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@PHDTHESIS{Uthemann:989653,
      author       = {Uthemann, Carsten},
      othercontributors = {Gries, Thomas and Hermann, Axel},
      title        = {{H}ochorientierte multiaxiale {F}lachsfasergelege für den
                      nachhaltigen {S}trukturleichtbau},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2024-06918},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2024},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2024},
      abstract     = {The transition towards the use of renewable resources is a
                      promising building block for the implementation of
                      ecologically sustainable fibre-reinforced plastics. In terms
                      of fibre material, the use of natural fibres offers
                      particular potential. Currently, natural fibres are
                      primarily used in non-structural applications. This is due
                      in particular to the use of yarns. Yarn production is
                      cost-intensive and implies a twisting of the fibres. This
                      entails decisive disadvantages with regard to the achievable
                      mechanical properties of the composite material. In this
                      thesis, the requirements for processing natural fibres while
                      saving on yarn production are thus developed. The solution
                      approach involves the development of a suitable technology
                      for processing flax fibre slivers into a high-performance
                      ±45° multiaxial non-crimp fabric. The approach includes
                      the necessary machine development, material qualification,
                      ecological evaluation and economic assessment of the
                      materials and processes. The machine development is
                      performed according to the guideline VDI 2221. The main
                      component of the novel system is a sliver feeder with
                      temporary solidification by means of false twist. The proof
                      of concept is achieved through production trials.
                      Subsequently, the non-crimp fabric and the resulting
                      composite material are qualified. The fabric is analysed
                      with regard to homogeneity, drapability and impregnability.
                      The evaluation is based on a utility analysis. The tensile,
                      compression, bending and shear properties of the composite
                      material are investigated on coupon level. The material is
                      assessed using performance indices taking into account the
                      properties of reference materials. This is followed by an
                      ecological assessment by means of a product-related life
                      cycle assessment according to DIN EN ISO 14040 and DIN EN
                      ISO 14044 for an automotive demonstrator part. The
                      evaluation is based on a contribution analysis, focussing on
                      the CO2 equivalents caused by the materials and processes.
                      Finally, an economic assessment is performed. The proof of
                      market viability is provided by means of a cost comparison
                      analysis for the fabric production as well as the material
                      costs of the demonstrator part.},
      cin          = {419110},
      ddc          = {620},
      cid          = {$I:(DE-82)419110_20140620$},
      pnm          = {Entwicklung einer High-Performance
                      Naturfaser-Verbundwerkstoffes für Strukturbauteile
                      (HyPer-NFK) (19400 N) / Entwicklung von Multiaxialgelegen
                      aus recycelten Carbonfasern - CarboReFab (21237 N)},
      pid          = {G:(BMWK)19400 N / G:(BMWK)21237 N},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2024-06918},
      url          = {https://publications.rwth-aachen.de/record/989653},
}