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  • 1.
    Billur, E.
    et al.
    Ohio State University.
    Demiralp, Y.
    Ohio State University.
    Groseclose, A.R.
    Ohio State University.
    Wadman, Boel
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Altari, T.
    Ohio State University.
    Factors affecting the accuracy of flow stress determined by the bulge test2011In: Special Edition: 10th International Conference on Technology of Plasticity, ICTP 2011, 2011, p. 726-731Conference paper (Refereed)
    Abstract [en]

    The determination of the flow stress curve at room temperature, using the bulge test under biaxial deformation conditions, has been extensively studied. However, two Issues still deserve close examination: (1) validity of assuming a spherical bulge shape and (2) the effects of yield criterion and/or normal anisotropy. In this paper, we present experimental measurements to validate spherical assumption, as well as a methodology to calculate flow stress curves, all the way up to the failure point, that are free from the effects of anisotropy. Experimental studies were conducted on draw quality steel (DQS) and several grades of Dual Phase (DP) Advanced High Strength Steels (AHSS). © 2011 Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim.

  • 2.
    Heikkilä, Irma
    et al.
    Uppsala University, Sweden.
    Wadman, Boel
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Thoors, Håkan
    Bay, Niels
    Clean forming of stainless steel and titanium products by lubricious oxides2012In: Proceedings of NORDTRIB, Trondheim: NTNU , 2012, 2012Conference paper (Refereed)
    Abstract [en]

    Big social benefits can be attained through increased use of stainless steel or titanium in new sheet metal applications. Unfortunately, forming of these materials is often a challenging and costly operation, that can lead to environmental and health problems when solving the technical limitations. One possible method to overcome these problems is to use an oxide layer with optimised properties to reduce friction during forming, either as a substitute to lubricants, or acting as a conversion layer for environmental friendly lubricants. The most beneficial group of oxides for low friction is called lubricious oxides with a rutile crystal structure. Oxides of Ti, Mo, V, and Zn can build rutiles under certain contact temperatures during rolling and forming. The aim of this investigation is to evaluate if oxides designed on metal sheets display a lubricious effect under conditions similar to industrial forming processes. Preliminary evaluations show a beneficial influence of two oxides types, on stainless steel and on titanium. More work is needed to test the lubricating effect in other forming operations and to analyse the sustainability aspects for products manufactured with this alternative surface.

  • 3.
    Svensson, T
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik.
    Wadman, Boel
    de Maré, J
    Determination of the fatigue limit method and problems.2000Report (Refereed)
  • 4.
    Wadman, Boel
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Madsen, Erik
    Grundfos A/S.
    Schedin, E
    Bay, Niels
    Technical University of Denmark.
    Bergström, Fredric
    Uddeholms AB.
    Tooling Solutions for Sheet Metal Forming and Punching of Lean Duplex Stainless Steel2012In: TOOL 2012 - Proceedings of the 9th International Tooling Conference / [ed] H. Leitner, 2012, p. 621-629Conference paper (Refereed)
    Abstract [en]

    For producers of advanced stainless components the choice of stainless material influences not only the product properties, but also the tooling solution for sheet metal stamping. This work describes how forming and punching tools will be affected when introducing the stainless alloys ferritic EN1.4509 and lean duplex EN1.4162 in a production designed for austenitic stainless steels, such as EN1.4301 and 1.4401. The result is a guideline that summarizes how stainless material properties may affect tool degradation, and suggests tool solutions for reduced production disturbances and tool maintenance cost.

  • 5.
    Wadman, Boel
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Ottosson, Peter
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Holmberg, Jonas
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Ingemarsson, Lars-Olof
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Sagström, Elisabeth
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Time-dependent residual stress and geometry analysis of UHSS deep drawn components,2013In: Proceedings of International Deep Drawing Research Group Conference, Zurich, Switzerland, June 2-5., 2013Conference paper (Other academic)
1 - 5 of 5
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