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  • 1.
    Fernberg, Patrik
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP. Luleå University of Technology, Sweden.
    Gong, Guan
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Mannberg, Peter
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Tsampas, Spyros
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Development of novel high Tg polyimide-based composites. Part I: RTM processing properties2018In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, no 2, p. 253-260Article in journal (Refereed)
    Abstract [en]

    In this study, an assessment of the composite processing-related properties of a newly developed 6-FDA-based phenylethynyl-terminated polyimide (available under the tradename NEXIMID®MHT-R) is presented. Processing schemes, used for preparing high quality carbon fibre-reinforced composites by the use of conventional resin transfer moulding are developed and presented. The influences of manufacturing parameters on glass transition temperature of the composites are presented. The results confirm that composites with exceptionally high Tg, in the range between 350 and 460℃ can be achieved. A manufacturing scheme that yields in composites with Tg of 370℃ is presented and proposed as a good candidate to serve as baseline for further studies.

  • 2.
    Grammatikos, Sotirios
    et al.
    NTNU Norwegian University of Science and Technology, Norway.
    Tsampas, Spyros
    GKN Aerospace Engine Systems, Sweden.
    Petterson, Jocke
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Luping, Tang
    Chalmers University of Technology, Sweden.
    Löfgren, Ingemar
    Thomas Concrete Group AB, Sweden.
    RECYCLING AND RE-PURPOSING DECOMMISIONEDCONSTRUCTION POLYMER COMPOSITES FOR CONSTRUCTIONAPPLICATIONS2018Conference paper (Refereed)
    Abstract [en]

    Fibre reinforced polymer composites (FRPs) are being increasingly used in aerospace and automotiveapplications due to their high specific mechanical properties. The construction industry has also startedtaking advantage of the potential of FRPs for both structural and non-structural purposes. The result ofthis remarkable absorption of FRPs within the worldwide production market, has led to an immenseincrease of decommissioned thermoset-matrix components. Nowadays, the majority of thedecommissioned FRP components are recovered energy-wise through incineration or simply discardedin landfills around the globe. Within the framework of this paper, we present a solution for theextension of the service life of decommissioned FRP components. Decommissioned electricalinsulation FRP pipes were granulated and incorporated as fillers within both cementitious and polymermatrix composites. The effect of FRP granulates on the mechanical performance of cementitious andpolymer matrix composites is examined to determine the maximum granulate-filler fraction that can berecycled without compromising the mechanical performance and manufacturing process.

  • 3.
    Khosroshahi, S. F.
    et al.
    University of Padova, Italy.
    Tsampas, Spyros
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Galvanetto, U.
    University of Padova, Italy.
    Feasibility study on the use of a hierarchical lattice architecture for helmet liners2018In: Materials Today Communications, ISSN 2352-4928, Vol. 14, p. 312-323Article in journal (Refereed)
    Abstract [en]

    Helmets are the most important piece of protective equipment for motorcyclists. The liner of the helmet is the main part of the helmet which dissipates the impact energy and mitigates the load transmitted to the head. Therefore, optimizing the material that absorbs most of the impact energy would improve the helmet's protection capacity. It is known that the energy absorption of the helmet liner can be optimized by means of using liners with varying properties through the thickness, however currently the majority of used liners exhibit constant properties through the thickness. Advances in the field of topology optimization and additive manufacturing provide the ability of building complex geometries and tailoring mechanical properties. Along those lines, in the present work the feasibility of using a hierarchical lattice liner for helmets was studied. Finite element method was employed to study whether a hierarchical lattice liner could reduce the risk of head injuries in comparison to currently used liner materials. The results show that using a hierarchical lattice liner has the potential of significantly reducing the risk of head injury compared to a helmet with traditional EPS liner and could potentially be considered as the new generation of energy absorbing liners for helmets.

  • 4.
    McElroy, Mark
    et al.
    NASA Langley Research Center, USA.
    Jackson, Wade
    NASA Langley Research Center, USA.
    Olsson, Robin
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Hellström, Peter
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Tsampas, Spyros
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Pankow, Mark
    North Carolina State University, USA.
    Interaction of delaminations and matrix cracks in a CFRP plate, Part I: A test method for model validation2017In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 103, p. 314-326Article in journal (Refereed)
    Abstract [en]

    Isolating and observing the damage mechanisms associated with low-velocity impact in composites using traditional experiments can be challenging, due to damage process complexity and high strain rates. In this work, a new test method is presented that provides a means to study, in detail, the interaction of common impact damage mechanisms, namely delamination, matrix cracking, and delamination-migration, in a context less challenging than a real impact event. Carbon fiber reinforced polymer specimens containing a thin insert in one region were loaded in a biaxial-bending state of deformation. As a result, three-dimensional damage processes, involving delaminations at no more than three different interfaces that interact with one another via transverse matrix cracks, were observed and documented using ultrasonic testing and X-ray computed tomography. The data generated by the test is intended for use in numerical model validation. Simulations of this test are included in Part II of this paper.

  • 5.
    Monti, M.
    et al.
    Proplast Consortium, Italy.
    Tsampas, Spyros
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Fernberg, Patrik
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Blomqvist, P.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Camino, G.
    Proplast Consortium, Italy; Politecnico di Torino, Italy.
    Montmorillonite-doped commingled composites for improved fire performance2014Conference paper (Refereed)
    Abstract [en]

    In this paper, we report the development of a glass fiber commingled composite (GFCC) based on a nanoclay-doped polyamide 6 (PA6) and the evaluation of its combustion behavior. The preparation of the composite has involved several steps. Firstly the nanoclay was dispersed in the PA6 matrix. Then, the produced compound was spun in filaments and commingled with glass fibers. Finally, the laminate preform was consolidated. In order to evaluate the effect of the nanoclay on the combustion behavior of the GFCC, samples based on the neat PA6 were produced as well. The results show that the effect of the nanocomposite matrix was a significant improvement regarding heat release when a continuous external heat flux is applied (cone calorimeter), whereas in the presence of the glass fibers the positive effect is more pronounced in tests where a small flame is induced to ignite the vertically oriented sample (UL94 vertical burning test). This is connected to the different mechanisms by which the nanoclay affects the combustion behavior, whether in the presence of glass fibers or not.

  • 6.
    Monti, Marco
    et al.
    Proplast Consortium, Italy.
    Tsampas, Spyros
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Fernberg, Patrik
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP. Luleå University of Technology, Sweden.
    Blomqvist, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Cuttica, Fabio
    Polytechnic University of Turin, Italy.
    Fina, Alberto
    Polytechnic University of Turin, Italy.
    Camino, Giovanni
    Polytechnic University of Turin, Italy.
    Fire reaction of nanoclay-doped PA6 composites reinforced with continuous glass fibers and produced by commingling technique2015In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 121, p. 1-10Article in journal (Refereed)
    Abstract [en]

    In this paper, we report the development of a glass fiber commingled composite (GFCC) based on a nanoclay-doped polyamide 6 (PA6) and the evaluation of its fire reaction. The preparation of the composite comprised several steps. Firstly, the nanoclay was dispersed in the PA6 matrix. Then, the produced compound was spun in filaments and commingled with continuous glass fibers. Finally, the laminate preform was consolidated. Reference samples based on the neat PA6 were produced as well. As a results, although it is well known that, in the presence of a relevant amount of continuous fibers, the behavior of the material is mainly driven by the fibers themselves (e.g. mechanical, thermal, conductive, and so on), the effect of the clay was interesting, especially in flammability test (UL94 vertical burning test), where the total burning time passes from 227 s to 146 s.

  • 7.
    Tsampas, Spyros
    et al.
    Luleå University of Technology, Sweden.
    Fernberg, Patrik
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP. Luleå University of Technology, Sweden.
    Joffe, Roberts
    Luleå University of Technology, Sweden.
    Development of novel high T-g polyimide-based composites. Part II: Mechanical characterisation2018In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, no 2, p. 261-274Article in journal (Refereed)
    Abstract [en]

    In this study, the mechanical performance assessment of a newly developed carbon fibre-reinforced polyimide composite system T650/NEXIMID (R) MHT-R is presented. This system was subjected to a series of mechanical tests at ambient and elevated temperature (320?) to determine basic material properties. Moreover, an additional test was conducted, using a T650/NEXIMID (R) MHT-R laminate in which the fibre sizing was thermally removed prior to laminate manufacturing, to investigate the effect of fibre treatment on mechanical performance. The experimental results indicated that the T650/NEXIMID (R) MHT-R composites along with exceptionally high T-g (360-420?) exhibited competitive mechanical properties to other commercially available polyimide and epoxy-based systems. At elevated temperature, the fibre-dominated properties were not affected whilst the properties defined by matrix and fibre/matrix interface were degraded by approximately 20-30%. Finally, the fibre sizing removal did not affect the tensile and compressive strength, however, the shear strength obtained from short-beam shear test was deteriorated by approximately 15%.

1 - 7 of 7
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