Dr.-Ing.

Janssen, Henning

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  • Publication
    Data Collection and Analysis for the Creation of a Digital Shadow During the Production of Thermoplastic Composite Layers in Unbonded Flexible Pipes
    ( 2018)
    Schäkel, Martin
    ;
    McNab, John
    ;
    Dodds, Neville
    ;
    Peters, Tido
    ;
    Janssen, Henning
    ;
    Brecher, Christian
    Unbonded flexible pipes present a mature technology for the efficient recovery and transport of hydrocarbons offshore. The substitution of metallic reinforcement layers in the multilayered structure by thermoplastic fiber-reinforced polymer (FRP) presents a solution for self-weight issues of especially long pipes, as FRP materials display high specific strength and modulus while being resistant to external pressure and corrosion. The production of these layers is automated by the laser assisted tape winding process without the need of additional curing steps. During the manufacturing process, several data like process temperature and consolidation pressure are continuously monitored by non-contact sensors to ensure process stability without interfering in the consolidation process. To gain additional information about the temperature distribution within the multi-layered laminate, contact temperature sensors were introduced in the tape winding process. By this method the temperature of subjacent tapes can be assessed during the continued winding process. Additionally, this paper features a new approach of utilizing winding path data for relating the time-dependent sensor data to the exact position on the produced part. The visualization of path-dependent sensor data opens up possibilities of linking quality monitoring results to manufacturing insufficiencies and potential part defects.
  • Publication
    Efficient production of tailored structural thermoplastic composite parts by combining tape placement and 3d printing
    ( 2017)
    Janssen, Henning
    ;
    Peters, Tido
    ;
    Brecher, Christian
    Thermoplastic composites, such as organosheets and unidirectional tapes, have become more and more popular in recent years. In certain high volume applications, they are often combined with non-reinforced plastics in overmolding processes. However, for product development or customized parts, more flexible process chains for the production of continuous fiber-reinforced thermoplastic parts are required. The automated placement of continuous fiber-reinforced thermoplastic tapes is an additive manufacturing technology which can be used to produce load-optimized tailored blanks. These blanks can be formed and joined with 3d printed structures to complex, function integrated, customized hybrid thermoplastic structures without the need of expensive molds.
  • Publication
    Individuell und automatisiert. Vernetzte Produktionstechnik für die additive Fertigung individualisierter Faserverbundbauteile
    ( 2016)
    Brecher, Christian
    ;
    Werner, Daniel
    ;
    Janssen, Henning
    ;
    Hildebrandt, Markus
    ;
    Beste, Christian
    Die Fertigung von Produkten in großen Stückzahlen weicht zunehmend dem Bedarf nach Produktionslösungen für kostengünstige und individualisierte Produkte. Das bringt neue Herausforderungen für die Produktentwicklung, Prozessflexibilität, Kosteneffizienz und Produktionstechnik. Der Artikel beschreibt einen umfassenden Lösungsansatz für die individualisierte Fertigung geometrisch komplexer faserverstärkter Bauteile.
  • Publication
    Laminate aus duroplastischen Prepregs mit aktivierbarer Adhäsion
    ( 2016)
    Werner, Daniel
    ;
    Janssen, Henning
    ;
    Brecher, Christian
    Neben der Reduktion des manuellen Fertigungsaufwands ist die Senkung der Materialkosten ein wesentlicher Aspekt zur wirtschaftlichen Herstellung faserverstärkter Kunststoffbauteile. Beide Ziele werden durch die Entwicklung neuartiger Matrixsysteme und durch die Entwicklung hierfür anwendbarer automatisierter Verarbeitungsprozesse fokussiert. Die neuartigen Matrixsysteme kombinieren die Vorteile konventioneller duroplastischer und thermoplastischer Matrixsysteme (kostengünstige Harze, einfache Imprägnierung durch niedrige Viskosität bzw. trocken und adhäsionsfrei bei Raumtemperatur, niedrige Taktzeiten, Lagerung bei Raumtemperatur). Die Verarbeitung im automatisierten Tapelegeprozess ermöglicht die Herstellung belastungsoptimierter Strukturbauteile, bei denen Faseranordnung und -orientierung an die erwartete Belastungssituation des Bauteils anpasst sind. Die hieraus resultierenden Möglichkeiten zur Verarbeitung werden am Fraunhofer IPT hergeleitet und untersucht.
  • Publication
    Customized solutions for laser-assisted tape placement
    ( 2012)
    Brecher, Christian
    ;
    Kermer-Meyer, Alexander
    ;
    Werner, Daniel
    ;
    Stimpfl, Joffrey
    ;
    Janssen, Henning
    ;
    Emonts, Michael
    In this paper, Fraunhofer IPT's specialists in the field of laser-assisted tape placement describe the key points of this specific composite manufacturing method. They also show that this technique is suitable for many industries, and not only for aerospace, and explain how to develop the most cost-effective solution.