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  • 1.
    Abdollahifakhr, Hamon
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    Sengul, Ceyhun
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design.
    AUTOMATIC DESIGN OF WIRING PATTERN FOR CAR SEAT HEATERS2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This projects aims to develop design automation in product development. Design automation causes increase in producibility and decrease in product cost and manufacturing lead time.

    The study at hand is proposed to provide a new method and to introduce procedure to the design of wiring pattern for a car seat heater for Kongsberg Automotive, KA. KA is a Norwegian company and a global provider of engineering, design, and manufacture for seat comfort, driver and motion control systems, fluid assemblies, and industrial driver interface products. The method that currently is used in the company to create a wiring pattern is neither sufficient enough nor automated.

    In order to design the wiring pattern, at first procedure is handled by the designer. Secondly, car seat heater 2D layout is imported and then, the dimensions of the elements are defined as constraints. Then VBA codes are opened and the program is run. The result will be a wiring pattern in different 2D layouts. To make the design process easier, we have modeled five different layouts; wiring pattern of one element, two elements, three elements, five elements (with two back sides) and one element trapezoidal 2D layout.

    The algorithm written in VBA (Visual basic for application) creates the pattern according to the dimensions of the elements which are used as inputs to define constrained parameters. The created macros are simple to use and easy to modify, independent from the programming knowledge. The user is only responsible with parameter input and running the program. The solution gives wiring pattern for a car seat heater.

  • 2.
    Ahmadkhaniha, Donya
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Huang, Y.
    University of Southampton, Southampton, UK.
    Jaskari, M.
    University of Oulu, Nivala, Finland.
    Järvenpää, A.
    University of Oulu, Nivala, Finland.
    Heydarzadeh Sohi, M.
    University of Tehran, Tehran, Iran.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Karjalainen, L.P.
    University of Oulu, Oulu, Finland.
    Langdon, T.G.
    University of Southampton, Southampton, UK..
    Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg2017Conference paper (Refereed)
    Abstract [en]

    High-pressure torsion (HPT) processing was applied to cast pure Mg pieces and its effects on microstructure, hardness and tensile properties as well as corrosion resistance were evaluated. The microstructure of the processed samples was examined by electron backscatter diffraction (EBSD) and the mechanical properties were determined by microhardness and tensile tests. Corrosion resistance of the samples was studied via electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. The results showed that HPT refined the grain size of Mg very effectively from millimeters in the cast structure to a few micrometers homogeneously through the thickness and created a basal texture on the surface. One or five turns of HPT produced no significant difference in the grain size of the processed Mg but the hardness was a maximum after one turn. The yield strength of the cast Mg was increased by seven times whereas the corrosion resistance was not affected by the HPT processing.

  • 3.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    High speed machine metallic structures NFFP-344 WE 2.2.2002Report (Other academic)
  • 4.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Komponentteknologi.
    Structure and properties of thick plate and near surface properties after high speed machining af AA70102003Doctoral thesis, monograph (Other scientific)
  • 5.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Komponentteknologi.
    Structure and properties of thick plates of 70101998Licentiate thesis, monograph (Other scientific)
  • 6.
    Apelstedt, Kristoffer
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Dahl, Andreas
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Utveckling av motocrossadel2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
  • 7.
    Awe, Samuel A.
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting. Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Lee, Young C.
    Dahle, Arne
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
    Development of new Al-Cu-Si alloys for high temperature performance2017In: Advanced Materials Letters, ISSN 0976-3961, E-ISSN 0976-397X, Vol. 8, no 6, p. 695-701Article in journal (Refereed)
    Abstract [en]

    In a quest to develop new light metal alloys that can perform excellently at elevated-temperatures (from 300°C to 400°C), a ternary eutectic Al-Cu-Si alloy was exploited to gain a deeper understanding of the alloy system and its suitability for high temperature applications. The alloys studied, with chemical composition of Al-27%Cu-5%Si (by weight percent) with Ni addition in the range of 0 to 1.5%wt, were cast in a rapid solidification casting technique. The solidification characteristics of the alloy was studied using the Thermo-Calc software. Microstructures were characterized in a scanning electron microscope coupled with energy dispersive spectrometry (SEM-EDS). Finally, the elevated-temperatures tensile properties of the alloys were investigated. Comparing the microstructures and mechanical properties of these Al-Cu-Si(-Ni) alloys with conventional Al-Si alloy A319, the refined microstructure with dispersed Ni intermetallic particles formed in the as-cast Al-Cu-Si(-Ni) alloys deliver improved elevated temperature properties. In particular, the yield strength and ultimate tensile strength of the new alloy with 1.5% Ni at 400?C were observed to be 220% and 309% higher, respectively, than for conventional A319 alloy.

  • 8.
    Bagare, Vinay Shrinivas
    Jönköping University, School of Engineering, JTH, Product Development.
    Study on wear modelling using pilot jaw crusher2017Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    The crushers are used by mining and aggregate industries for crushing the rocks. Wear in these crushers wear parts causes a great wear loss and significant economic loss. This work aims to find the worn geometry, hardness and behavior of the wear parts as function of rock type.To perform this research, a series of tests such as scratch test, rock-crushing test, microstructural analysis and hardness test were carried out. From the scratch test, hardness test and microstructural analysis, wear mechanism and work hardening effects were studied using LOM, SEM and Vickers hardness measurement. The crushing test was carried out by crushing quartzite, diabase and gneiss rocks in a mini jaw crusher with respect to M1, M2 and M7 samples proposed by the company, which provides data to calculate volumetric loss, wear ratio and data for power consumption. The data collected from the experiments are used to create model to get a clear picture of the performance of each material with respect to different rock type.During pouring the rocks into the jaw crusher, several types of wear are expected to be occur, which substantially results in change of the geometry of the jaw crusher plates and hence the performance of the crusher will be affected. Controlling of such harsh wear situations requires introducing a material with high-performance wear resistance (particularly abrasion) and fundamentally modifying the operating conditions to minimize the risk of severe wear degradation. For this reason, it is desirable to simulate how the geometry and performance are changing due to wear.The results from the scratch test and microstructural analysis showed that at low applied loads severe plastic deformation is seen but as the load increases, the work hardening mechanism develops and provides wear resistance properties. The results from hardness test and modeling, M7 sample shows good wear resistance properties against hard and abrasive rocks which in this case is diabase and quartzite rocks, M2 sample shows good wear resistance against only quartzite rocks and gneiss rocks. M1 sample shows less volumetric loss against quartzite but when compared to M2 and M7’s mechanical property, M1 showed low wear resistance against all three rocks.

    Key words: Wear mechanism, work hardening, wear ratio, volumetric loss, power consumption, M1, M2, M7 samples, quartzite, diabase and gneiss rock.

  • 9.
    Cedersund, Elisabet
    et al.
    Jönköping University, School of Health Science, HHJ, Dep. of Behavioural Science and Social Work. Jönköping University, School of Health Science, HHJ. Quality improvements, innovations and leadership in health care and social work.
    Brunnberg, Elinor
    Att studera välfärd på nytt sätt2007In: Välfärdspolitik i praktiken: Om perspektiv och metoder i forskning, Uppsala: NSU Press , 2007, p. 7-19Chapter in book (Other (popular science, discussion, etc.))
  • 10.
    Ceschini, Lorella
    et al.
    University of Bologna, SMETEC Department.
    Boromei, Iuri
    Morri, Alessandro
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Microstructure, tensile and fatigue properties of the Al–10%Si–2%Cu alloy with different Fe and Mn content cast under controlled conditions2009In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 209, no 15-16, p. 5669-5679Article in journal (Refereed)
  • 11.
    Constantin, Therese
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Konceptframtagning av testinstrument för vattendetektion baserad på MIP2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Water is vital for all life on earth. But it can also be dangerous, even fatal, if it is polluted water. 60 percent of child mortality can directly be deduced to dirty water. Not only developing countries are affected, even in the western world epidemics are breaking out by partake or bathing in dirty/polluted water.

    MIP, Molecularly Imprinted Polymers, is a biosensor technology that can provide faster and more reliable response than the current methods of water analysis. It is also cheaper and due to that more samples can be taken and analyzed. These three variables can reduce the number of patients due to polluted water are detected faster and appoint of necessary measures can be done faster.

    This project searches for the design of an automated sample tool based on MIP techniques. The Concepts must express innovation, high quality and clarity. The instrument should be used both in laboratory and in the field.

    The project has resulted in one concept. The concept is based on the one construction of internal components that is as low height as possible (20 centimeters) and is slightly wider than its depth (40 vs. 30 centimeters). MIP-and NIP containers are located by one of the short side and the battery is near the edge of the front side. The placement is designed to facilitate the loading and exchange.

    The concept answers against all of the demands and two of three wishes.  Also the concept is designed after the further user. The further user has also been involved during the process of the concept design. The development of the concept start with the questions from the brainstorming “What will the user feel when they lay their eyes of the product/instrument and uses is?” The ides and thoughts were to ides sketches. They also used in the evaluation of the same sketches. The most exalting ides develop in to three concepts, and in evaluations, with help from further user, with kansei and discussions. The evaluation showed that one of the concepts was adaptable for further development.

    The concept is smooth and has areas for hold. The user is self looking and searching for the optimal hold. The instrument has none parts that extend from the body and can damage the user. The instruments components that the user need to exchange is placed in a box that by automatic shouts out. The aces to this I controlled by a touch screen. One the touch screen is a hand scanner that is used to lock and unlock the instrument. With a window the process of the analyses is showed. That rice the reliability, lift the functions, give a high-tech and a hero feeling and are fun for the users.

  • 12.
    Dissler, Per-Inge
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Lagerqvist, Simon
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Nyutveckling av Nålträdarsystem2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    This thesis work is performed on VSM Group Ltd in Huskvarna that produces sewing machines under the trademarks Pfaff and Husqvarna Viking. On these sewing machines is an application that helps the user to thread the needle. The aim with the work has been to study today's applications on VSM and their competitors' sewing machines in order to since developing a new Needle-threader that divides itself from all the ones used today. The objective with the work has been an entire new concept with an operational prototype.

    As a base the competitor analysis was used where today's applications was studied in order to identify positive and negative aspects of these. This led to a number off “concept families” where different variants off the same ideas were collected and evaluated. The choice fell on the concepts with air suction that was regarded as the most unique and viable.

    Different applications in order to create air suction were tested and the one with best results were chosen for a prototype.

    The final prototype sucks the thread through the needles eye, using a mouthpiece that is positioned behind the needle. The suction is created when a diaphragm pumps from the air from an airtight shell whose only opening is the mouthpiece.

    Of those concepts that have been tested in this thesis work it’s this solution that is most realistic to be used in future sewing machines.

  • 13.
    Eriksson, Magnus
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Karlsson, Felix
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Metallersättning inom byggbranschen2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    In this paper the possibilities to replace metal with plastic in products for the building industry were looked into. The first part was a market examination where several suitable products were found. After evaluation the door latch for in-house doors was selected to be re-designed to better suit the properties of plastic.

    New types of mechanisms were designed with different functions that use the benefits of plastic materials. Models of these mechanisms were developed to evaluate their function. The components in the different mechanisms were adapted for manufacturing with injection moulding.

    To confirm that the plastic material could handle the appearing stresses calculations on the most vulnerable parts were carried out. The result of the re-design process was three types of door latches that all fit in the doors standard cut-out. Model Classic is similar to the existing mechanism but the number of components is less than half and assembly and manufacturing is simplified. Model Magneto uses a magnet to move the locking part when the door is closed. Opening and locking is the same as Classic. Model Push/Pull uses a pushing or pulling motion to open the door depending on which side it is operated from.

  • 14.
    Hermansson, Erik
    et al.
    Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    Marcus, Ekberg
    Jönköping University, School of Health and Welfare, HHJ. Prosthetics and Orthotics.
    A material study of insoles: Manufactured using different methods2019Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    Aim: The aim of this study is to evaluate if additive manufacturing (AM) is an appropriate manufacturing method for insoles in comparison to vacuum forming (VF) and subtractive manufacturing (SM) in regards of material properties such as abrasion resistance. Background: Traditionally insoles are manufactured with either VF or SM. AM has been around for some decades but implementation into orthotic and prosthetic (O&P) business has not been accomplished yet. Therefore, the quality of the products produced with AM must be tested in comparison with traditional methods. Method: A comparison of samples for the mentioned manufacturing methods was done with the help of an abrasion testing machine with the standard ASTM G133. Two samples were produced from each manufacturing method and respectively tested for one and two hours. All the samples were weighed before and after the tests with the help of a four decimal scale. The difference in weight before and after the test and coefficient of friction was evaluated. The weight difference was analyzed to see how much material had been removed from the sample. The percentage of wear loss was calculated for each specific sample, both for one hour and two hours of testing. No statistical analysis could be made due to the limited amount of samples and testing time. Result: No statistically significant could be found for either wear loss or the coefficient of friction as mentioned above. Conclusion: A conclusion whether which material having the best abrasion resistance for respectively manufacturing method could not be drawn due to limited results. This study can be seen as a pilot study where the methodology can be used in further studies. Further research on AM needs to be conducted.

  • 15.
    Kasvayee, Keivan Amiri
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Ciavatta, Matteo
    University of Bologna, Bologna, Italy.
    Ghassemali, Ehsan
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Effect of Boron and Cross-Section Thickness on Microstructure and Mechanical Properties of Ductile Iron2018In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 925, p. 249-256Article in journal (Refereed)
    Abstract [en]

    Eeffect of Boron addition on the microstructure and mechanical properties of ductile iron, GJS-500-7 grade was studied. Three cast batches with the Boron content of 10, 49 and 131ppm were cast in a casting geometry containing plates with thicknesses of 7, 15, 30, 50 and 75mm. Microstructure analysis, tensile test, and hardness test were performed on the samples which were machined from the casting plates. Addition of 49 ppm Boron decreased pearlite fraction by an average of 34±6% in all the cast plates. However, minor changes were observed in the pearlite fraction by increasing Boron from 49 to 131 ppm. Variation in the plate thickness did not affect the pearlite fraction. The 0.2% offset yield and ultimate tensile strength was decreased by an average of 11±1% and 18±2%, respectively. Addition of 49 ppm Boron decreased Brinell hardness by 16±1%, while 11±2% reduction was obtained by addition of 131ppm Boron.

  • 16.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    EAST – European Academy of Surface Technology2015In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, Vol. 93, no 6, p. 281-Article in journal (Refereed)
  • 17.
    Leisner, Peter
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Elektroplätering av antibakteriella beläggningar2015In: Ytforum, ISSN 0349-4470, no 1, p. 23-Article in journal (Other (popular science, discussion, etc.))
  • 18.
    Olofsson, Jakob
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Cenni, Riccardo
    Università degli Studi di Modena e Reggio Emilia, Italy.
    Cova, Matteo
    Università degli Studi di Modena e Reggio Emilia, Italy.
    Bertuzzi, Giacomo
    Zanardi Fonderie, Italy.
    Salomonsson, Kent
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization.
    Johansson, Joel
    Jönköping University, School of Engineering, JTH, Product Development. Jönköping University, School of Engineering, JTH. Research area Product Development - Computer supported engineering design.
    Multidisciplinary shape optimization of ductile iron castings byconsidering local microstructure and material behaviour2017In: WCSMO12, 12th World Congress of Structural and Multidisciplinary Optimisation: Book of Abstracts / [ed] Kai-Uwe Bletzinger, Sierk Fiebig, Kurt Maute, Axel Schumacher, Thomas Vietor, Technische Universität , 2017, p. 82-Conference paper (Refereed)
    Abstract [en]

    During the casting process and solidification of ductile iron castings, a heterogeneous microstructure is formed throughout the casting. This distribution is highly controlled by process related factors, as chemical composition, local solidification conditions, and the geometry of the casting. Geometrical changes to the geometry of the casting thus alters the local mechanical behaviour, as well as the distribution of stresses and strains when the casting is subjected to load. In order to find an optimal geometry, e.g. with reduced weight and increased load-bearing capacity, this interdependency between geometry and local material behaviour needs to be considered and integrated into the optimization method. In this contribution, recent developments in the multidisciplinary integration of casting process simulation, solidification and microstructure modelling, microstructure-based material characterization, Finite Element Analyses (FEA) with local material behaviour and structural optimization techniques are presented and discussed. The effect and relevance of considering the local material behaviour in shape optimization of ductile iron castings is discussed and evidenced by an industrial application. It is shown that by adopting a multidisciplinary optimization approach by integration of casting simulation and local material behaviour into shape optimization, the potential of the casting process to obtain components with high performance and reliability can be enabled and utilized.

  • 19.
    Rossi, S.
    et al.
    University of Trento.
    Parziani, N.
    University of Trento.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. University of Trento and SP Technical Research Institute of Sweden.
    Abrasion resistance of vitreous enamel coatings in function of frit composition and particles presence2015In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 332-333, p. 702-709Article in journal (Refereed)
    Abstract [en]

    Vitreous enamel is an inorganic coating applied on metallic substrates as powder and fired at relatively high temperature in order to cover the surface forming the coating. This kind of layer shows, at the same time, very good functional and aesthetical properties. In several applications, good mechanical resistance together with corrosion protection is required and enamel is a good alternative to other coatings. Enamel presents optimum corrosion protection and high hardness values but the low fracture toughness reduces its resistance to abrasive wear related to brittle fracture. The microstructure of enamel, the chemical composition of the frit, and the deposition parameters are crucial for the final properties. Moreover, it is possible to introduce mill additives in the frit or hard particles inside the layers to improve final resistance. In this paper, abrasion resistance of enamel is tested by Taber Abraser test. Mill additives (spodumene or quartz), hard (WC or SiC) or solid lubricant (graphite) particles have been added to the frit to study their influence on the abrasion resistance. The abrasion resistance of modified enamels was evaluated through mass loss after abrasion and wear track were observed by SEM in order to evaluate the abrasion damage. An improvement of the abrasion resistance was obtained modifying the frit with mill additives. The introduction of SiC and WC particles produced an important modification in wear mechanism of the glassy coating, reducing the crack nucleation due to the low pores quantity and good interface between vitreous matrix and particles. In these cases the wear mechanism is limited to scratches on the surface.

  • 20.
    Sarius, N.G.
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Hald, J.
    Hultman, L.
    Linköping University.
    Electroplating of nickel in grooves under the influence of low and medium frequency ultrasound2011In: Journal for Electrochemistry and Plating Technology, ISSN 1866-7406, Vol. 1, no 3, p. 19-28Article in journal (Refereed)
    Abstract [en]

    The effect of ultrasonics on filling properties has been studied by Ni electroplating from a sulphamate electrolyte in high aspect ratio grooves. The experiments have been performed with two different modes of ultrasound: a) 25 kHz ultrasound with an effect of 225 W directed perpendicular to the substrate surface; b) ultrasonic standing waves of 100 kHz and 400 kHz parallel to the substrate surface. It was found that both methods improve the filling in grooves that are between 0.35 and 1 mm wide with aspect ratios between 0.6 and 3, compared to electroplating with conventional agitation. Under the investigated conditions the 400 kHz standing wave parallel to the surface was most efficient to improve filling of grooves.

  • 21.
    Sarius, N.G.
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Leisner, Peter
    Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
    Persson, P.
    Hald, J.
    Hultman, L.
    Influence of ultrasound and cathode rotation on the formation of intrinsic stress in Ni films during electrodeposition2011In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 89, no 3, p. 137-142Article in journal (Refereed)
    Abstract [en]

    The influence of 25 kHz ultrasound and cathode rotation during electroplating of Ni films on Si wafers has been studied with respect to intrinsic stress formation. Current densities from 1·6 up to 28·3 A dm−2 were used in an additive free Ni sulphamate electrolyte. In general, more efficient agitation by either ultrasound or cathode rotation was found to reduce intrinsic stress towards compressive levels compared with conventional agitation with an electrolyte circulation pump. Furthermore, intrinsic stresses become less dependent on changes in current density. The latter effect is most pronounced for ultrasonic agitation. Structure analysis of samples deposited by ultrasonic agitation shows dense deposits with initially smaller grains at high ultrasonic effect. Locally increased temperature at the substrate surface could be an important effect of ultrasound agitation.

  • 22.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Component Technology.
    Johansson, Sten
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Component Technology.
    The influence of cooling rate and manganese content on the beta Al5FeSi phase formation and mechanical properties of Al-Si based alloys2008In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 490, no 1-2, p. 385-390Article in journal (Refereed)
  • 23.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Sjögren, Torsten
    SP Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    SP Sveriges Tekniska Forskningsinstitut.
    Inverkan av porer på mekaniska egenskaper i gjutna aluminiumkomponenter2009In: Gjuteriet, ISSN 0017-0682, Vol. 99, no 5, p. 20-23Article in journal (Other (popular science, discussion, etc.))
  • 24.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Sjögren, Torsten
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    The Influence of Al5FeSi on the Tensile Properties of a HPDC Cast Aluminium Alloy: Potential and Outcome in a Casting2004In: The High Tech Die Casting International Conference, Brescia, Italy, 21st-22nd April 2004, 2004, p. 10-Conference paper (Other academic)
  • 25.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Prediction of mechanical properties of cast aluminium components at various iron contents2010In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 31, no Supplement 1, p. S6-S12Article in journal (Refereed)
    Abstract [en]

    The simulation of microstructure and mechanical properties is of great importance as a lead in bringing the foundry process and cast materials closer to the casting designer. Prediction of the formation of the microstructure during solidification is a supporting factor for strength optimization of cast aluminium components that allows an improved performance and increased competitiveness of cast engineering components.

    The deformation behaviour and the integrity of cast components depends mostly on the chemical composition of the material, especially the iron content, solidification behaviour and the resulting microstructural characteristics. This paper aims to demonstrate the capabilities of microstructure and mechanical properties modelling of aluminium cast materials and components. The validation of the models includes investigation of cast cylinder head and measured microstructure and mechanical properties as well as their distributions. The effect of iron-rich compound’s morphology and fraction on the plastic deformation behaviour has been studied and modelled in terms of strain hardening exponent and strength coefficient. This approach enables the prediction of local microstructure and mechanical properties. The developed models have been implemented in a cast simulation software for simulation of the cast cylinder head.

    The model predictions of microstructural quantities and mechanical properties are in good agreement with experimental measurements.

  • 26.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering. Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting.
    Att förutsäga variationer i egenskaper hos gjutna aluminiumkomponenter2009In: Gjuteriet, ISSN 0017-0682, Vol. 99, no 3, p. 8-10Article in journal (Other (popular science, discussion, etc.))
  • 27.
    Seifeddine, Salem
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Prediction of mechanical properties of cast aluminium components at various iron contents2009In: 5th International Conference on Materials for Advanced Technologies, 2009Conference paper (Other academic)
  • 28.
    Sjögren, Torsten
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Modelling the Effect of Graphite Morphology on the Deformation Behaviour of Cast Irons2006In: Eighth International Symposium on Science and Processing of Cast Iron, SPCI8, October 16-19, Beijing, China, 2006, p. 5-Conference paper (Other academic)
  • 29.
    Sjögren, Torsten
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Wessén, Magnus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Svensson, Ingvar L.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Wilfried, Schäfer
    Modeling and Simulation of Elastic Properties in Cast Compacted Graphite Iron Engine Block2006In: Modeling of casting, welding, and advanced solidification: Proceedings from the Eleventh International Conference on Modeling of Casting, Welding and Advanced Solidification Processes; Opio; France; 28 May-2 June 2006, Warrendale, Pa.: TMS-Minerals, Metals & Materials Society , 2006, p. 685-692Conference paper (Refereed)
  • 30.
    Sjögren, Torsten
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Wigren, Per
    Vilhelmsson, Fredrik
    Vomacka, Peter
    High Performance Piston Rings for Two-Stroke Marine Diesel Engines2004In: 24th CIMAC World Congress on Combustion Engine Technology, June 7-11, Kyoto, Japan, 2004, p. 11-Conference paper (Refereed)
  • 31.
    Sjölander, Emma
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Optimisation of solution treatment of cast Al–Si–Cu alloys2010In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 31, no suppl. 1, p. 44-49Article in journal (Refereed)
    Abstract [en]

    The influence of solidification rate on the solution treatment response for an Al–8Si–3.1Cu alloy has been investigated. The alloy was cast using the gradient solidification technique to produce samples with three different solidification rates. The samples were solution treated at 495 C for various times between 10 min and 10 h. The concentration of copper in the matrix was measured using the wavelength dispersive spectroscopy technique, WDS.

    The results show that the coarseness of the microstructure clearly affects the solution treatment time needed to dissolve particles and obtain a homogenous distribution of copper in the matrix. A short solution treatment time of 10 min is enough to achieve a high and homogenous copper concentration for a material with a fine microstructure (secondary dendrite arm spacing, SDAS of 10 μm), while more than 10 h is needed for a coarse microstructure (SDAS of 50 μm). A model was developed to describe the dissolution and homogenisation process. The model shows good agreement with the experimental results.

  • 32.
    Sjölander, Emma
    et al.
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    The heat treatment of Al–Si–Cu–Mg casting alloys2010In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 210, no 10, p. 1249-1259Article in journal (Refereed)
    Abstract [en]

    Heat treatment of gravity cast aluminium components normally involve a solution heat treatment followed by quenching and subsequent ageing, either naturally or artificially. The mechanical properties of aluminium castings containing Cu and Mg are clearly improved by heat treatment but there are still some uncertainties and contradictions about the phase dissolution, formation of precipitates and the influence of natural and artificial ageing parameters such as time and temperature, on the peak strength of these materials. The present paper reviews over 60 papers in attempt to clarify and map out the influence of each and every sequence that is involved in the heat treatment process on the evolution and kind of precipitates, which in turn determines the mechanical properties of cast aluminium components.

  • 33. Stoffers, Marcus
    et al.
    Johansson, Linus
    Prioriterad sätesuppvärmning till fordonsindustrin2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 34.
    Strandberg, Marcus
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Determination and implementation of polymer parameters into simulations of the twin-screw extrusion process.2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis was conducted in cooperation with a Swedish company that develops and manufactures plastic compounds. An increasing need for identifying material properties is seen within the industry in order to predict the outcome of the extrusion process by using simulations. The purpose of this study was to expand a material database with the results obtained through various measurements of the material parameters in order to enable simulations. The numerical descriptions would be analyzed and validated in relation to the obtained results and conducted methods to enable implementation of the material data into the industry. In order to fulfill the purpose, scientific methods was applied by chosen literature studies, research approaches and experimental research. Machine tests were conducted to collect relevant output data that was compared with the results obtained during the simulation process where the experimentally determined material parameters were applied in a material database. Typical injection molding qualities of PET, POM, PC/ABS, SAN and PA66 has been investigated by conducting measurement methods described by standards of the melt flow rate, specific heats, viscosity, crystallinity and melt- and glass transition temperatures. With exception of the viscosity, the material parameters are considered to have high external validity and high reliability and can be implemented into the industry. The bulk- and melt density was determined by adapted methods that need further investigations. The external validity is reduced until these methods and measurements have been validated. The determined material parameters proved to be able to generate reliable simulation results that indicate of how the extrusion process will turn out based on the output values investigated. The data obtained through machine tests was compared with the results that were achieved through simulations and deviated at most 10.9% from the actual outcomes. The viscosity is considered to be the main factor that affects the differences of the output data between the machine tests and the simulation results. 

  • 35.
    Wikedzi, Alphonce
    et al.
    Luleå University of Technology, Sweden.
    Awe, Samuel A.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Luleå University of Technology, Sweden.
    Selective Extraction of Antimony and Arsenic from Decopperization Slime Using Experimental Design2017In: Journal of sustainable metallurgy, ISSN 2199-3823, Vol. 3, no 2, p. 362-374Article in journal (Refereed)
    Abstract [en]

    The aim of the present study is to selectively extract antimony and arsenic from decopperization slime through alkaline sulfide hydrometallurgy with a view to recycle the obtained solid residue within the copper smelter, and also regenerate the sulfide lixiviant during the process. Rechtschaffner experimental design was used to evaluate the joint influence of several experimental parameters such as leaching temperature, Na2S concentration, solid concentration, and reaction time on the extraction of antimony and arsenic from the material. The most active parameters influencing the extraction of the metals are solid concentration and reaction period. In addition, the results show that solid concentration interacted strongly with the leaching time and slightly with reaction temperature, which is an indication that solid concentration is the predominant influencing factor in removing antimony and arsenic from the material. It is also indicated from the results that about 95% Sb and 89% As were extracted when 50 g/L of the decopperization slime was dissolved in alkaline sulfide lixiviant containing 200 g/ L Na2S ? 20 g/L NaOH at 60 C for 24 h. Moreover, analysis of the leach residue reveals that copper sulfide and lead sulfide remain as the main constituents of the residue. The bismuth-containing mineral phase was not observed in the residue because of its low concentration, and also the Sb/As-bearing mineral phases were not detected due to the selectivity of the leaching reagent to the metals. Based on the experimental results from this investigation, a process flowsheet for the alkaline sulfide treatment of a decopperization slime was proposed with a view to eliminating its antimony and arsenic contents in a sustainable manner.

  • 36.
    Wikedzi, Alphonce
    et al.
    University of Dar es Salaam, Tanzania.
    Sandström, Åke
    Luleå University of Technology, Sweden.
    Awe, Samuel A.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Luleå University of Technology, Sweden.
    Recovery of antimony compounds from alkaline sulphide leachates2016In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 152, p. 26-35Article in journal (Refereed)
    Abstract [en]

    In copper metallurgy, antimony impurities usually form alloys and compounds with the transition metals to make up the basic building blocks of a speiss phase. This speiss phase is generally rich in copper and precious metals, which are desirable to recycle and recover at the smelter. The presence of this impurity unfortunately creates a build-up of this metal in the copper circuit, leading to problems during copper refining processes. Therefore, a removal or reduction of the antimony impurity to an acceptable level is a necessary step before the speiss can be recycled at the smelter for the recovery of its valuable metals. A lead silicate slag that was obtained after smelting a copper speiss admixed with silica, soda and lead oxide, was leached in alkaline sulphide solution to selectively dissolve its antimony content. Furthermore, the pregnant sulphide leachate was purified by precipitation and crystallization techniques to recover antimony as sodium thioantimonate and sodium hydroxyl antimonate using synthetic Na2S-NaOH-Sb2S3 solutions. The leaching results indicate that the highest amount of antimony and arsenic extracted from the material after 24 h at 100 °C and reagent concentration of 30 g/L NaOH + 30 g/L S2− was 83% and 90%, respectively. In the precipitation process, the addition of hydrogen peroxide to the alkaline sulphide leachate prompts the precipitation of antimony as NaSb(OH)6. The result also implies that b100% of stoichiometric hydrogen peroxide is required to completely oxidize the total amounts of both Sb3+ and S2− in the solution and to quantitatively precipitate N90% of the antimony in solution. The influence of catalytic agents and temperature on the process was not clearly reflected in this investigation due to the exothermic reaction with hydrogen peroxide. Moreover, the addition of elemental sulphur to the sulphide leachate also in- fluences the precipitation of antimony as sodium thioantimonate.

1 - 36 of 36
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