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  • 1.
    Al-Maqdasi, Zainab
    et al.
    Luleå University of Technology, Sweden.
    Gong, Guan
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Nyström, Birgitha
    Podcomp AB, Sweden.
    Emami, Nazanin
    Luleå University of Technology, Sweden.
    Joffe, Roberts
    Luleå University of Technology, Sweden.
    Characterization of Wood and Graphene Nanoplatelets (GNPs) Reinforced Polymer Composites.2020In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 13, no 9, article id E2089Article in journal (Refereed)
    Abstract [en]

    This paper investigates the utilization of commercial masterbatches of graphene nanoplatelets to improve the properties of neat polymer and wood fiber composites manufactured by conventional processing methods. The effect of aspect ratio of the graphene platelets (represented by the different number of layers in the nanoplatelet) on the properties of high-density polyethylene (HDPE) is discussed. The composites were characterized for their mechanical properties (tensile, flexural, impact) and physical characteristics (morphology, crystallization, and thermal stability). The effect of the addition of nanoplatelets on the thermal conductivity and diffusivity of the reinforced polymer with different contents of reinforcement was also investigated. In general, the mechanical performance of the polymer was enhanced at the presence of either of the reinforcements (graphene or wood fiber). The improvement in mechanical properties of the nanocomposite was notable considering that no compatibilizer was used in the manufacturing. The use of a masterbatch can promote utilization of nano-modified polymer composites on an industrial scale without modification of the currently employed processing methods and facilities.

  • 2.
    Pallon, Love K. H.
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Corrosion.
    Persson, Olle
    RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
    Marklund, Erik
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Malm, A
    RISE Research Institutes of Sweden.
    Johansson, T.
    RenoveraVA, Sweden.
    Condition monitoring of excavated CIPP-liners to ensure lifespan2020In: 37th International NO-DIG Conference and Exhibition 2019, International Society for Trenchless Technology , 2020Conference paper (Refereed)
    Abstract [en]

    In Sweden there is a lack of knowledge on the expected service life of installed CIPP-liners and a general aim to request CIPP-liners with a 100-year lifespan. In cooperation with Swedish water utilities a national project has been launched for condition monitoring of used CIPP-liners. A large number of CIPP-liners installed in sewage pipes will be excavated and analyzed in order to evaluate material degradation and estimating remaining service life. The CIPP-liners are all between 5-35 years old. The material performance of the CIPP-liners are either compared with the reference data provided from the installation, or in some case compared to pieces of corresponding CIPP-liners that have been kept in a storage. These pieces becomes especially valuable when looking at possible changes in mechanical properties that may have occurred during the time in use. The materials will be assessed by e.g. bending modulus to investigate material integrity and e.g. FT-IR for chemical stability in the environment of the sewage system. In total the results will give a valuable tool in assessing the expected lifetime of the installed CIPP-liners. The knowledge acquired will help Swedish water utilities to predict service life of installed CIPP-liners and to set sufficient quality demands on new installations for pipe renovation. At an initial stage two excavated CIPP-liners that have been in use for 12 and 16 years have been analyzed and compared with reference data from the time of installation.

  • 3.
    Saseendran, Sibin
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Berglund, Daniel
    RISE Research Institutes of Sweden, Materials and Production.
    Varna, Janis
    Luleå University of Technology, Sweden.
    Viscoelastic model with complex rheological behavior (VisCoR): incremental formulation2020In: Advanced Manufacturing: Polymer and Composites Science, ISSN 2055-0359Article in journal (Refereed)
    Abstract [en]

    A thermo-rheologically complex linear viscoelastic material model, accounting for temperature and degree of cure (DoC), is developed starting with series expansion of the Helmholtz free energy and systematically implementing simplifying assumptions regarding the material behavior. In addition to the temperature and DoC dependent shift factor present in rheologically simple models, the derived novel model contains three cure and temperature dependent functions. The first function is identified as the rubbery modulus. The second is a weight factor to the transient integral term in the model and reflects the current temperature and cure state, whereas the third function is under the sign of the convolution integral, thus affecting the “memory” of the material. An incremental form of this model is presented which, due to improved approximation inside the time increment, has better numerical convergence than most of the similar forms. Parametric analysis is performed simulating stress development in a polymer, geometrically constrained in the mold during curing and cool-down. The importance of using proper viscoelastic model is shown, and the role of parameters in the model is revealed and discussed. © 2019, © 2019 The Author(s).

  • 4.
    Stig, Fredrik
    et al.
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Hallström, Stefan
    KTH Royal Institute of Technology, Sweden.
    Extended framework for geometric modelling of textile architectures2020In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 244, article id 112239Article in journal (Refereed)
    Abstract [en]

    Three dimensional (3D) textiles are finding their way into fibre reinforced composite applications, and for good reasons; they can eliminate the hazard of delamination and enable complex reinforcement shapes. There is therefore a need for engineering methods to simulate these advanced textile structures during the product development phase. This is many times challenging since the textile architecture is truly 3D and not built by layers as in conventional laminated composites. The overall approach is similar as in a method previously presented by the authors, but some steps are changed that enable modelling of textiles containing strongly curved yarns, yet with very good geometric representation. That is essential for reliable simulations of all parts of the 3D reinforced composite materials, which could then be performed at close to authentic meso level resolution. The resulting textile geometries are very similar to the real materials they represent, both in terms of variation of yarn cross section area and shape along the length of the yarns. This is demonstrated by comparison of details between the real materials and the numerical implementations of their geometry.

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