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  • 301.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Berglund, L A
    In-situ observations of fracture mechanisms for radial cracks in wood2000Ingår i: Journal of materials Science, 35, 2000, pp 6277-6283Artikel i tidskrift (Refereegranskat)
  • 302.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Gamstedt, E K
    Ahlgren, P
    Distribution of Strain to failure of single wood pulp fibres2001Ingår i: Nordic Pulp & Paper Research Journal 16 2001 pp 46-56Artikel i tidskrift (Refereegranskat)
  • 303.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Jernkvist, L O
    Gunnars, J
    Influence of repetitive stiffness variation on crack growth behavior in wood2000Ingår i: Journal of Materials Science, 35, 2000, pp 6259-6266Artikel i tidskrift (Refereegranskat)
  • 304.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Kifetew, Girma
    Berglund, L A
    Modelling of cell wall drying stresses in wood2002Ingår i: Wood Science and Technology 36 2002 pp 241-254Artikel i tidskrift (Refereegranskat)
  • 305.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Sjödahl, M
    Berglund, L A
    Measurements of crack tip strain field in wood at the scale of growth rings2000Ingår i: Journal of Materials Science, 35, 2000, pp 6267-6275Artikel i tidskrift (Refereegranskat)
  • 306.
    Thuvander, Fredrik
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Wallström, L
    Berglund, L A
    Lindberg, K A H
    Effects of an impregnation procedure for prevention of wood cell wall damage due to drying2001Ingår i: Wood science and Technology 34 2001 pp 473-480Artikel i tidskrift (Refereegranskat)
  • 307.
    Tofique, Muhammad Waqas
    et al.
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap.
    Burman, Christer
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik.
    Hallbäck, Nils
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap.
    Gåård, Anders
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Fatigue strength, crack initiation, and localized plastic fatigue damage in VHCF of duplex stainless steels2016Ingår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, nr 7, s. 899-910Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The fatigue strength of two-duplex stainless steel grades, 2304 SRG and LDX 2101, with austenitic–ferritic microstructure is tested using ultrasonic fatigue testing equipment operating at 20 kHz. The testing is conducted in tension-compression mode with the load ratio R=-1. The fatigue strength is evaluated at 107, 108, and 109 load cycles and the estimates of fatigue strength are higher for the LDX 2101 grade. The fatigue crack initiation mechanisms are analyzed using a scanning electron microscope. The fatigue cracks, in all cases, appear to initiate due to accumulation of plastic fatigue damage at the surface. In the 2304 SRG grade, accumulation of fatigue damage occurs at the external surface of fatigued specimens in the form of extrusions at the grain/phase boundaries and in the form of individual slip lines in the austenite phase. Meanwhile, in the LDX 2101 grade accumulation of plastic fatigue damage in the form of extrusions and intrusions occurs mainly within the ferrite grain. When the crack is microstructurally short, the crack growth appears to be crystallographic in nature and the crack appears to change its direction propagating from one grain into another.

  • 308. Velay, V
    et al.
    Persson, A
    Bernhart, G
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Penazzi, L
    thermal fatigue of a tool steel: experiment and numerical simulation2002Ingår i: / [ed] J Bergström, G Fredriksson, M Johansson, O Kotik, F Thuvander, 2002Konferensbidrag (Refereegranskat)
  • 309.
    Vestlund, Johnny
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Shatter free shell body for warhead: Concept study2013Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Future warheads face not only performance-, environmental- and environmental resistance requirements but are also facing requirements to reduce collateral damage on impact. This report is a concept study on the development of shatter free shell bodies for warheads carried out at Saab Dynamics AB. Focus of the concept study was identifying alternative materials for use in the warhead casing, identifying manufacturing processes useable in the production of casings of selected materials, identifying possible suppliers both in Sweden and abroad, as well as calculating an indication of manufacturing cost for both prototype and series manufacturing.

    A pre-study was carried out before initiating the concept study, studying earlier research performed within the field and retrieving basic knowledge of warhead component configuration and functionality, followed by establishing a requirement specification to be used for evaluation purposes during the concept study.

    Concept study material evaluation concluded the use of a fibre strengthened polymer matrix composites to achieve desired final properties of the component. Important factors for alternative materials ability to achieve required mechanical properties were found to be the need for high fibre volume content, long fibre reinforcements as well as the need for possibility of orienting fibre direction in order to accommodate applied stresses.

    An evaluation was executed of applicable manufacturing methods ability to attain good values of selected material factors, derived from the material evaluation; as well as an assessment of set methods repeatability, potential for automation and relative laminate quality. Combined with estimation of prime and sales cost resulted in the recommended use of filament winding using a thermoset polymer matrix.

    Combining process factors of the selected manufacturing method with remaining material alternatives resulted in further delimitation of materials and a final material recommendation.

    Subsequently threading integrity was evaluated for selected concept solution due to that only unfavourable fibre orientation in the section being possible. This resulted in the need of minor dimension changes to avoid stripping of threads during firing sequence. Estimated required dimensional change was assessed as acceptable but would however need be evaluated in future development.

    Final recommendation for future development is to commence testing of shell body composed of filament winded carbon epoxy composite. Estimated required dimensional changes is an increase slipping groove radius from 0,3 mm to 1,5 mm and an increase of thread length by 6 mm.

  • 310.
    W. Lindvall, Fredrik
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    On tool steel, surface preparation, contact geometry and wear in sheet metal forming2011Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In sheet metal forming operations the life length of the production equipment islargely dependent on the wear of the tools that are in direct contact with the sheet.One form of adhesive wear where some sheet material gets transferred to the tool, alsoknown as galling, is the most common cause of tool failure. The transferred materialsticks firmly to the tool and will scratch subsequent sheets and increase friction, renderingthem anywhere from aesthetically unsightly to completely ripped apart. Withcareful combination of several parameters the tools production life can be significantlyextended. The surface preparation of the tools has a large influence on the tool life, thesurface has to be smooth and yet not without texture. It was shown in strip reductiontesting that the orientation as well as the depth of the surface texture left by polishinginfluenced the tool life and that a texture perpendicular to the sliding direction was toprefer. The geometry of the forming tool is also a parameter to take into account as itinfluences the tool life not only by changing the contact pressure but also in itself. Ina sliding against flat sheet test rig a lower contact pressure increased the sliding distanceto galling. When two different geometries were compared at the same contactpressure it was found that there was a difference in tool life. As to the tool itself thematerial it’s made of influences the wear rate and tool life. Different tool steels wasinvestigated in sliding wear against metal sheets; Vancron 40 performed better thanVanadis 6 and S290PM performed better than a AISI M2 grade steel.

  • 311.
    W. Lindvall, Fredrik
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Assessment of galling performance of tools steel andsheets metals used in formingManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    A number of tool steel and sheet metal combinations were tested with respect to gallingbehaviour. Tests were performed both in dry and lubricated sliding. The tested sheet gradeswere three carbon steels, Docol 1200 M, Docol 1000 DP and DC01 two stainless steels,EN 1.4301 and EN 1.4509 one aluminium grade, AA 1193 and one titanium grade ti6al4vor EN 3.7164. The tool steels were two high speed steels and three powder metallurgicaltool steel grades.It was found that the tool steels performed equally well on dry sheets and the gradescould not be adequately separated. Under lubricated sliding on the Docol 1200 M sheetsthe difference between two PM materials was however notable.The addition of lubrication increased the tool life significantly for all materials excepttitanium. Titanium showed signs of galling immediately even if the sheets were lubricated.

  • 312.
    W. Lindvall, Fredrik
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Hogmark, Sture
    Uppsala Universitet.
    Study of the interface between adhered sheet metaland tool steel subjected to adhesive wearManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Many products used every day have at least some parts manufactured by sheet metal forming.Sheet metal forming is well suited for mass production and many machines perform aforming step in a matter of seconds. A common and severe form of wear is called gallingand occurs as small amounts of the sheet material is transferred on to the tool.In the present study the interface between three different sheet materials and a powdermetallurgical tool steel was investigated based on morphology and chemical composition.The sheets used were a high strength carbon steel sheet CS, a stainless steel grade, SS andtitanium, Ti. The tool steel, Vancron 40, was selected based on previously shown resistanceto galling. The microstructure of the tool steel contains three major constituents, the steelmatrix, M6C carbides and MCN carbonitrides, each constituent with potentially differentadhesive properties.To investigate the interfaces between the tool and the adhered material cross sectionlamellas was cut using a focused ion beam and studied in a transmission electron microscope.The chemical compositions of the interfaces were also investigated using electronenergy-loss spectroscopyThe presence of an interlayer between the tool and the adhered material would be ofhigh interest as the adhesion in the interface governs galling. The study did not reveal anyinterlayer between tool constituents and adhered material, for Vancron 40 worn against CSand SS but for one combination. SS sheet showed a ≃ 10 nm morphological interlayeragainst a MCN carbonitride. The lubricant was removed from the contact area and no traceof it was left in the interface between tool and adhered sheet. This shows that adhesive wearoccurs during direct tool to sheet contact comparative to dry sliding in SOFS tests.

  • 313.
    W. Lindvall, Fredrik
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Ekengren, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    FE calculations of contact conditions of a doublecurved disc pressed and slid against a metal sheetManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Many products are manufactured using sheet metal forming, as it has a high productionrate and a low cost when producing large series. However wear of sheet metal formingtools in the form of galling can severely limit the production. The sliding-on-flat-surfacewear tester, SOFS, has been used to reproduce the wear process leading up to galling in alaboratory environment.The contact conditions of the SOFS wear tester were investigated by several differentFE models. The contact conditions during static loading were accurately and preciselypredicted for the contact geometry found in the Sliding on flat surface wear tester. Thepressures were validated against the analytical Hertzian solution. During sliding the contactgeometry was shown to change predictably into a semi elliptical shape. At high friction, = 0.6, the contact pressure distribution changed to be heavier in the front and to the sides,leaving a slightly lower pressure in the center of the contact.An attempt was also made to model a sheet with surface roughness as measures byan optical profilometer. The attempt was successful in that a working FE model could becreated but there still remains work before the model con be used to accurately predict thecontact conditions. The model showed the formation of potential lubrication pockets on a

  • 314. Wahlstrom, T
    et al.
    Rakic, V
    Karlsson, H
    Thuvander, Fredrik
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Paper Surface Centre. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Predicting tensile properties of multilayer paperboards from properties of the layers2008Övrigt (Övrig (populärvetenskap, debatt, mm))
  • 315.
    Wang, Yu
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders2008Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In powder metallurgy research field, Direct Metal Laser Sintering (DMLS) and Metal Powder Starch Consolidation (MPSC) are relatively new rapid forming techniques to fabricate complex and near net-shaped components. The working principles of DMLS are to melt and fuse metal powder layer by layer in computer controlled systems to pile up components like three dimensional printing. It has been for instance extensively used for mould inserts, die parts, and functional metal prototypes. Another, less explored method, starch consolidation is a pressureless direct casting method which consists principally of mixing powder slurry, casting into moulds, consolidation, drying, and sintering. With a strong focus on both methods, the study here combines several strong material technology sectors; powder, rapid forming, mechanical property testing and surface technology. It covers the processing chain from green body preparation, optimization of

    sintering, nitriding, post sinter heat treatment, to modeling and assessment of material behaviour for end-user applications. An iron based powder and a high vanadium high speed steel powder with low and high carbon contents were used in the DMLS and MPSC processes, respectively. The overall aim of the study is to synthesize near net-shaped powder-based components, to characterize pores and microstructure, and to establish a fundamental understanding of failure mechanisms of powder based materials in bending fatigue, thermal fatigue and wear.

    The study showed the DMLS and MPSC technologies could produce shaped components with a multi-phased structure, controllable nitriding depth and high relative densities in a range of 97 - 99.7 %. Materials' heterogeneity and porosity have detrimental influence on mechanical properties, especially on crack initiation and subsequent propagation.

  • 316. Wang, Yu
    et al.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Characterization and fatigue behaviour of a starch consolidated and sintered high speed steel2006Konferensbidrag (Refereegranskat)
  • 317. Wang, Yu
    et al.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Fatigue and microstructure of iron based sintered alloys2007Ingår i: Journal of Iron and Steel research, 2007, 14Artikel i tidskrift (Refereegranskat)
  • 318. Wang, Yu
    et al.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Room temperature and thermal fatigue behaviour f an iron-based laser sintered metal2006Konferensbidrag (Refereegranskat)
  • 319.
    Wang, Yu
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Borgström, Henrik
    Department of Materials Science and Engineering, Chalmers University of Technology.
    Characterization and bending fatigue behaviour of a starch consolidated high speed steel: as-sintered, sintered and tempered, and sintered and nitridedManuskript (Övrigt vetenskapligt)
  • 320.
    Wang, Yu
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Burman, Christer
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Thermal fatigue behavior of an iron-based laser sintered material2009Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 513-514, nr 15 july, s. 64-71Artikel i tidskrift (Refereegranskat)
  • 321.
    Wang, Yu
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Burman, Christer
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Thermal fatigue behaviour of an iron-based laser sintered material2009Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 513-514, s. 67-71Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Direct metal laser sintering is a rapid manufacturing technique to make intricate and near net-shaped parts. An iron-based laser sintered metal was studied to evaluate its thermal fatigue properties. The test was performed using cylindrical specimens in a high power induction heating system equipped with a laser strain gauge for a contactless surface strain measurement. Initiation of thermal fatigue cracks occurred preferentially at pores and layer interfaces, while propagation of cracks followed along phase boundaries and thin inter-dendritic phases and showed an inter-granular fracture. By using the fundamental Fourier equation for heat conduction, the temperature cycle was modeled and calculated. A thermo elastic ideal plastic model was used to deduce the thermal stress based on surface strain experimentally measured. Finally, the temperature distribution, thermal stresses and mechanical strains were discussed with respect to thermal fatigue damage.

  • 322.
    Wang, Yu
    et al.
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Bergström, Jens
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Gerth, Julia
    Uppsala University.
    Hogmark, Sture
    Uppsala University.
    Borgström, Henrik
    Chalmers University of Technology.
    Harlin, Peter
    Dalarna University.
    Microstructure, strentgth and wear of high speed steel in HIPed, HIPed + nitrided, and SC+nitrided conditionsManuskript (Övrigt vetenskapligt)
  • 323. Yadoitsev, Igor
    et al.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Yadroitsava, Ina
    Hierarchical design principles of selective laser melting for high quality metallic objects2015Ingår i: Additive manufacturing, ISSN 2214-8604, Vol. 7, s. 45-56Artikel i tidskrift (Refereegranskat)
  • 324. Yadroitsev, I
    et al.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Yadroitsava, I
    Selective laser melting of Ti6Al4V alloy for biomedical applications: Temperature monitoring and microstructural evolution2014Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 583, s. 404-409Artikel i tidskrift (Refereegranskat)
  • 325.
    Yadroitsev, I
    et al.
    Université de Lyon, France.
    Krakhmalev, Pavel
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Materialvetenskap. Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Yadroitsava, I
    Université de , France.
    Johansson, S
    Linköpings universitet.
    Smurov, I
    Université de Lyon.
    Energy input effect on morphology and microstructure of selective laser melting single track from metallic powder2013Ingår i: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 213, nr 4, s. 606-613Artikel i tidskrift (Refereegranskat)
  • 326.
    Yang, Zhenkun
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Alternatives to hard chromium plating on piston rods2011Självständigt arbete på avancerad nivå (masterexamen), 30 poäng / 45 hpStudentuppsats (Examensarbete)
  • 327.
    Åkefeldt, Jon
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Optimization of laser welding process: Hermetical weld between a medium carbon steel and a low carbon steel shim2017Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
  • 328.
    Öhrn Sten, Niklas
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Design and development of a new invented doctor blade: Design och utveckling av nyuppfunnet kräppningsblad2014Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This report contains the development and construction of a new patented doctor blade. A doctor blade is used when creping soft paper from a large rotating Yankee cylinder. At the current state the doctor blade are in use for four to six hours before it needs to be switch due to wearing, stopping the production of soft paper. The new idea is to have a very long and small blade that will slide into a fixed blade and be continuously pulled when creping paper. The company CS Production had a concept of the fixed blade but wanted to further develop it since the blade was too wide.

     

    Measurements where done with the old blade and with the old testing device to measure the pull force required to pull the blade. New concepts where made by the method of brainstorming and evaluated with an elimination matrix. Rivet joints where selected as the joining technique for the new design. The new concept contains one dominant blade that smaller parts were assembled to form the final blade. The material selected for the dominant blade and the section blade was a cold rolled stainless spring steel strip and for the middle disc the material was aluminum bronze string casted. Test on the pull force required where done with the new doctor blade in the new test rig.  FEM simulation where done on a small part of the blade to see where stresses are occurring in the blade. The FEM result showed that no stresses where on the middle discs, rivets or section blades. This is not reliable results because the small doctor blade is pushing down onto the middle discs and stresses should be occurring on the discs.  Further testing is needed to see if the blade can withstand the forces applied to it.

  • 329.
    Östberg, Martin
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Industrialisering av konsumentprodukt: Från inkommande material till färdigvarulager2014Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This report examines the industrialization of a newly developed household machine on behalf of Technogarden Engineering Resources in Karlstad, Sweden. The report is a part of the final course in the Bachelor Program in Mechanical Engineering at Karlstad University and takes place in spring 2014.

    An innovator, an investor and a engineering consultant firm have through collaboration developed a new type of gruel machine. The product is in its final stage of construction and is planned to be manufactured in a production located in Sweden, autumn of 2014.

    To compete against today’s trend in outsourcing manufacturing to low cost countries for better profitability, the industrialization of the gruel machine must be done with a minimum amount of resources in order to become successful, which also describes the problem of this study. Using pre-study material in form of Lean production literature, visiting a successful production site and gathering data from involved engineers a specification was developed which describes what this industrialization must achieve and which requests can be accomplished. The specification involves the main questions such as capacity in number of gruel machines produced in a certain amount of time, ergonomics and how to achieve equal product quality.

    A comprehensive product study has been done to identify how the machine is meant to be assembled where the focus was to analyze timing, identifying item groups and assembly sequence. Six concepts on different factory layouts were created using two dimensional sketches of the actual plant chosen for the machine. The sketches show visual layouts of how the production equipment can be physically arranged in order to assemble the machine. The concepts are then assessed according to a valuation schedule in which the main factors are arranged and an engineering assessment is made of how well the different concepts satisfy these factors. From the valuation schedule the concepts obtain a score and the concept with the highest score wins.The winning concept was worked further on by developing a detailed layout using software Google Sketchup. Using the detailed layout a cost-estimation was made on the manufacturing equipment needed.

    The results of the study show that the gruel machine best is assembled together in a continuous production in form of a line layout. The assembly process is done by operators manually distributed among four stations equipped with materials via rack of items. Two of these layouts are required to meet the market demand at 20 000 gruel machines a year. An exact sizing of commodity and finished inventories could not be determined because of underdetermined suppliers and deliveries.

  • 330.
    Özkayalar, Merdan
    Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
    Designförslag på framdrivning i nytt hybridfordon2014Självständigt arbete på grundnivå (högskoleexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
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