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  • 1.
    Asp, Leif
    RISE, Swerea, Swerea SICOMP.
    Multifunctional composite materials for energy storage in structural load paths2013In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 42, no 4, p. 144-149Conference paper (Refereed)
    Abstract [en]

    This paper presents an overview of the research performed to date by a Swedish interdisciplinary team of scientists striving to develop multifunctional composite materials for storage of electric energy in mechanical load paths. To realise structural batteries from polymer composites, research pursued on carbon fibres for use as negative electrode in the battery as well as on polymer electrolytes for use as polymer matrix in the composite is reported. The work on carbon fibres comprises characterisation of the electrochemical capacity of commercial carbon fibre grades and how this is affected by mechanical load. Co-polymers are studied for their multifunctional performance with respect to lithium ion conductivity and stiffness. Also, rational processing of these polymer electrolytes and the effect of processing on their properties are addressed. © 2013 Institute of Materials, Minerals and Mining.

  • 2.
    Gong, Guan
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Nyström, Birgitha
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Joffe, Roberts
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Enhanced thermal stability and flame retarding properties of recycled polyethylene based wood composites via addition of polyethylene/nanoclay masterbatch2013In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 42, no 6, p. 244-255Article in journal (Refereed)
    Abstract [en]

    Barrier and mechanical properties of wood powder composites based on recycled polyethylene (RPE) were modified using a commercial nanoclay masterbatch. X-ray diffraction, dynamic rheology and thermogravimetric analysis measurements showed that nanoclay from the selected masterbatch was well dispersed and formed a percolation network in both virgin and RPEs. The resulting nanocomposites promoted the thermal stability of matrix significantly. Modification efficiency of nanoclay, however, was evidently influenced by the type of matrix, where the strongest effect was achieved in a low viscosity virgin high density PE. The masterbatch was incorporated into an industrial formula designed extrusion quality RPE/wood flour composite. Processing procedures, mainly compounding cycles, and material composition, mainly clay content and type of coupling agent, were optimised. Two extrusion cycles led to higher uniformity of resulting composites than one cycle. Addition of a coupling agent, which has medium viscosity and plenty functional groups, led to enhanced tensile strength. The twice compounded composites were well stiffened and strengthened via combination of 6 wt-% clay and medium viscosity coupling agent. All composites without the addition of nanoclay burned faster after ignition and dripped much earlier and more compared to the composites containing nanoclay even with as small amount as 3 wt-% and being compounded once. The material with 6 wt-% clay showed the best sample integrity and burned slowest of all the tested composites. Furthermore, no dripping during combustion was seen for this material. This study shows that the incorporation of nanoclay using the selected masterbatch can effectively improve the flame retarding properties of RPE based wood composites. © Institute of Materials, Minerals and Mining 2013.

  • 3.
    Nilsson, Sören
    et al.
    RISE, Swerea, Swerea SICOMP.
    Bredberg, A.
    Saab Aerostructures.
    Asp, Leif
    RISE, Swerea, Swerea SICOMP.
    Effects of CFRP laminate thickness on bending after impact strength2009In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 38, p. 61-66Conference paper (Refereed)
    Abstract [en]

    This paper describes a series of experiments set out to explore the strength of bending loaded impacted monolithic composite panels with different thicknesses. Two laminate thicknesses are tested, both exposed to the same impact event in a drop tower with 35 J using a spherical tup with a radius of 8 mm. Accompanying tests in compression are performed and reported to allow evaluation of the full effects of bending. A limited fractographic analysis is also performed to study damage distribution after impact as well as after mechanical tests. It has been demonstrated that damage distribution through the thickness affects the bending properties of the laminate as the failure load was lower when the side with the largest delamination was loaded in compression. As expected it has also been demonstrated that the far field failure strain is higher at bending compared to compression loading. © Institute of Materials, Minerals and Mining 2009.

  • 4.
    Olsson, N.E.J.
    et al.
    Luleå University of Technology.
    Lundström, T.S.
    Luleå University of Technology.
    Olofsson, Kurt
    RISE, Swerea, Swerea SICOMP.
    Design of experiment study of compression moulding of SMC2009In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 38, p. 426-431Conference paper (Refereed)
    Abstract [en]

    The effect of vacuum assistance, mould temperature and ram velocity on the void transport and flow behaviour for sheet moulding compound (SMC) have been investigated with a design of experiment approach of the compression moulding phase. The relative amount of voids has been quantified with a high voltage insulation test and the flow behaviour has been quantified with image analysis of samples moulded with coloured SMC. In conclusion, the setting of high vacuum, low ram velocity and low mould temperature creates a homogeneous flow and minimises the amount of voids. © 2009 Institute of Materials, Minerals and Mining.

  • 5.
    Svanberg, Magnus
    RISE, Swerea, Swerea SICOMP.
    Shape distortion of non-isothermally cured composite angle bracket2002In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 31, no 9, p. 398-404Conference paper (Refereed)
    Abstract [en]

    A simulation tool for prediction of shape distortion and residual stresses has been developed by implementing a new material model in the general purpose FE package ABAQUS. To validate the simulation tool, three thick wailed angle brackets were manufactured under non-isothermal conditions. Predicted temperatures, degree of cure, and shape distortions were then compared with the experimental values for the thick walled angle brackets. Predicted and experimental values show good agreement, which verifies that the simulation procedure is reliable under non-isothermal curing conditions. © 2002 IoM Communications Ltd.

  • 6.
    Szpieg, Magdalena
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Wysocki, Maciej
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Asp, Leif
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP.
    Recycled polypropylene aimed as composites precursor material2009In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 38, p. 412-418Article in journal (Refereed)
    Abstract [en]

    The aim of this research is to assess the stability and processability of recycled polypropylene (PP) materials for their suitability for use as matrix material in polymer composite. The work comprises development and characterisation of matrix precursors from recycled PP. The reused PP considered comes from two sources: PP from the self-reinforced PP Pure processing scrap and an automotive grade developed to offer an even material quality. To assess the thermal stability of two PP qualities for subsequent composite manufacturing, oxidation induction time (OIT), melting point Tm, decomposition temperature 7d and viscosity μ were investigated. The results indicate, that Pure processing scrap is very well stabilised and therefore suitable for multiple processing, whereas the automotive grade recycled PP cannot be used for this purpose. Fibres for subsequent composite preforming were spun by melt spinning from the Pure scrap processing and its mechanical properties were characterised. © Institute of Materials, Minerals and Mining 2009.

  • 7.
    Zangani, D.
    et al.
    D'Appolonia SpA.
    Robinson, M.
    University of Newcastle Upon Tyne.
    Gibson, A.G.
    University of Newcastle Upon Tyne.
    Torre, L.
    University of Perugia.
    Holmberg, Anders
    RISE, Swerea, Swerea SICOMP.
    Numerical simulation of bending and failure behaviour of z-core sandwich panels2007In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 36, no 9, p. 389-395Article in journal (Refereed)
    Abstract [en]

    The failure behaviour of fibreglass sandwich panels with structured internal cores (z-cored panels) was studied in bending. A finite element model was developed for the simulation of three point bending tests and this has been validated against experimental results. The model was able to predict both the elastic response and, more importantly, the failure behaviour of the structure. It is therefore suitable for use in the optimising the design of z-core sandwich panels for transport applications. The same modelling approach was also applied to the structural behaviour of a larger sandwich panel with a metallic insert which was employed in the design of a semitrailer as part of a demonstration of the viability of the technology. © 2007 Institute of Materials, Minerals and Mining.

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