturing, the copper electroplating process is discussed. Electroplating from an additive free solution using low frequency pulse reversal plating with superimposed cathodic pulsation is suggested, which meets the demands for precise dimensions, high ductility and conductivity, low costs and environmental friendliness.

  • 319.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. RISE Research Institutes of Sweden, Borås, Sweden.
    Nielsen, Lars Pleth
    Danish Technological Institute, Tribology Centre, Aarhus, Denmark.
    Offshoring and backshoring of surface finishing from the perspective of the Nordic countries2019Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 97, nr 2, s. 54-56Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Backshoring of production to Western Europe has become an increasingly important trend after decades of offshoring. The subject is introduced by a general discussion followed by a specific analysis of the Nordic surface finishing industry. The main finding is that production quality is the main driver for backshoring of surface finishing. 

  • 320.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. RISE Res Inst Sweden, Elect Dept, Borås, Sweden.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Application of Assaf panel for evaluating throwing power of pulse reverse electroplating on complex geometries2018Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 96, nr 5, s. 258-264Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Assaf panel arrangement was used for evaluating pulse reverse plating processes and optimisation of the throwing power (TP) of complex three-dimensional (3D) geometries. Two different electroplating processes were investigated: an acid copper bath and a cyanide silver bath without additives. It has not been possible to establish a direct correlation factor for TP obtained with the Assaf panel and the 3D objects included in the trials. Nevertheless, the Assaf panel was found to be a useful tool for preliminary process parameter optimisation. The copper bath needs agitation to deposit coatings of good quality, whereas the silver bath obtains the best throwing power without agitation. The latter is probably due to inhibition by adsorbed cyanide.

  • 321.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Elektroplätering av antibakteriella beläggningar2015Inngår i: Ytforum, ISSN 0349-4470, nr 1, s. 23-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 322.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Introduction to pulse plating2016Konferansepaper (Fagfellevurdert)
  • 323.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. SP Technical Research Institute of Sweden, Borås, Sweden.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Belov, Ilia
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Edström, C.
    SP Technical Research Institute of Sweden, Borås, Sweden.
    Sandulache, G.
    Happy Plating, Wiener Neustadt, Austria.
    Hansal, W. E. G.
    Happy Plating, Wiener Neustadt, Austria.
    Control of silver throwing power by pulse reverse electroplating2017Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 95, nr 1, s. 25-30Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of electroplating parameters on throwing power (TP) is studied in additive-free silver cyanide solutions under direct current and pulse reverse electroplating conditions. It is found that the best TP is obtained when no agitation of the electrolyte is applied. The most important parameters for controlling the TP are the cathodic current density, the anodic to cathodic charge ratio, and the ratio between the anodic and cathodic current densities. Guidelines for process optimisation are given.

  • 324.
    Leisner, Peter
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Edström, Curt
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Sandulache, G.
    Hansal, W.
    Influence of pulse reverse plating parameters on throwing power in a silver cyanide bath2016Konferansepaper (Annet vitenskapelig)
  • 325.
    Lekka, M.
    et al.
    University of Udine, Udine, Italy.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. RISE Research Institutes of Sweden, Borås, Sweden.
    New European Training Network solving corrosion problems on micro- and nanoscale: mCBEEs2017Inngår i: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 95, nr 6, s. 297-298Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    mCBEEs is an acronym for: Advanced integrative solutions to Corrosion problems beyond micro-scale: towards long-term durability of miniaturised Biomedical, Electronic and Energy systems. It is a doctoral student training network funded by the European Commission under the Marie Sklodowska-Curie Action scheme in the same way as the recently reported training network SELECTA that is focusing on smart electrodeposited alloys for environmentally sustainable applications.

  • 326.
    Lidumnieks, Kriss
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Thermal Analysis and Numerical Validation of the heating process in Greensand molding mixtures2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This master thesis aimed to study thermo-physical properties of greensand molding material depending on different amounts of constituents in the material. Greensand is used in casting industry by most of the world foundries. The thesis work tried to give answer on how bentonite clay, coal dust additive and water content affects the heat transport capacity and which of these ingredients have the highest effect on the thermo-physical properties of greensand. During the work, the calculated properties were also used in numerical simulations of heating curves and compared to the experimentally recorded ones.

    Novel Fourier thermal analysis method was used for the first time to study thermo-physical properties of greensand depending on different amounts of bentonite and coal dust additive. By the use of experimental procedure developed by other authors, the thermo-physical properties could be measured and the effect of ingredients investigated in more depth.

    During the experimental work, 6 different greensand mixtures with typical parameters used in foundries were prepared and tested by immersing spherical samples in liquid iron and liquid aluminum melts. The heating curves were recorded and further analyzed. The thermo-physical properties were calculated and further investigated and used in numerical calculation to simulate the experimentally recorded heating curves with control volume-based finite difference method in one dimensional spherical coordinates.

    The results revealed that the bentonite and coal dust additive increase have the same effect on increase of total absorbed heat by the greensand, however, coal dust additive gives extra functionality to greensand by enabling the greensand to absorb all the heat at lower temperatures compared to greensand with no additions of coal dust additive.

    The provided information about the thermo-physical properties of greensand are novel findings to the field of greensand research.

  • 327.
    Lidumnieks, Kriss
    et al.
    Sperre Baltic SIA, Riga, Latvia.
    Svidró, József Tamás
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    The effect of various production parameters on the heat absorbing capacity of greensand2018Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 31, nr 1, s. 7-13Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Greensand is a widely-used material to produce sand moulds in high production, mainly for iron casting applications. Several authors have studied the high temperature behavior of greensand regarding to the vapour condensation and transfer zones, and the effect of different production parameters on the thermal conductivity. This work focuses on the effect of the mixture composition on the heat absorption (cooling) capacity of the greensand. During the experimental work, various greensand mixtures with changing bentonite + water and coal dust contents were prepared and tested by a novel application of Fourier thermal analysis. The method provides new thermophysical knowledge about moulding sand, through applying real casting conditions by the immersion of spherical sand samples into liquid iron. The findings of the work direclty contribute to the area of thermal sciences and also brings novel understandings to foundry technology in general.

  • 328. Lindgren, Mats
    et al.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Johansson, Alf
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Data- och elektroteknik.
    Danielsson, Torkel
    Gunnarsson, Niklas
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Multi-disciplinary Approach to Design of a Power Electronics Module for Harsh Environments2009Inngår i: Thermal, Mechanical and Multi-Physics simulation and Experiments in Microelectronics and Microsystems, 2009: EuroSime 2009, 2009, s. 1-8Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A set of experimental and computer simulation methods has been applied to reliability analysis of a newly designed resin transfer molded power electronics module for automotive applications, comprising the glass-fiber epoxy multi-layer PCB, populated with various electronic packages. Evaluation of thermo-mechanical stability, determination of moisture ingress, and testing the adhesion quality between the molding compound and the module PCB have been performed along with investigation of heat transfer paths in the module. The experiments in harsh environments have revealed thermo-mechanical stability and acceptable moisture ingress for the module test samples with relatively large BGA components on the glass-fiber epoxy PCBs of different thickness and different solder mask types. Thermal images of the module have been obtained and the CFD model was created and validated with temperature measurements in power-on tests. Extreme heat dissipation modes have been studied by modeling.

  • 329.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Experimental Evaluation of Glob-top Materials for use in Harsh Environments2005Inngår i: Journal of Microelectronics and Electronic Packaging, ISSN 1551-4897, E-ISSN 1555-8037, Vol. 2, nr 4, s. 253-268Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This article presents results of experimental evaluation of glob-top materials for multi-chip-modules (MCM) in harsh environments. Material and process tests have been performed with the purpose to find a material which would fulfill the reliability requirements for use e.g. in military or automotive applications. Seven polymer materials, i.e. four epoxies, two silicones and one polyurethane material have been selected and evaluated in the experiments. The most critical material and process parameters for glob-top have been identified and measured. Based on the experimental results, application-based scoring of studied epoxy materials has been performed. Material evaluation results have been summarized in conclusions about the most suitable glob-top material for use in harsh environments.

  • 330.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Thermal and thermo-mechanical analysis for design evaluation of an automotive radar module2004Inngår i: Quality and Reliability Engineering International, ISSN 0748-8017, E-ISSN 1099-1638, Vol. 20, nr 7, s. 709-726Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The influence of the substrate technology, assembly method, and housing material on the thermal, thermo-mechanical and cost performance of a radar module for automotive applications has been studied to address the product reliability aspects during the design phase. Flip chip and wire bonding have been evaluated for Multi-Chip Module—Laminate/Deposition (MCM-L/D) and Multi-Chip Module—Deposition (MCM-D) substrate technologies used for electronic packaging solutions in a harsh environment. Solder ball and direct attachment have been investigated as second-level assembly. As a result of thermal and thermo-mechanical simulations and cost analysis, radar module designs combining MCM-D and MCM-L/D with wire bonding have been revealed, which are preferable for use in different temperature environments with respect to two performance criteria, the maximum junction temperature and the manufacturing cost. Simulation-based guidelines have been developed for designing radar modules used in automotive applications while satisfying temperature and stress constraints provided for the module.

  • 331.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Törnvall, Magnus
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Application of simulation-based decision making in product development of an RF module2007Inngår i: Microelectronics and reliability, ISSN 0026-2714, E-ISSN 1872-941X, Vol. 47, nr 2-3, s. 302-309Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents results of simulation-based design evaluation for thermal and thermo-mechanical performance and cost of packaging technology of a RF module for automotive application. Combination of thermal, thermo-mechanical and cost analysis within the multi-attribute decision making enabled design ranking and revealed two MCM-L/D and MCM-D designs with wire bonding assembly preferred for use in automotive applications for different temperature environments. Simulation-based design guidelines were developed for designing electronic modules exhibiting good thermal and thermo-mechanical performance. By application-based partitioning of the importance weights assigned to the reliability and cost criteria, the guidelines were extended to cover other application areas.

  • 332.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Belov, Ilja
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Törnvall, Magnus
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Application of simulation-based decision making in product development of an RF module2004Inngår i: 5th IEEE conference in Thermal and Mechanical Simulation and Experiments in Micro-Electronics and Micro-Systems: EuroSimE 2004, 2004, s. 233-240Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents results of simulation-based design evaluation for thermal and thermo-mechanical performance and cost of packaging technology of an RF module for automotive applications. A combination of thermal, thermo-mechanical and cost analysis within the multi-attribute decision making framework enabled design ranking and revealed two MCM-L/D (multi-chip module-laminate/deposition) and MCM-D (deposition) designs with the wire bonding assembly preferred for use in automotive applications for different temperature environments. Simulation-based design guidelines were developed for designing electronic modules exhibiting good thermal and thermo-mechanical performance. By application-based partitioning of the importance weights assigned to the reliability and cost criteria, the guidelines were extended to cover other application areas.

  • 333.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik.
    Poder, R.
    SP Technical Research Institute of Sweden A/S, Copenhagen, Denmark.
    Methods for predicting corrosion on electronic products2014Inngår i: Corrosion Engineering, Science and Technology, ISSN 1478-422X, E-ISSN 1743-2782, Vol. 49, nr 7, s. 661-664Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Surface insulation resistance (SIR) measurements have become necessary to perform, especially due to the introduction of lead free solders. It has been reported that SIR and other test methods have to be used for evaluating the reliability of printed wiring boards. This paper presents an investigation on how the SIR test environment influences the test results. The factors varied were temperature and humidity. The temperature was varied between 40 and 85°C, and the relative humidity was varied between 60 and 85%. Furthermore, the influence of different types of process chemicals on SIR was evaluated. Seven lead free solder pastes, of which five were no-clean and two were water soluble, were compared. The influence of using conformal coating was also studied. These solder pastes were used to verify the developed method. A proper test method for SIR measurements is suggested in the paper, as well as a recommendation for use of conformal coating.

  • 334.
    Lindgren, Mats
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning - Ytteknik. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsområde Robusta inbyggda system.
    Tegehall, P-E.
    Factors influencing the surface insulation resistance2005Inngår i: IMAPS Nordic 2005: the IMAPS Nordic Annual Conference, Tönsberg, Norway, 2005 : 11-14 September 2005, 2005Konferansepaper (Fagfellevurdert)
  • 335.
    Lindrud, Lennart
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    Lindgren, Göran
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Maskinteknik.
    The influence of Mn on the microstructure and mechanical properties of Al-Si based alloys containing Fe2006Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Abstract

    The purpose of this research is to investigate the influence of Manganese (Mn) on cast aluminum alloys where a substantial amount of Iron (Fe) is included. Ductility and tensile strength need to be improved in recycled aluminum alloys where greater amounts of Fe are found. Fe is a common impurity and is known to be detrimental to mechanical properties and in order to neutralize the effects of Fe; modifiers such as Mn are added. In this investigation, attempts will be carried out aiming to find the optimal amount of Mn. Other related topics that will be discussed are whether there exists a Mn/Fe ratio which clearly modifies the harmful iron- rich phases and improves the properties for a certain alloy or not. Also, will the heat treatment have a significant effect on mechanical properties? These are some of the questions that will be answered in this paper.

    It is hard to find research articles that focus only on the influence of Mn on the microstructure and mechanical properties of Al-Si cast alloys. Much of the work that is already published concerns only a specific alloy and casting method. In this work three different casting processes, sand-, die- and high pressure die-casting, will be simulated by using gradient solidification equipment. Furthermore, the influence of heat treatment on the mechanical properties will be examined.

    The results showed that the solidification rate had the biggest impact on the microstructure and mechanical properties of the alloys, where the fastest cooling rate gave the best results. The effect of Mn seems to influence the samples with coarser microstructures significantly where it had time to modify the Iron-rich needles, also called the β-phase. At higher cooling rates the impact of Mn was impeded. It has been observed that a high content of Mn (around 0.6%) needs to be added before the properties start to improve. UTS (Ultimate Tensile Strength) and YS (Yield Strength) are improved while ductility is lowered. Heat treatment did not seem to have any influence on the effects of Mn.

  • 336.
    Liu, J.
    et al.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Tan, M. -J
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Aue-U-Lan, Y.
    Singapore Institute of Manufacturing Technology.
    Jarfors, A. E. W.
    Singapore Institute of Manufacturing Technology.
    Fong, K. -S
    Singapore Institute of Manufacturing Technology.
    Castagne, S.
    Singapore Institute of Manufacturing Technology.
    Superplastic-like forming of non-superplastic AA5083 combined with mechanical pre-forming2011Inngår i: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 52, nr 1-4, s. 123-129Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Superplastic forming has been considered as an attractive process in the automotive and aerospace industries. However, the disadvantages of slow forming rate, high-temperature requirement, poor thickness distribution, and expensive base material have hindered its widespread use for high production volume. In this paper, the non-superplastic grade of 5083 aluminum alloy (AA5083) sheets with thickness of 3 mm was employed in a superplastic-like forming process, which is a combination of drawing (mechanical pre-forming) and superplastic forming (blow forming). Experimental trials were conducted to verify the possibility of improving the forming rate and lowering the process temperature. The blank was firstly pre-formed during the mechanical pre-forming phase. As a result, some part of material along the flange area was introduced inside the deformation cavity in advance of the blow forming phase. Secondly, argon gas was applied on the sheet, which would be deformed to come into contact with the inner die surface at the end of pressure cycle. It took only 8 min for the blow forming phase, and the process achieved an almost fully formed part at 400°C. The minimum thickness occurred at the inward corners, and the maximum thinning of the formed part was 54%. Grain growth and cavitation were found from the microstructure observations.

  • 337.
    Liu, J.
    et al.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Tan, M. -J
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Castagne, S.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Aue-u-lan, Y.
    Singapore Institute of Manufacturing Technology.
    Fong, K. -S
    Singapore Institute of Manufacturing Technology.
    Jarfors, A. E. W.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Investigation of process parameters in superplastic forming of mechanical pre-formed sheet by FEM2010Inngår i: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 447-448, s. 437-441Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Conventional superplastic forming has been applied in automotive and aerospace industries for a few decades. Recently, superplastic forming combined with mechanical pre-forming process has been reported to be capable of forming non-superplastic AA5083 at 400°C to a surface expansion of 200 % [1]. In this paper, finite element modeling (FEM) was used to develop the combined forming process by using the non-superplastic material AA5083-O. The simulation follows the experimental sequence and was divided into two phases (mechanical pre-forming and superplastic forming). A conventional creep equation based on tensile test data was adopted as a material model for the simulation. The pressure cycle and forming time was simulated according to the actual process route. The thickness distributions obtained from simulation validated the capability of the model to be used for this case. The influence of different parameters, such as holder force, friction, and punch depth was investigated by comparing the final sheet thickness and level of material draw-in. It was found that the punch depth played a significant effect on the uniformity of thickness distribution, from which a more uniform formed part can be obtained by using the punch with higher depth during mechanical pre-forming phase. © (2010) Trans Tech Publications.

  • 338.
    Liu, J.
    et al.
    Sch. of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Tan, M. -J
    Sch. of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Castagne, S.
    Sch. of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Aue-U-Lan, Y.
    Singapore Institute of Manufacturing Technology.
    Jarfors, A. E. W.
    Singapore Institute of Manufacturing Technology.
    Fong, K. -S
    Singapore Institute of Manufacturing Technology.
    Bayraktar, E.
    Supmeca-Paris, Mechanical Engineering School, France.
    Finite element modeling of a non-isothermal superplastic-like forming process2010Inngår i: AIP Conference Proceedings, Paris, 2010, Vol. 1315, s. 377-382Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Conventional superplastic forming (SPF) has been modified to increase the productivity and reduce some of the drawbacks, such as high forming temperature and high percentage thinning, to suit the automotive industries. One of the modifications was to combine between the conventional SPF and the use of a mechanical preformed blank to form the non-superplastic grade aluminum alloy (AA5083-O). The requirement of high temperature usually results in microstructural defects during forming process. In this paper, finite element modeling was adopted to investigate the superplastic-like forming process using the non-isothermal heating system. In the simulation, two phases (mechanical pre-forming and gas blow for ming) of the process were conducted under different temperatures, where the material was mechanically drawn into the die cavity at 200°C in the first phase, and it formed with gas pressure applied at a global temperature increasing from 400°C to 500°C. Because of the non-isothermal heating of material, it was found that it had enough ductility to flow more easily in the specific zones (die corners and radius). Additionally, FEM results showed that a better formed part can be obtained by the increasing temperature forming, compared to the stable temperature phase. © 2010 American Institute of Physics.

  • 339.
    Liu, J.
    et al.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Tan, M. -J
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Jarfors, A. -E.-W.
    Singapore Institute of Manufacturing Technology.
    Aue-u-lan, Y.
    Singapore Institute of Manufacturing Technology.
    Castagne, S.
    School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
    Formability in AA5083 and AA6061 alloys for light weight applications2010Inngår i: Materials & Design, ISSN 0261-3069, Vol. 31, nr SUPPL. 1, s. S66-S70Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With recent development in the automotive and aerospace industries, the lightweight, yet inexpensive aluminum alloys are of great demand in industrial applications. In this paper, considering the limited applications in non-superplastic materials, two typical alloys of AA5083 and AA6061 were investigated and compared during high temperature tensile tests to study their formability. The results of tensile tests and microstructures were shown, which indicated the deformation properties under different conditions. Both alloys exhibited relatively weak strain hardening effects especially at relatively lower strain rates. Furthermore, the highest strain rate sensitivity index (m value) was obtained, and the peak of percent elongation-to-failure also coincided with the ranges of highest m value. The flow stress coupled with the dynamic grain growth was related with the temperatures and strain rates. The grains appeared to be coarser in the deformed samples. Cavitation and recrystallization have also been found as a result of strain rate and temperature. © 2009 Elsevier Ltd.

  • 340.
    Lora, Ruben
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Dynamic Coarsening of 3.31C-1.89Si Grey Cast Iron2011Rapport (Annet vitenskapelig)
  • 341.
    Lora, Ruben
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Elmquist, Lennart
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Solidification Study of Gray Cast Iron in a Resistance Furnace2011Inngår i: Key Engineering Materials, ISSN 1013-9826, Vol. 457, s. 108-113Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Solidification of hypoeutectic gray cast iron has been investigated in a resistance furnace. A cylindrical shaped sample with three thermocouples, two inside and one in the surrounding, was solidified and compared to samples quenched at different stages during the solidification interval. An additional sample in the series has been produced to reveal the primary grain structure using Direct Austempering After Solidification (DAAS) treatment. The present paper collect for the first time under the same experimental procedure the solidification of a hypoeutectic gray cast iron where both the growth of the primary and eutectic phase are observed. An increase of the secondary dendrite arm spacing (SDAS) was observed until the end of the solidification interval. A comparison of the measured solidified fractions of the phases with those predicted using Fourier Thermal Analyses evidenced the quenching effectiveness. The eutectic cell size is in agreement with the literature. The method presents good consistency.

  • 342.
    Lora, Ruben
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Fourlakidis, V
    Swerea Secast AB.
    Díaz de Aguilar, A
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Diószegi, Attila
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Characterization of the Primary Austenite Dendrite and Interdendritic Space in Lamellar Cast Iron2011Rapport (Annet vitenskapelig)
  • 343.
    Malakizadi, Amir
    et al.
    Chalmers Institute of Technology, Gothenburg, Sweden.
    Ghasemi, Rohollah
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Behring, Carsten
    Chalmers Institute of Technology, Gothenburg, Sweden.
    Olofsson, Jakob
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Jarfors, Anders E. W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Nyborg, Lars
    Chalmers Institute of Technology, Gothenburg, Sweden.
    Machinability of solid solution-strengthened compacted graphite iron: Influence of the microstructure, mechanical properties and cutting conditions on tool wear responseManuskript (preprint) (Annet vitenskapelig)
  • 344.
    Malakizadi, Amir
    et al.
    Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
    Ghasemi, Rohollah
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Behring, Carsten
    Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
    Olofsson, Jakob
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Nyborg, Lars
    Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
    Krajnik, Peter
    Chalmers University of Technology, Department of Industrial and Materials Science, Gothenburg, Sweden.
    Effects of workpiece microstructure, mechanical properties and machining conditions on tool wear when milling compacted graphite iron2018Inngår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 410-411, s. 190-201Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of the present study was to investigate the tool performance when machining compacted graphite iron (CGI) alloys. A comparison was made between solid solution strengthened CGI including various amounts of silicon (Si-CGI) and the pearlitic-ferritic CGI as a reference material. The emphasis was on examining the influence of microstructure and mechanical properties of the material on tool wear in face milling process. Machining experiments were performed on the engine-like test pieces comprised of solid solution strengthened CGI with three different silicon contents and the reference CGI alloy. The results showed up-to 50% lower flank wear when machining Si-CGI alloys, although with comparable hardness and tensile properties. In-depth analysis of the worn tool surfaces showed that the abrasion and adhesion were the dominant wear mechanisms for all investigated alloys. However, the better tool performance when machining Si-CGI alloys was mainly due to a lower amount of abrasive carbo-nitride particles and the suppression of pearlite formation in the investigated solid solution strengthened alloys.

  • 345.
    Manjunath, Tushar
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    Nixon, Nirmal
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Industriell produktutveckling, produktion och design.
    On the Possibility to Increase Maximum Operating Temperature (MOT) of Al 20%SiC Composites for Mechanical Properties2020Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The main objective of this project is to seek the possibility to increase the maximum temperature, to improve mechanical properties and also analyse the microstructure of Al-20%SiC composite by manipulating its transition metals using four different additions of Zr, Ni, Si, Ti, Mg, Mn, Cr, Fe and Cu and conduct tensile and compression test to find out the mechanical properties of the composite of Brake Discs at ambient and elevated temperatures as company’s requirements(AC Floby) the casting will be done using vertical high pressure die casting process at Jönköping University which is collaborated with AC Floby for the materials and machining. The tensile and compression tests were conducted at Jönköping University in accordance to standard ASTM B557M for standard tension test of metals at room temperature and ASTM E21 for the tensile test of metal at elevated temperature, ASTM E9 for compression test.

    The scope of this project is to obtain stronger brake discs that can withstand high temperature and loads, to reduce vehicle’s weight and emissions by using the Al-20%SiC alloy since it has low density, high thermal conductivity, good corrosion resistance, strength and wear property.

    This project is part of a large project which was done by the next group that handles with the possibility to increase the maximum operating temperature of Al-20%SiC alloys to obtain wear friction and thermal physical properties. Hence, this gives the opportunity to understand the mechanical properties and thermal physical properties of the same newly developed Al-20%SiC alloys that is shared with the other group to validate the outcome of compositions of alloy 1 and alloy2 used in the project and compare between the two alloys. The operating temperature will rise, and the alloy strength falls due to elevated temperature and other microstructure defects hence our aim is to make the properties of alloy sustain at elevated temperature and reduce coarsening and wear in Brake Discs. Hence, we initiated by narrowing down the additions into the metal matrix Aluminium by using Thermo calc software to study the effect of each element on the Aluminium and the binary phase diagram of each alloying element in aluminium primary matrix. And to determine the effect of reinforcing SiC particles that provides strength, tensile and compressive properties at elevated temperature and came up with the satisfying additions for the alloy which will be explained further below in the report. A validation of the alloy was carried out against the tensile and compression experimental results to evaluate the predictive and better properties of the newly developed alloy for brake discs by comparing with the alloy 1 and alloy 2 compositions.

     

  • 346.
    Manne, Akhil
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Hiregoudra, Pramod S
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Produktutveckling - Simulering och optimering.
    Modelling and Simulation of Mold filling in gravity casting of Aluminium and MMC alloys.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 347.
    Martínez-Lage, Carlos
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Influence of Titanium on Mechanical and Thermal Properties in Lamellar Cast Iron2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This work focuses on the thermal and mechanical properties of two highly hypoeutectic, two hypoeutectic and four hypereutectic grey cast iron with different titanium content are studied.

    In order to collect required experimental data, laser flash (LFA), differential scanning calorimeter (DSC), dilatometer and tensile test were performed.

    Micrographs from the polished specimens were captured and graphite fraction and morphology were studied through qualitative and quantitative measurements. Subsequently, the same samples were colour etched with picric acid in order to perform a qualitative analysis of the matrix.

    It was concluded that titanium has influence in the mechanical properties by improving the UTS value, besides it has a greater effect on the hypereutectic (increase 50% UTS value) than in hypoeutectic concentrations( increase 16%) and the highest UTS values is achieved in lowest carbon equivalent content.

    Concerning the influence of titanium on thermal properties, titanium has not any influence on the expansion coefficient, instead titanium has a negative influence on the thermal diffusivity and which value is greater the higher the carbon content in the concentration while in high titanium content samples the thermal diffusivity increases proportionally with the amount of graphite due to titanium influence, samples have D-type graphite.

    About graphite, it has been seen that concentrations with more than 0,4% of titanium content have D-type graphite and their graphite fraction increases proportionally with the amount of carbon equivalent. Besides concentrations with D-type graphite have best mechanical properties and worst thermal properties while concentrations with C-type graphite have the best thermal properties and the worst thermal properties.

    Regarding to the thermal conductivity, adding titanium on concentrations close to eutectic causes a worsening of thermal conductivity while adding 0,45% of titanium on the highly hypoeutectic concentration causes better thermal conductivity at high temperature than a hypoeutectic concentration.

  • 348.
    Matsushita, Taishi
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Saro, Albano Gómez
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Elmquist, Lennart
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    On Thermal Expansion and Density of CGI and SGI Cast Irons2015Inngår i: Metals, ISSN 2075-4701, Vol. 5, nr 2, s. 1000-1019, artikkel-id met5021000Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The thermal expansion and density of Compacted Graphite Iron (CGI) and Spheroidal Graphite Iron (SGI) were measured in the temperature range of 25–500 °C using push-rod type dilatometer. The coefficient of the thermal expansion (CTE) of cast iron can be expressed by the following equation: CTE = 1.38 × 10−5 + 5.38 × 10−8 N − 5.85 × 10−7 G + 1.85 × 10−8 T − 2.41 × 10−6 RP/F − 1.28 × 10−8 NG − 2.97 × 10−7 GRP/F + 4.65 × 10−9 TRP/F + 1.08 × 10−7 G2 − 4.80 × 10−11 T2 (N: Nodularity, G: Area fraction of graphite (%), T: Temperature (°C), RP/F: Pearlite/Ferrite ratio in the matrix).

  • 349.
    Matsushita, Taishi
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Saro, Albano Gómez
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Elmquist, Lennart
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Jarfors, Anders E. W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    On the specific heat and thermal diffusivity of CGI and SGI cast irons2017Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 30, nr 5, s. 276-282Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The specific heat and thermal diffusivity of Compacted Graphite Iron (CGI) and Spheroidal Graphite Iron (SGI) were measured at temperatures ranging between 373 and 773 K (100 and 500 °C) using differential scanning calorimetry (DSC) and between 298 and 773 K (25 and 500 °C) using the laser flash method, respectively. Specific heat increased with increasing amounts of graphite and pearlite, as well as with Si content. As a recommended value of the specific heat for fully ferritic high-silicon SGI, the following relation was suggested:(Formula presented.) where T is the temperature in Celsius, (Formula presented.) is the mass% of Si, and fg is the area fraction of graphite (%). The thermal diffusivity of cast irons tends to increase with increasing amounts of graphite, and decrease with greater nodularity. It was found that nodularity had a strong influence on thermal diffusivity in the nodularity range of 15–30%. 

  • 350.
    Matsushita, Taishi
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Saro, Albano Gómez
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Elmquist, Lennart
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    On the thermal conductivity of CGI and SGI cast irons2018Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 31, nr 3, s. 135-143Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The thermal conductivity of Compacted Graphite Iron (CGI) and spheroidal graphite iron (SGI) was established in the temperature range from room temperature up to 500 °C using the experimental thermal diffusivity, density and specific heat values. The influence of nodularity, graphite amount, silicon content and temperature on the thermal conductivity of fully ferritic high-silicon cast irons was investigated. It was found that the CGI materials showed higher thermal conductivity than the SGI materials. The thermal conductivity tended to increase with increasing temperature until it reached a maximum followed by a subsequent decrease as temperature was increased up to 500 °C. Conventional models were applied to estimate thermal conductivity and the predictive accuracy of each model was evaluated. The thermal conductivity could be estimated by the Helsing model. The Maxwell model, Bruggeman model and Hashin–Shtrikman model were also in fair agreement using the thermal conductivity value of graphite parallel to the basal planes in graphite. 

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