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  1. Article: Investigation of the Damage Phenomenology with Dependence on the Macroporosity and Microporosity of Porous Freeze Foams.

    Maier, Johanna / Werner, David / Geske, Vinzenz / Behnisch, Thomas / Ahlhelm, Mathias / Moritz, Tassilo / Michaelis, Alexander / Gude, Maik

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 6

    Abstract: Freeze Foams are cellular, ceramic structures with hierarchical pore structures that are manufactured using the direct foaming process. By tailoring their morphology and strength, these foam structures are able to cover a wide range of application. ... ...

    Abstract Freeze Foams are cellular, ceramic structures with hierarchical pore structures that are manufactured using the direct foaming process. By tailoring their morphology and strength, these foam structures are able to cover a wide range of application. Earlier works identified that pore-forming influencing factors (water and air content, suspension temperature, as well as pressure reduction rate) dictate the constitution on a macroscopic and microscopic scale. Therefore, the ability to manufacture foams whose properties align with the component requirements would be an important step in advancing towards a widespread application of these promising materials. With this goal in mind, the correlation between the pore-forming influencing factors and the resulting mechanical properties was quantified. Foams with independently adjustable porosities were produced at the micro and macro scales and evaluated according to their material failure behavior under compressive loads. As a result, foams with determined macroporosities between 38 and 62%, microporosities between 25 and 42%, and compression strengths between 1 and 7 MPa with different material failure characteristics were manufactured and systematically investigated.
    Language English
    Publishing date 2023-03-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16062484
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Additive Manufacturing-Based In Situ Consolidation of Continuous Carbon Fibre-Reinforced Polycarbonate.

    Borowski, Andreas / Vogel, Christian / Behnisch, Thomas / Geske, Vinzenz / Gude, Maik / Modler, Niels

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 9

    Abstract: Continuous carbon fibre-reinforced thermoplastic composites have convincing anisotropic properties, which can be used to strengthen structural components in a local, variable and efficient way. In this study, an additive manufacturing (AM) process is ... ...

    Abstract Continuous carbon fibre-reinforced thermoplastic composites have convincing anisotropic properties, which can be used to strengthen structural components in a local, variable and efficient way. In this study, an additive manufacturing (AM) process is introduced to fabricate in situ consolidated continuous fibre-reinforced polycarbonate. Specimens with three different nozzle temperatures were in situ consolidated and tested in a three-point bending test. Computed tomography (CT) is used for a detailed analysis of the local material structure and resulting material porosity, thus the results can be put into context with process parameters. In addition, a highly curved test structure was fabricated that demonstrates the limits of the process and dependent fibre strand folding behaviours. These experimental investigations present the potential and the challenges of additive manufacturing-based in situ consolidated continuous fibre-reinforced polycarbonate.
    Language English
    Publishing date 2021-05-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14092450
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Adhesion Studies during Generative Hybridization of Textile-Reinforced Thermoplastic Composites via Additive Manufacturing.

    Maier, Johanna / Vogel, Christian / Lebelt, Tobias / Geske, Vinzenz / Behnisch, Thomas / Modler, Niels / Gude, Maik

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 14

    Abstract: Generative hybridization enables the efficient production of lightweight structures by combining classic manufacturing processes with additive manufacturing technologies. This type of functionalization process allows components with high geometric ... ...

    Abstract Generative hybridization enables the efficient production of lightweight structures by combining classic manufacturing processes with additive manufacturing technologies. This type of functionalization process allows components with high geometric complexity and high mechanical properties to be produced efficiently in small series without the need for additional molds. In this study, hybrid specimens were generated by additively depositing PA6 (polyamide 6) via fused layer modeling (FLM) onto continuous woven fiber GF/PA6 (glass fiber/polyamide 6) flat preforms. Specifically, the effects of surface pre-treatment and process-induced surface interactions were investigated using optical microscopy for contact angle measurements as well as laser profilometry and thermal analytics. The bonding characteristic at the interface was evaluated via quasi-static tensile pull-off tests. Results indicate that both the bond strength and corresponding failure type vary with pre-treatment settings and process parameters during generative hybridization. It is shown that both the base substrate temperature and the FLM nozzle distance have a significant influence on the adhesive tensile strength. In particular, it can be seen that surface activation by plasma can significantly improve the specific adhesion in generative hybridization.
    Language English
    Publishing date 2021-07-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14143888
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Tailoring of Hierarchical Porous Freeze Foam Structures.

    Werner, David / Maier, Johanna / Kaube, Nils / Geske, Vinzenz / Behnisch, Thomas / Ahlhelm, Matthias / Moritz, Tassilo / Michaelis, Alexander / Gude, Maik

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 3

    Abstract: Freeze foaming is a method to manufacture cellular ceramic scaffolds with a hierarchical porous structure. These so-called freeze foams are predestined for the use as bone replacement material because of their internal bone-like structure and ... ...

    Abstract Freeze foaming is a method to manufacture cellular ceramic scaffolds with a hierarchical porous structure. These so-called freeze foams are predestined for the use as bone replacement material because of their internal bone-like structure and biocompatibility. On the one hand, they consist of macrostructural foam cells which are formed by the expansion of gas inside the starting suspension. On the other hand, a porous microstructure inside the foam struts is formed during freezing and subsequent freeze drying of the foamed suspension. The aim of this work is to investigate for the first time the formation of macrostructure and microstructure separately depending on the composition of the suspension and the pressure reduction rate, by means of appropriate characterization methods for the different pore size ranges. Moreover, the foaming behavior itself was characterized by in-situ radiographical and computed tomography (CT) evaluation. As a result, it could be shown that it is possible to tune the macro- and microstructure separately with porosities of 49-74% related to the foam cells and 10-37% inside the struts.
    Language English
    Publishing date 2022-01-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15030836
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Investigation of the Foam Development Stages by Non-Destructive Testing Technology Using the Freeze Foaming Process.

    Maier, Johanna / Behnisch, Thomas / Geske, Vinzenz / Ahlhelm, Matthias / Werner, David / Moritz, Tassilo / Michaelis, Alexander / Gude, Maik

    Materials (Basel, Switzerland)

    2018  Volume 11, Issue 12

    Abstract: With a novel Freeze Foaming method, it is possible to manufacture porous cellular components whose structure and composition also enables them for application as artificial bones, among others. To tune the foam properties to our needs, we have to ... ...

    Abstract With a novel Freeze Foaming method, it is possible to manufacture porous cellular components whose structure and composition also enables them for application as artificial bones, among others. To tune the foam properties to our needs, we have to understand the principles of the foaming process and how the relevant process parameters and the foam's structure are linked. Using in situ analysis methods, like X-ray microcomputed tomography (µCT), the foam structure and its development can be observed and correlated to its properties. For this purpose, a device was designed at the Institute of Lightweight Engineering and Polymer Technology (ILK). Due to varying suspension temperature and the rate of pressure decrease it was possible to analyze the foam's developmental stages for the first time. After successfully identifying the mechanism of foam creation and cell structure formation, process routes for tailored foams can be developed in future.
    Language English
    Publishing date 2018-12-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma11122478
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Investigation of foam structure formation in the freezing foaming process based on in-situ computed tomography

    Maier, Johanna / Behnisch, Thomas / Geske, Vinzenz / Ahlhelm, Matthias / Werner, David / Moritz, Tassilo / Michaelis, Alexander / Gude, Maik

    2018  

    Abstract: S.584-590 ... Using the so-called Freeze-Foaming method, it is possible to ecologically create ceramic cellular scaffolds without a need for pore creators or organic scaffolds. One of their main applications can be found in the medical sector. Tailoring ... ...

    Abstract S.584-590

    Using the so-called Freeze-Foaming method, it is possible to ecologically create ceramic cellular scaffolds without a need for pore creators or organic scaffolds. One of their main applications can be found in the medical sector. Tailoring these ceramic foams for certain applications requires a defined and reproducible adjustment of their pores and pore morphology. This paper examines the foaming process depending on its process parameters and the used material. In-situ x-ray computed tomography in combination with a specially designed setup for examining the foaming process allowed us to hold the stage of the foam in different phases of development and to analyse the changes in microstructure between each process phase. In this contribution we present the first findings for the production of ceramic foams depending on different process parameters.

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    Keywords freeze foaming ; bioceramics ; foaming process ; in-situ CT ; none destructive testing ; 620 ; 666
    Subject code 660
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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