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  1. Book ; Thesis: "De vettonica herba" deutsch: Der "Batungentraktat" in südostdeutschen Überlieferungen des Spätmittelalter

    Henning, Frank

    I. Die Wiener Fassung ; Einleitung, Text

    1998  

    Author's details vorgelegt von Frank Henning
    Language German
    Size 47 S.
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Würzburg, Univ., Diss., 1999
    HBZ-ID HT010505579
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    99 D 1459 order for loan Magazin

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  2. Article ; Online: Approaching Polycarbonate as an LFT-D Material: Processing and Mechanical Properties.

    Schelleis, Christoph / Scheuring, Benedikt M / Liebig, Wilfried V / Hrymak, Andrew N / Henning, Frank

    Polymers

    2023  Volume 15, Issue 9

    Abstract: Long-fiber thermoplastic (LFT) materials compounded via the direct LFT (LFT-D) process are very versatile composites in which polymers and continuous reinforcement fiber can be combined in almost any way. Polycarbonate (PC) as an amorphous thermoplastic ... ...

    Abstract Long-fiber thermoplastic (LFT) materials compounded via the direct LFT (LFT-D) process are very versatile composites in which polymers and continuous reinforcement fiber can be combined in almost any way. Polycarbonate (PC) as an amorphous thermoplastic matrix system reinforced with glass fibers (GFs) is a promising addition regarding the current development needs, for example battery enclosures for electromobility. Two approaches to the processing and compression molding of PC GF LFT-D materials with various parameter combinations of screw speed and fiber rovings are presented. The resulting fiber lengths averaged around 0.5 mm for all settings. The tensile, bending, Charpy, and impact properties were characterized and discussed in detail. Special attention to the characteristic charge and flow area formed by compression molding of LFT-D materials, as well as sample orientation was given. The tensile modulus was 10 GPa, while the strength surpassed 125 MPa. The flexural modulus can reach up to 11 GPa, and the flexural strength reached up to 216 MPa. PC GF LFT-D is a viable addition to the LFT-D process, exhibiting good mechanical properties and stable processability.
    Language English
    Publishing date 2023-04-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15092041
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Online ; Thesis: Prozessspezifische Einflussgrößen auf die Morphologie kontinuierlich faserverstärkter thermoplastischer Halbzeuge und deren Auswirkungen auf die mechanischen Eigenschaften

    Link, Tobias [Verfasser] / Henning, Frank [Akademischer Betreuer] / Fleischer, Jürgen [Akademischer Betreuer]

    2023  

    Author's details Tobias Link ; Frank Henning, Jürgen Fleischer
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language German
    Publisher KIT-Bibliothek
    Publishing place Karlsruhe
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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  4. Conference proceedings ; Online: Study on mechanical characteristics of glass fiber-reinforced polycarbonate LFT-D for codico structures

    Schelleis, Christoph / Scheuring, Benedikt M. / Hrymak, Andrew / Henning, Frank

    2023  

    Abstract: Long fiber thermoplastic (LFT) materials can be compounded in an effective LFT direct (LFT-D) process. Polycarbonate (PC) is used in various applications for example in and around battery enclosures for electro mobility. Reinforced with glass fibers (GF), ...

    Abstract Long fiber thermoplastic (LFT) materials can be compounded in an effective LFT direct (LFT-D) process. Polycarbonate (PC) is used in various applications for example in and around battery enclosures for electro mobility. Reinforced with glass fibers (GF), PC exhibits solid mechanical properties and is a promising and novel addition to the material portfolio of the LFT-D process considering current industry demands. Combining continuous (Co) and discontinuous (DiCo) fiber reinforced polymers (FRP) according to their respective strengths enables unique design freedom to this class of materials. LFT-D materials can be used as the DiCo phase. The semi-finished material of the LFT-D process, called plastificate, is placed in the charge area and will fill the mold during compression molding forming the flow area. These areas are very distinct in their microstructure. In this work, PC GF LFT-D is produced at various process parameter sets and molded into plates. Screw speed and fiber roving amount is varied. Plates were characterized for their fiber mass fraction, fiber length and tensile properties. Fiber mass fraction as well as fiber length are very homogenous over charge and flow area. Tensile properties are characterized in the flow area in eight adjacent positions. A strong influence of sample position on modulus and strength, resulting in deviations of up to twenty-five percent from highest to lowest value, is present. Running the extruder at increasing screw speeds improves Young’s modulus as well as tensile strength.
    Keywords Composite ; Fiber length distribution ; Fiber mass distribution ; Tensile properties ; Plastificate
    Subject code 621
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Conference proceedings ; Online: 3D Skeleton Winding (3DSW) - Robot-based 3D Filament Winding and FEA-based Dimensioning of Skeleton-like Continuous Fiber-Reinforcements for Thermoplastic Structural Parts

    Haas, Jonathan / Beck, Björn / Park, Young-Bin / Henning, Frank

    2023  

    Abstract: The 3D Skeleton Winding (3DSW) technology is implemented and validated using the example of a three-dimensional structural component. Compared to a short fiber-reinforced variation of the same component, the 3DSW-reinforced part offers a higher load ... ...

    Abstract The 3D Skeleton Winding (3DSW) technology is implemented and validated using the example of a three-dimensional structural component. Compared to a short fiber-reinforced variation of the same component, the 3DSW-reinforced part offers a higher load bearing capacity at lower component mass. In a separate investigation, a workflow for the Finite Element Analysis of 3D filament wound skeleton structures is proposed, implemented and validated. The FEA-based predictions of the specimen’s stiffness and failure load are within the scatter range of the experimentally determined values.
    Keywords 3D Skeleton Winding ; 3DSW ; local reinforcement ; injection molding ; Finite Element Analysis ; FEA ; geometry analysis ; DDC::500 Naturwissenschaften und Mathematik::540 Chemie
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Conference proceedings ; Online: Fiber breakage modeling based on hydrodynamic Forces in macroscopic process simulations

    Wittemann, Florian / Maertens, Robert / Henning, Frank / Kärger, Luise

    2022  

    Abstract: 629 ... 636 ... Injection molding is one of the most important processes for manufacturing parts from discontinuous fiber reinforced polymers. Fiber length and orientation do not only influence the final structural behavior in an anisotropic way, but also ... ...

    Abstract 629

    636

    Injection molding is one of the most important processes for manufacturing parts from discontinuous fiber reinforced polymers. Fiber length and orientation do not only influence the final structural behavior in an anisotropic way, but also the flow field and hence the mold filling process. Therefore, fiber length distribution and fiber breakage modeling are important aspects of an adequate process simulation. For fiber breakage modeling, hydrodynamic forces from matrix on fibers are considered within this work. Knowing the flow field and fiber orientation distributions of the homogenized material, flow-induced hydrodynamic forces on the fibers can be calculated. The fiber orientation tensor is used to determine reference fibers in every element. Based on this information an advanced approach for fiber breakage modelling is proposed. The fiber length distribution in the final part is compared to experimental data of a reactive injection molding process, showing good agreement.
    Keywords Discontinuous fiber reinforced polymers ; fiber breakage ; hydrodynamic forces ; injection molding simulation
    Subject code 621
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online ; Thesis: Mold-filling Simulation of Resin Transfer Molding with Fluid-Structure Interaction

    Seuffert, Julian [Verfasser] / Henning, Frank [Akademischer Betreuer]

    2022  

    Author's details Julian Seuffert ; Betreuer: Frank Henning
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language English
    Publisher KIT-Bibliothek
    Publishing place Karlsruhe
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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  8. Article ; Online: Influence of fiber breakage on flow behavior in fiber length- and orientation-dependent injection molding simulations

    Wittemann, Florian / Kärger, Luise / Henning, Frank

    2022  

    Abstract: Injection molding is one of the most important processes for manufacturing discontinuous fiber reinforced polymers (FRPs). The matrix of FRPs shows a transient chemo-thermomechanical behavior and the fibers create anisotropy influencing physical ... ...

    Abstract Injection molding is one of the most important processes for manufacturing discontinuous fiber reinforced polymers (FRPs). The matrix of FRPs shows a transient chemo-thermomechanical behavior and the fibers create anisotropy influencing physical properties. Hence, FRPs are complex materials, but also likely used in volume production. In this work, the fiber-induced anisotropic behavior during mold filling is modelled with an anisotropic fourth order viscosity tensor. The viscosity tensor takes second and fourth order fiber orientation tensor, fiber length and non-Newtonian matrix viscosity into account. In this way, the macroscopic simulation captures the influence of the flow field on the fiber re-orientation and vice versa. The fiber orientation tensor is used to determine reference fibers in every element for calculation of hydrodynamic forces. This information is used in a novel fiber breakage model, based on buckling of fibers in Jeffery's orbit. The result is a macroscopic molding simulation with not only transient fiber orientation distribution, but also fiber length distribution. Due to the anisotropic viscosity tensor, the predicted fiber breakage influences the material's viscosity and flow behavior, which is also visible in the simulated cavity pressure. The results are validated with injection molding experiments, performed with a glass fiber reinforced phenolic compound, showing good agreement.

    310
    Keywords Anisotropic flow ; Discontinuous fiber reinforced polymers ; Fiber breakage modeling ; Hydrodynamic forces ; Injection molding simulation
    Subject code 621
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Book ; Online ; Thesis: Experimentelle Untersuchungen zur Fluid-Struktur-Interaktion im Wet Compression Molding Prozess

    Albrecht, Fabian [Verfasser] / Henning, Frank [Akademischer Betreuer] / Middendorf, Peter [Akademischer Betreuer]

    2022  

    Author's details Fabian Albrecht ; Frank Henning, Peter Middendorf
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language German
    Publisher KIT-Bibliothek
    Publishing place Karlsruhe
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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  10. Article ; Online: Theoretical approximation of hydrodynamic and fiber-fiber interaction forces for macroscopic simulations of polymer flow process with fiber orientation tensors

    Wittemann, Florian / Kärger, Luise / Henning, Frank

    Fraunhofer ICT

    2021  

    Abstract: Flow processes of discontinuous fiber reinforced polymers (FRPs) are the essence of several polymer-based manufacturing processes. FRPs show a transient chemo-thermomechanical matrix behavior and fiber-induced anisotropic physical properties. Therefore, ... ...

    Abstract Flow processes of discontinuous fiber reinforced polymers (FRPs) are the essence of several polymer-based manufacturing processes. FRPs show a transient chemo-thermomechanical matrix behavior and fiber-induced anisotropic physical properties. Therefore, they are one of the most complex materials used in volume production. The general flow behavior is influenced by fibers and their interactions with the matrix and other fibers. The consideration of individual fibers is numerically not capable for process simulation of FRP parts. Therefore, orientation tensors are used in macroscopic simulations, leading to a loss of information about the fiber network. Within this work, novel approximation schemes are presented to determine hydrodynamic and fiber-fiber contact forces with information provided by the second order fiber orientation tensor. Approximation of these forces can henceforth facilitate fiber breakage modeling in macroscopic process simulations. The results are verified by numerical simulations with individual fibers of different orientation states and lengths, showing good agreement with the verification results.
    Keywords Discontinuous fiber reinforced polymers ; Injection molding simulation ; Fiber-fiber interactions ; Hydrodynamic forces
    Subject code 621
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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