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  • 1.
    Elmquist, Lennart
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, SWECAST.
    Hall, S.
    Lund University, Sweden.
    Sjögren, Torsten
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Dartfeldt, Erik
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Skoglund, P.
    Scania CV AB, Sweden.
    Elfsberg, J.
    Scania CV AB, Sweden.
    Majkut, M.
    European Synchrotron Radiation Facility, France.
    Mechanical and structural characterization of cast iron using synchrotron light2018In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings, 2018, p. 129-130Conference paper (Refereed)
    Abstract [en]

    The paper describes work done using synchrotron light to investigate the microstructure and how it behaves in 3D when a load is applied. Two different cast iron materials with different matrix structures and graphite morphologies were investigated; SiMo51, which is basically a spheroidal iron (SGI) alloyed with Si and Mo, and a lamellar graphite iron (LGI). The tensile test specimens were loaded in steps, at which x-ray tomography as well as 3DXRD measurements were made to characterize the microstructure. The result shows how the crack propagates and which path it takes through the materials. DVC was applied to analyze the strain fields. This work also shows how useful synchrotron experiments can be in the study of the mechanical behavior of cast iron.

  • 2.
    Flansbjer, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium struc2011In: Applied Mechanics and Materials, ISSN 1660-9336, E-ISSN 1662-7482, Vol. 70, p. 123-128Article in journal (Refereed)
  • 3.
    Flansbjer, Mathias
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Using digital image correlation techniques and finite element models for strain-field analysis of a welded aluminium structure2011Conference paper (Refereed)
  • 4.
    Jacobsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Sandström, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Brander, Linus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    ONKALO POSE Experiment - Laboratory Determination of Density, Porosity and Mechanical Anisotropy of Gneiss and Granite2016Report (Other academic)
  • 5. Karlsson, J
    et al.
    Sjögren, Torsten
    Snis, A
    Engqvist, H
    Lausmaa, Jukka
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Digital image correlation analysis of local strain fields on Ti6Al4V manufactured by electron beam melting2014In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 618, p. 456-461Article in journal (Refereed)
    Abstract [en]

    Additive manufacturing, or 3D-printing as it is often called, build parts in a layer-by-layer fashion. A common concern, regardless of the specific additive manufacturing technique used, is the risk of inadequate fusion between the adjacent layers which in turn may cause inferior mechanical properties. In this work, the local strain properties of titanium parts produced by Electron Beam Melting (EBM®) were studied in order to gain information about the quality of fusion of the stock powder material used in the process. By using Digital Image Correlation (DIC) the strain fields in the individual layers were analyzed, as well as the global strain behavior of the bulk material. The results show that fully solid titanium parts manufactured by EBM are homogenous and do not experience local deformation behavior, neither on local nor on a global level.

  • 6. Larsson, Dan
    et al.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Svensson, Ingvar L
    Modelling the plastic deformation behaviour of cast irons,2008In: International Foundry Research, Vol. 64, no 4, p. 08:16-Article in journal (Refereed)
  • 7. Seiffedine, S
    et al.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Flansbjer, Mathias
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Inverkan av porer på mekaniska egenskaper i gjutna aluminiumkomponenter2009In: Gjuteriet, Vol. 5, no 8, p. 21-23Article in journal (Other (popular science, discussion, etc.))
  • 8.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Laminated safety glass and adhesives: A literature survey on experimental techniques and experimental data2012Report (Refereed)
  • 9.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Materials performance assessment of precision cast aluminium components with novel strain analysis techniques2014In: International Foundry Research, no 3, p. 10-Article in journal (Refereed)
  • 10.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Nya metoder för studier av gjutjärns mekaniska egenskaper2011In: Gjuteriet, Vol. 101, no 9, p. 28-30Article in journal (Other (popular science, discussion, etc.))
  • 11.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    On characterization and modelling of mechanical properties of materials for cast components2012In: 70th World Foundry Congress 2012, WFC 2012, 2012, , p. 402-419Conference paper (Refereed)
  • 12.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Autio, A
    Odnegård, K
    Andersson, Hans
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Analysis of strains in cast iron joints using finite element simulations and digital image correlation techniques2012In: 70th World Foundry Congress 2012, WFC 2012, 2012, , p. 396-401Conference paper (Refereed)
  • 13.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Diaconu, Vasile Lucian
    Diószegi, Attila
    Skoglund, Peter
    Influence of molybdenum alloying on thermomechanical fatigue life of compacted graphite irons2012In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 25, no 5, p. 277-286Article in journal (Refereed)
  • 14.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Diaconu, Vasile Lucian
    Skoglund, Peter
    Diószegi, A
    Stress relaxation of compacted graphite iron alloyed with molybdenum2013In: International Journal of Cast Metal Research, Vol. 26, no 1, p. 51-57Article in journal (Refereed)
  • 15.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lausmaa, Jukka
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Snis, Anders
    Engqvist, Håkan
    Karlsson, Joakim
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Digital image correlation analysis of local strain fields on Ti6A14V manufactured by electron beam melting2014In: Materials Science & Engineering A, Vol. 618, p. 456-461Article in journal (Other academic)
  • 16.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Persson, P
    Vomacka, P
    Analysing the deformation behaviour of compacted graphite cast irons using digital image correlation techniques2011In: Key Engineering Materials, Vol. 457, p. 470-475Article in journal (Refereed)
  • 17.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Persson, Per-Eric
    Vormacka, Peter
    Analysing the Deformation Behvaiour of Compacted Graphite Cast Irons Using digital Image Correlation Techniques2010In: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 457, p. 470-75Article in journal (Refereed)
  • 18.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Skoglund, Peter
    Moverare, J
    Fatigue and strength of new grey iron alloys for brake discs2013In: Konferensbidrag till 7th International on Low Cycle Conference Fatigue (LCF7), 2013Conference paper (Other academic)
  • 19.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Skoglund, Peter
    Moverare, J
    Fatigue and strength of new grey iron alloys for brake discs2013Conference paper (Refereed)
  • 20.
    Sjögren, Torsten
    et al.
    SP Technical Research Institute of Sweden.
    Svensson, Henrik
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST.
    Study of the eutectoid transformation in grey cast irons and its effect on mechanical properties2011Conference paper (Refereed)
  • 21.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Svensson, Henrik
    Study of the eutectoid transformation in grey cast irons and its effect on mechanical properties2011In: Key Engineering Materials, Vol. 457, p. 157-152Article in journal (Refereed)
  • 22.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Svensson, Henrik
    Study of the Eutectoid Transformation in Grey Cast Irons and Its Effect on Mechanical Properties2010In: Key Engineering Materials, Vol. 457, p. 157-162Article in journal (Refereed)
  • 23.
    Sjögren, Torsten
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Wilberfors, Fredrik
    Alander, Monika
    Digital image correlation techniques for analysing the deformation behaviour of compacted graphite cast irons on a microstructural level2011In: Applied Mechanics and Materials, ISSN 1660-9336, E-ISSN 1662-7482, Vol. 70, p. 171-176Article in journal (Refereed)
  • 24.
    Svensson, Henrik
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea SWECAST.
    Sjögren, Torsten
    SP Technical Research Institute of Sweden.
    The effect of cooling rate, section size and alloying on matrix structure formation in pearlitic grey cast iron2011Conference paper (Refereed)
  • 25. Svensson, Henrik
    et al.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    The Effect of Cooling Rate, Section Size and Alloying on Matrix Structure Formation in Pearlitic Grey Cast Iron2010In: Key Engineering Materials, Vol. 457, p. 169-174Article in journal (Refereed)
  • 26. Svensson, Henrik
    et al.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    The effect of cooling rate, section size and alloying on matrix structure formation in pearlitic grey cast iron2011In: Key Engineering Materials, Vol. 457, p. 169-174Article in journal (Refereed)
  • 27. Svensson, I
    et al.
    Sjögren, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    On modeling and simulation of mechanical properties of cast irons with different morphologies of graphite2009In: International Journal of Metalcasting, Vol. 3, no 4, p. 67-77Article in journal (Refereed)
  • 28.
    Zhang, Yafan
    et al.
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Hammam, Tag
    RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
    Belov, Ilja
    Jönköping University, Sweden.
    Sjögren, Torsten
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Bakowski, Mietek
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Nee, Hans Peter
    KTH Royal Institute of Technology, Sweden.
    Thermomechanical Analysis and Characterization of a Press-Pack Structure for SiC Power Module Packaging Applications2017In: IEEE Transactions on Components, Packaging, and Manufacturing Technology, ISSN 2156-3950, E-ISSN 2156-3985, Vol. 7, no 7, p. 1089-1100Article in journal (Refereed)
    Abstract [en]

    This paper presents an experimental methodology for the characterization of thermomechanical displacement and friction properties in a free-floating press-pack structure, and evaluation of the tensile stress on the semiconductor die through simulation of different mechanical and thermal loading conditions. The press-pack structure consists of a single silver-metallized (1 μm) silicon carbide die (400 μm) in contact with rhodium-coated (0.4 μm) molybdenum square plates. The thermomechanical displacements in the press-pack structure have been obtained using the digital image correlation technique, and the mean random error has been $± $0.1 μm, which is approximately 10 ppm of the measured length (10.5 mm). The developed experimental method has led to an analytical estimation of friction coefficients on the interfaces' silicon carbide-molybdenum and molybdenum-copper. The results demonstrate that the thin silver layer behaves as a solid film lubricant. A 2-D finite-element model representing the experimental setup has been implemented. The difference in displacement between measurement and simulation is less than 8%. Furthermore, the coinfluence of the design parameters on the thermomechanical performance of the stacked structure has been analyzed through simulations. Finally, design guidelines to reduce the tensile stress on the silicon carbide die have been proposed regarding free-floating press-pack power electronics packaging.

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