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  • 151.
    Vadivel, Hari Shankar
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement. University of Ljubljana, 1000, Ljubljana, Slovenia.
    Bek, Marko
    University of Ljubljana, 1000, Ljubljana, Slovenia.
    Šebenik, Urška
    University of Ljubljana, 1000, Ljubljana, Slovenia.
    Slemenik Perše, Lidija
    University of Ljubljana, 1000, Ljubljana, Slovenia.
    Kádár, Roland
    Chalmers University of Technology, 41296, Sweden.
    Emami, Nazanin
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Kalin, Mitjan
    University of Ljubljana, 1000, Ljubljana, Slovenia.
    Do the particle size, molecular weight, and processing of UHMWPE affect its thermomechanical and tribological performance?2021Ingår i: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 12, s. 1728-1737Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    UHMWPE has exhibited excellent performance when used as contact surfaces in tribological contacts. Traditionally, only UHMWPE grades, with narrow particle size and molecular weight distribution, have been deemed suitable for such applications. Now, various UHMWPE grades are available that are different from each other based on their particle size and molecular weight distribution. The question of whether the particle size of UHMWPE affects its performance and properties presents a research gap. The present study attempts to address this question. Additionally, the effect of processing of the UHMWPE is studied. It is observed that although minor differences were observed in the properties of the various grades of UHMWPE, they are inadequate to conclusively determine that the particle size and processing effect the properties and performance of the material.

  • 152.
    Vadivel, Hari Shankar
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement. Laboratory for Tribology and Interface Nanotechnology, University of Ljubljana, Ljubljana, 1000 Slovenia.
    Somberg, Julian
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Kalin, Mitjan
    Laboratory for Tribology and Interface Nanotechnology University of Ljubljana Ljubljana 1000 Slovenia.
    Emami, Nazanin
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Tribological performance of a UHMWPE-based multiscale composite under different lubrication and loads2022Ingår i: Lubrication Science, ISSN 0954-0075, E-ISSN 1557-6833, Vol. 34, nr 7, s. 480-492Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An UHMWPE-based multiscale composite containing graphene oxide, nanodiamonds, and short carbon fibres has shown excellent performance under distilled water lubrication. However, it is crucial to evaluate its tribological performance under conditions which more accurately represent the final application. In this study, the tribological performance of the developed UHMWPE-based multiscale composite is evaluated and compared with neat UHMWPE under different lubricating conditions: no lubricant (dry), in seawater (SW) and in an environmentally acceptable lubricant (EAL). While neat UHMWPE displays a lower friction and wear in dry conditions, the multiscale composite performs better under SW and EAL lubrication. A maximum reduction in friction coefficient of 77% and specific wear rate of 88% are obtained in SW. Under EAL lubricated conditions, the multiscale composite has a maximum reduction in specific wear rate of up to 75%. 

  • 153.
    Ventura, Alejandra M.
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Kneissl, Lucas M.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Nunes, Stephanie
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Emami, Nazanin
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Recycled carbon fibers as an alternative reinforcement in UHMWPE composite. Circular economy within polymer tribology2022Ingår i: Sustainable Materials and Technologies, ISSN 2214-9937, Vol. 34, artikel-id e00510Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The increasing demand of carbon fiber reinforced polymers over the last few decades has brought attention to critical aspects such as disposal, environmental impact, and cost of production. Therefore, adopting a circular economy approach focused on improving efficiency is an enticing alternative nowadays. This investigation is focused on the mechanical and tribological characterization of ultra high molecular weight polyethylene (UHMWPE) composites reinforced with virgin (vCF) and recycled carbon fibers (rCF) under water lubricated conditions. An improvement of 208% in Young's modulus, 105% in ultimate tensile strength and 146% in hardness for the samples with 30%wt rCF, compared to pure UHMWPE, was observed. Reductions of up to 62% in coefficient of friction and 32% in wear rates for 10 wt% CF composites were obtained, facilitated through the formation of a transfer film, which was present on the countersurfaces. The results of this project show that the composites containing recycled fibers exhibit a comparable performance to their virgin counterparts. An economical evaluation estimated possible monetary savings of 910.2 M€ in a time span from 2022 to 2026 by using rCF in composite production, providing arguments for the use of rCF reducing the environmental impact and cost without compromising performance.

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