@phdthesis{52499, author = {{Gräßer, Melanie}}, pages = {{225}}, title = {{{Numerical Computation of Capillary Bridges between Directly Resolved Rough Interfaces}}}, doi = {{10.17619/UNIPB/1-1691}}, year = {{2023}}, } @misc{52623, author = {{Peper, Frederik}}, pages = {{80}}, title = {{{Der Einfluss verschiedener Luftfilter auf die Geräuschemissionen von Personenkraftwagen}}}, year = {{2023}}, } @misc{52630, author = {{Wiebe, Robert}}, title = {{{Qualifizierung des kyrogenen Mahlens zur Herstellung von gefüllten Kunststoffpulvern für das Lasersinterverfahren (Studienarbeit)}}}, year = {{2023}}, } @misc{52632, author = {{Aissani, Soufiane}}, title = {{{Polystyrol Nanopartikel asl alternative Fließhilfsmittel für SLS Materialien (Studienarbeit)}}}, year = {{2023}}, } @misc{52627, author = {{Middelmann, Steffen}}, title = {{{Der Einfluss verschiedener Partikelgrößenfraktionen eines PA12 Pulvers auf den Lasersinterprozess und auf die resultierenden Bauteileigenschaften}}}, year = {{2023}}, } @misc{52629, author = {{Schröder, Dominik}}, title = {{{Untersuchung und Modellierung der Materialeigenschaften von lasergesintertem Polyamid 11 Pulver mit eincompoundierten Carbonfasern}}}, year = {{2023}}, } @misc{52628, author = {{Baaske, Benno}}, title = {{{Schmelze-Temperatur-Messung im Lasersinter-Prozess und Korrelation zu temperaturabhängigen Schmelzviskositäten}}}, year = {{2023}}, } @misc{52633, author = {{Gröne, Sebastian}}, title = {{{Numerical Investigations on the Flow Field and the Transfer Function of a Centrifugal-DMA}}}, year = {{2023}}, } @misc{52634, author = {{Otto, Moritz}}, title = {{{Konstruktion einer Vorrichtung zur Probenherstellung für das Sentmanat-Dehnrheometer}}}, year = {{2023}}, } @misc{52635, author = {{Reimer, Jens}}, title = {{{Entwicklung einer Datenbank hergestellter Nanomaterialien mittel Gasphasensynthese (Studienarbeit)}}}, year = {{2023}}, } @misc{52624, author = {{Schulenkorf, Steffen}}, title = {{{Materialqualifizierung und Nachhaltigkeitsanalyse eines biobasierten Polyamid 11-Pulvers für das selektive Lasersintern}}}, year = {{2023}}, } @misc{52626, author = {{Bürckner, Lorena Marie}}, title = {{{Entwicklung eines Verfahrens zur Probeentnahme aus einem Pulverkuchen im SLS-Prozess}}}, year = {{2023}}, } @misc{52625, author = {{Engemann, Julian}}, title = {{{Studie zum Auftragsverhalten von SLS-Pulvern in Abhängigkeit ihrer Fließfähigkeit}}}, year = {{2023}}, } @misc{51663, author = {{Hormatallah, Mouhssine and Ponusamy, SathishKumar}}, title = {{{Untersuchungen zum Einfluss der Pulverkonzentration auf den dynamischenmechanischen Partikelverrundungsprozess (Studienarbeit)}}}, year = {{2023}}, } @misc{51661, author = {{Tappe, Daniel and Ponusamy, SathishKumar}}, title = {{{Leistungsbedarf beim dynamisch - mechanischen Partikelverrundungsprozess (Studienarbeit)}}}, year = {{2023}}, } @inproceedings{51218, abstract = {{Polymer composites represent the industry standard in injection molding for the production of plastic components with increased requirements in terms of heat resistance and stiffness. In the field of laser sintering (LS), these materials are less common so far. In order to extend the available material variety for the LS process, new ceramic-filled Polyamide 613 powders are investigated within the scope of this work. Here, the resulting properties from two different powder production methods are compared. One filled powder is produced by dry blending and the other powder with the same filler and filling ratio is produced by encapsulating the filler particles inside the polymer particles within the dissolution-precipitation process. It was found that encapsulating the filler particles can provide certain benefits for the processability, for example an improved powder flowability or better filler dispersion. However, encapsulating the filler also alters the thermal properties of the precipitated powder. }}, author = {{Kletetzka, Ivo and Neitzel, Fabian and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium}}, editor = {{Beaman, Joseph}}, keywords = {{Additive Manufacturing, Laser Sintering, Filled Materials, Composites, Polyamide 613}}, location = {{Austin}}, title = {{{Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide Composites made by Laser Sintering}}}, doi = {{https://doi.org/10.26153/tsw/50931}}, year = {{2023}}, } @inproceedings{46862, abstract = {{The high flammability of components manufactured by laser sintering (LS) using standard polyamide 12 (PA12) powder still severely restricts their use in industries such as electronics, aviation, and transportation. A key factor for the further establishment of LS is the expansion of the material portfolio with, for example, refreshable and halogen-free flame-retardant (FR) powder materials. Accordingly, various halogen-free FRs are investigated in this work and evaluated with respect to their use in LS. First, their decomposition behavior and mode of action are examined. Subsequently, the additives are dry blended with PA12 to investigate properties relevant for LS, such as particle morphology, thermal behavior and melt viscosity. Afterwards, test specimens for UL94 vertical flame-retardancy tests are produced by processing the dry blends on an EOS P3 LS system. Finally, the process stability of the process-aged powder blends is investigated by again examining the thermal behavior and melt viscosity.}}, author = {{Neitzel, Fabian and Kletetzka, Ivo and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium}}, editor = {{Beaman, Joseph}}, keywords = {{Additive Manufacturing, Laser Sintering, Flame Retardant, Polyamide 12}}, location = {{Austin}}, title = {{{Halogen-Free Flame Retardant Powder Materials for Laser Sintering: Evaluation and Process Stability Analysis}}}, doi = {{https://doi.org/10.26153/tsw/50926}}, year = {{2023}}, } @misc{54389, author = {{Bürckner, Lorena Marie}}, title = {{{Entwicklung eines Verfahrens zur Probenentnahme aus einem Pulverkuchen im SLS-Prozess}}}, year = {{2023}}, } @misc{44100, author = {{Gunasagran, Sharin Kumar and Neukötter, Moritz}}, title = {{{Automatisierung der Auswertung rheologischer Messungen (Studienarbeit)}}}, year = {{2023}}, } @article{36983, abstract = {{AbstractThe use of structured measuring systems to prevent wall slip is a common approach to obtain absolute rheological values. Typically, only the minimum distance between the measuring surfaces is used for further calculation, implying that no flow occurs between the structural elements. But this assumption is misleading, and a gap correction is necessary. To determine the radius correction $$\Delta r$$ Δ r for specific geometries, we conducted investigations on three Newtonian fluids (two silicon oils and one suspension considered to be Newtonian in the relevant shear rate range). The results show that $$\Delta r$$ Δ r is not only shear- and material-independent, but geometry-dependent, providing a Newtonian flow behaviour in a similar viscosity range. Therefore, a correction value can be determined with only minute deviations in different Newtonian fluids. As the conducted laboratory measurements are very time-consuming and expensive, a CFD-approach with only very small deviations was additionally developed and compared for validation purposes. Therefore, simulation is an effective and resource-efficient alternative to the presented laboratory measurements to determine $$\Delta r$$ Δ r for the correction of structured coaxial geometries even for non-Newtonian fluids in the future.}}, author = {{Josch, Sebastian and Jesinghausen, Steffen and Dechert, Christopher and Schmid, Hans-Joachim}}, issn = {{0035-4511}}, journal = {{Rheologica Acta}}, keywords = {{rheology, rheometry, suspension, coaxial, correction}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Experimental and simulative determination and correction of the effective gap extension in structured coaxial measuring systems}}}, doi = {{10.1007/s00397-023-01383-2}}, year = {{2023}}, }