Research in material development, design, and innovative processing of polymer materials. The research focus is Lightweight structures, Additive Manufacturing, Polymers in electric/electronic and medical applications, and machine elements.
Research projects
Functional (Bio)Polymers
Implants
Additive Manufacturing
Fiber-reinforced plastics
Polymer Bonded Magnets
Tribology and polymeric machine elements
Current projects Current projects
Hochpräzise Bipolarplatten im dynamisch temperierten Spritzprägen
(Third Party Funds Single)
Term: since 1. January 2023Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
Um die dringend notwendigen Kosten- und Lebensdauervorteile der Kunststoffe im Vergleich zu metallischen Werkstoffen für die Anwendung der Bipolarplatten zu erschließen, sind hohe Füllstoffgehalte zur Erzielung ausreichend hoher elektrischer Leitfähigkeit notwendig. Derart modifizierte Thermoplastschmelzen zeigen jedoch aufgrund einer deutlich erhöhten Viskosität sowie des negativen Effekts erhöhter Schmelzewärmeleitfähigkeit ein verschlechtertes Abbildungs- und Formfüllungsverhalten. Dies resultiert in Limitationen in den möglichen Dickenabmessungen sowie der Abformung feiner Kanalstrukturen bisheriger Bipolarplattengeometrien im Spritzgussprozess. Da die Ausgangsspannung pro Zelle lediglich max. 1,23 V beträgt, sind für höhere Spannungen mehrere in Reihe geschaltete Zellen erforderlich, was bei dickeren Bipolarplatten aus Kunststoff-Compound darüber hinaus erheblich größere Bauraumvolumina und Kosten verursacht. Die daher angestrebte Reduktion der Plattendicke kann nur bedingt durch höhere Einspritzgeschwindigkeiten und Werkzeugtemperaturen im Spritzgussprozess erreicht werden, da dies aufgrund des verringerten Fließquerschnitts unabhängig von der Art der Werkzeugtemperaturführung in zu hohem Druckbedarf während der Füllung sowie inhomogenen Druck- und Temperaturfeldern über den Fließweg resultiert. Dies zeigt sich auf Bauteilebene in einer verschlechterten, fließwegabhängigen Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen. Neben Abbildungsproblemen zeigen hochgefüllte Kunststoffbauteile auch ein ausgeprägt richtungsabhängiges mechanisches und elektrisches Bauteilverhalten, welches maßgeblich von den Temperatur-Druck-Scherbedingungen im Prozess bestimmt wird. Ziel des Projekts ist daher der Erkenntnistransfer der analytischen und experimentellen Auslegung der benötigten Zeit-Temperatur-Druck-Scherbedingungen im dynamisch temperierten Spritzprägen zur Realisierung von dünnwandigen und hochgefüllten Bipolarplatten mit höchstmöglicher Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen bei gleichzeitig optimierten elektrischen und mechanischen Eigenschaften. Hierbei soll die Fließfähigkeit der Kunststoffschmelze während des Urformprozesses durch die dynamische Werkzeugtemperaturführung aufrechterhalten werden. Die Kombination dieser modernen Verfahrensstrategie mit einem Prägeprozess erlaubt die flächige Nachdruckwirkung und Realisierung hoher Plattenaspektverhältnisse bei gleichzeitig höchstmöglicher Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen über den Fließweg. Durch die Kontrolle von Temperatur und Druck sowie die indirekte Einflussnahme auf die Scherung im Prozess können die bestehenden Kenntnisse zur prozessseitigen Beeinflussung elektrischer und mechanischer Bauteileigenschaften zudem in den Fertigungsprozess des dynamisch temperierten Spritzprägens übersetzt werden, um das Werkstoffpotential optimal auszunutzen.
Recycling von Magnetwerkstoffen für die Verwendung in kunststoffgebundenen Dauermagneten
(Third Party Funds Single)
Term: 27. September 2022 - 26. September 2024Funding source: Deutsche Bundesstiftung Umwelt
Additive Fertigung von Antennen durch die Verarbeitung hochfrequenztauglicher Kunststoffe
(Third Party Funds Single)
Term: 1. July 2022 - 30. June 2024Funding source: Bundesministerium für Wirtschaft und Klimaschutz (BMWK)
Textile Recycling Excellence
(Third Party Funds Group – Sub project)
Overall project: Textile Recycling EXcellenceTerm: 31. May 2022 - 31. May 2025Funding source: Europäische Union (EU)
Less than 1 % of materials used to produce clothing is recycled into new clothing. From January 2025, a directive requires 27 Member States to implement a separate household textile waste collection scheme and comply with rising minimum recycling objectives. Legislation is not enough to deal with the issue. Creating a circular system for post-consumer textile waste faces many challenges, including a lack of EU-wide standards for collecting and sorting textile waste across countries, inaccurate composition claims, variable material quality and a lack of reliable data across value chain stakeholders. The EU-funded T-REX project aims to demonstrate how household textile waste can become a new feedstock and business model for the textile industry by engaging key actors across the entire value chain.
Keramische Schaumstoffmaterialien für erhöhte Bauteilfunktionalitäten und ressourceneffiziente Produktionsprozesse; Teilvorhaben: Erforschung von Keramikfeedstocks zur Herstellung poröser Keramikstrukturen mit Hilfe thermoplastischer Formgebungsverfahren
(Third Party Funds Single)
Term: 1. April 2022 - 31. March 2025Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Metal Filament Modeling - Feedstocks mit Werkzeugstählen für den 3D-Druck (HiFil3D); Teilprojekt: Metal Filament Modeling - Herstellung hochgefüllter und homogener Metall-Feedstocks für den 3D-Druck
(Third Party Funds Group – Sub project)
Overall project: Metal Filament Modeling - Feedstocks mit Werkzeugstählen für den 3D-DruckTerm: 1. August 2021 - 31. July 2024Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Zuverlässige Folienkondensatoren mit erhöhtem Leistungspotential
(Third Party Funds Single)
Term: 1. February 2021 - 31. January 2024Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Optimierte Materialien für das vakuumunterstützte Schäumen in Rotationsformen (Vacuum Assistet ROtational FOam MOlding)
(Third Party Funds Single)
Term: 1. January 2021 - 31. December 2023Funding source: Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie (StMWi) (seit 2018)
Thermoset-bonded injection-molded magnets with defined structure of magnetization
(Third Party Funds Single)
Term: 1. January 2021 - 31. December 2023Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
Tool Additive Arm zur Fertigung ressourceneffizienter Leichtbaustrukturen im Fahrzeugbau
(Third Party Funds Single)
Term: 1. January 2021 - 31. December 2023Funding source: Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie (StMWi) (seit 2018)
Process strategies for the production of thin-walled components during selective laser beam melting of plastics
(Third Party Funds Group – Sub project)
The aim of theproject is the systematic investigation of the process-geometry-interaction ofthin-walled components for the production of locally adapted properties as wellas the modeling of this effect in finite element simulations and structuraloptimization. In experimental tests, the main influencing factors areidentified and mapped in relation to the building position in the process. Newexposure technologies and strategies are used to manipulate the melting pooland homogenize component properties. The findings are incorporated into a wallthickness dependent material model for structural optimization, which isinvestigated in the project. The participating industrial partners willvalidate the results over the course of the project. The experimental findingsand the wall thickness dependent material model will be used to develop amethodology for the product development of thin-walled structures. In thefuture, the product development process can be accelerated, and the economicefficiency increased. Based on these findings, new application areas for theselective laser beam melting of plastics can be opened up in the future.
Funktion by Desgin: Cellular Hybrids - Eine Route zur Biologisierung der Materialwissenschaften
(Third Party Funds Single)
Term: 1. January 2021 - 31. December 2025Funding source: Bayerisches Staatsministerium für Wissenschaft und Kunst (StMWK) (seit 2018)
Joining by using pin-like structures in welding processes
(Third Party Funds Single)
Term: 1. October 2020 - 30. September 2023Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
The use of pin-like structures for the generation of form-fit joints in welding processes represents an innovative approach to combine adhesion incompatible polymers and thus broadens the possible polymer combination spectrum. Without the use of additives or extensive surface pre-treatments, locally adapted part properties can be achieved by joining incompatible semi-crystalline thermoplastics. In addition, the use of pin-like structures allows the combination of semi-crystalline and amorphous thermoplastics, to enable for example a permanent functionalization by an optically transparent element. Besides joining adhesion incompatible polymers, the benefits of the process can be applied on bonds with low weld strength, e.g. fibre-reinforced thermoplastics. In this case, the pin-like structures could contribute to a modification of the fibre orientation, perpendicular to the joining plane, and thus to higher bond strengths.The aim of the proposed project is the fundamental investigation of interdependencies of the joining mechanism by means of pin-like structures in welding processes. For this purpose, vibration welding as well as ultrasonic welding technology are applied, which are both based on energy input by means of friction. Despite the high potential, interdependencies between material, process and resulting bond properties are currently unknown for this novel joining technique. The comprehensive experimental investigations within the research project, in combination with a model-based analysis, enable the development of general requirements for the material combinations as well as for the process handling. Therefore, the effects of decisive process parameters, of the structure geometry as well as of the occurring thermomechanical interactions on the resulting joint are fundamentally analysed.In comparison to the vibration welding technology, the use of the ultrasonic welding technology enables the production of smaller pin structures whereby the load capacity of the joint can be increased and the process can also be made accessible for smaller parts. Furthermore, ultrasonic welding continues to differentiate itself from the vibration welding principle since different oscillation directions are used for the energy input and the structure generation. This allows an improved identification of process-specific interactions during structuring.With the help of the knowledge gained within this project, a comprehensive understanding of the joining by means of pin-like structures as well as general structuring and joining strategies can be established. These allow the transfer of the methodology to further materials and joining processes.
Recent publications Recent publications
2023
Baumgärtner, B., Rothfelder, R., Greiner, S., Breuning, C., Renner, J., Schmidt, M.,... Hausotte, T. (2023). Evaluation of Additively-Manufactured Internal Geometrical Features Using X-ray-Computed Tomography . Journal of Manufacturing and Materials Processing . https://dx.doi.org/10.3390/jmmp7030095
Cholewa, S., Jaksch, A., & Drummer, D. (2023). Structure Development of Semi-crystalline Polymers in Laser Based Powder Bed Fusion . In Proceedings of the Antec 2023 . Denver, Colorado, US.
Cholewa, S., Stieglitz, L., Jaksch, A., Rieger, B., & Drummer, D. (2023). Tailored Syndiotactic Polypropylene Feedstock Material for Laser-Based Powder Bed Fusion of Polymers: Material Development and Processability . ACS Applied Polymer Materials . https://dx.doi.org/10.1021/acsapm.2c02112
Dong, Y., Jiang, B., Qiang, J., Ma, Z., Drummer, D., & Zhang, L. (2023). Tuning formation process of void defects in microcolumn arrays via pulse reverse electrodeposition . Journal of Materials Research and Technology , 24 , 3055-3066. https://dx.doi.org/10.1016/j.jmrt.2023.03.201
Drummer, D., Schlicht, S., & Greiner, S. (2023). Additive Manufacturing of Functionalized Material Systems for Medical Applications: Potentials and Challenges in Additive Manufacturing . In Additive Manufacturing in Multidisciplinary Cooperation and Production (pp. 253-263). Maribor, Slowenien, SI: Cham: Springer Publishing AG.
Greiner, S., Schlicht, S., & Drummer, D. (2023). Understanding geometry dependent temperature fields in laser powder bed fusion of PA12 by means of infrared thermal imaging . In Additive Manufacturing in Multidisciplinary Cooperation and Production (pp. 15-23). Maribor, Slowenien, SI: Cham: Springer Publishing AG.
Herzog, C., & Drummer, D. (2023). Influence of the injection molding process on the tooth deflection of plastic gears during operation . In VDI Wissensforum GmbH (Eds.), Proceedings of the 5th International Conference on High Performance Plastic Gears 2023 (pp. 1435 - 1448). Garching/ Munich, DE: Düsseldorf: VDI-Verlag GmbH.
Herzog, C., & Drummer, D. (2023). Limitations of the Check Calculation for Tooth Deformation of
Plastic Gears According to Gear Design Guideline VDI 2736 . Polymers , 15 (3809). https://dx.doi.org/doi.org/10.3390/polym15183809
Herzog, C., & Drummer, D. (2023). Test Rig for The In Situ Measurement of The Elastic Tooth
Deflection of Plastic Gears . Polymers , 15 . https://dx.doi.org/10.3390/polym15071732
Hesse, N., Jaksch, A., Kaschta, J., Groh, D., Drummer, D., Peukert, W., & Schmidt, J. (2023). From trash to treasure in additive manufacturing: Recycling of polymer powders by acid catalyzed hydrolysis . Additive Manufacturing , 71 . https://dx.doi.org/10.1016/j.addma.2023.103591
Lotter, S., Brand, L., Jamali, V., Schäfer, M., Loos, H., Unterweger, H.,... Schober, R. (2023). Experimental Research in Synthetic Molecular Communications - Part I . IEEE Nanotechnology Magazine , 1-12. https://dx.doi.org/10.1109/MNANO.2023.3262100
Lotter, S., Brand, L., Jamali, V., Schäfer, M., Loos, H.M., Unterweger, H.,... Schober, R. (2023). Experimental Research in Synthetic Molecular Communications - Part II . IEEE Nanotechnology Magazine , 1-12. https://dx.doi.org/10.1109/MNANO.2023.3262377
Lu, Z., Wu, W., Drummer, D., Wang, Y., Liu, C., Li, S., & Zhao, X. (2023). ZnO nanowire-decorated Al2O3/graphene aerogel for improving the thermal conductivity of epoxy composites . Polymer Composites . https://dx.doi.org/10.1002/pc.27313
Ma, Z., Jiang, B., Dong, Y., Qiang, J., Drummer, D., & Zhang, L. (2023). Electrodeposition model with dynamic ion diffusion coefficients for predicting void defects in electroformed microcolumn arrays . Physical Chemistry Chemical Physics . https://dx.doi.org/10.1039/d2cp05396a
Natale, R., & Drummer, D. (2023, March). Improving the optical properties of achromatic lenses due to the process conditions .
Popp, J., Busch, M., Hausotte, T., & Drummer, D. (2023). Fiber Orientation in continuous fiber reinforced thermoplastics/metal hybrid joining via multi-pin arrays . Science and Engineering of Composite Materials , 30 (1). https://dx.doi.org/10.1515/secm-2022-0165
Popp, J., Wolf, M., & Drummer, D. (2023). Fügen thermoplastischer Faserverbunde über Pin-Strukturen mit variablen Prozessrouten . Werkstoffe in der Fertigung .
Popp, J., Zirngibl, C., Schleich, B., Wartzack, S., & Drummer, D. (2023). Influence of geometrical parameters of conic pin structures in thermoplastic composite/steel hybrid joining . In Marion Merklein, Hinnerk Hagenah, Joost R. Duflou, Livan Fratini, Fabrizio Micari, Paulo Martins, Gerson Meschut (Eds.), Materials Research Proceedings (pp. 117-124). Erlangen, DEU: Association of American Publishers.
Qiang, J., Jiang, B., Dong, Y., Yang, L., Drummer, D., & Zhang, L. (2023). Tuning residual stress in electrodeposited nickel films via pulse current . Surfaces and Interfaces , 40 . https://dx.doi.org/10.1016/j.surfin.2023.103038
Rösel, U., & Drummer, D. (2023). Correlation between the Material System and the Magnetic Properties in Thermoset-Based Multipolar Ring Magnets . Magnetism , 3 , 226-244. https://dx.doi.org/10.3390/magnetism3030018
Rösel, U., & Drummer, D. (2023). Extension of the Application Range of Multipolar Bonded Ring Magnets by Thermosets in Comparison to Thermoplastics . Magnetism , 3 , 71-89. https://dx.doi.org/10.3390/magnetism3010007
Rösel, U., & Drummer, D. (2023). Rotor-integrierte Dauermagnete – Spritzguss in der Antriebstechnik . In Tagungsband VDI Fachtagung Spritzgießen .
Rösel, U., Kneidl, M., Franke, J., & Drummer, D. (2023). Improving the integrated fabrication of insulation systems in electric drives by injection molding of thermosets due to processing conditions and slot design . Polymers , 1-20. https://dx.doi.org/10.3390/polym15051165
Schlicht, S., Cholewa, S., & Drummer, D. (2023). Process-Structure-Property Interdependencies in Non-Isothermal Powder Bed Fusion of Polyamide 12 . Journal of Manufacturing and Materials Processing , 7 (1). https://dx.doi.org/10.3390/jmmp7010033
Schlicht, S., & Drummer, D. (2023). Accelerated Powder Bed Fusion of Polypropylene Using Superposed Fractal Exposure Strategies . In Additive Manufacturing in Multidisciplinary Cooperation and Production (pp. 3-14). Maribor, SI: Springer International Publishing AG.
Schlicht, S., & Drummer, D. (2023). Eutectic In Situ Modification of Polyamide 12 Processed through Laser-Based Powder Bed Fusion . Materials , 16 (5). https://dx.doi.org/10.3390/ma16052050
Schlicht, S., & Drummer, D. (2023). Thermal Intra-Layer Interaction of Discretized Fractal Exposure Strategies in Non-Isothermal Powder Bed Fusion of Polypropylene . In Proceedings of the EMPOrIA - International Joint Conference 2023 . Aachen, DE.
Schlicht, S., & Drummer, D. (2023). Thermal Intra-Layer Interaction of Discretized Fractal Exposure Strategies in Non-Isothermal Powder Bed Fusion of Polypropylene . Journal of Manufacturing and Materials Processing , 7 (2). https://dx.doi.org/10.3390/jmmp7020063
Schubert, D., Wolf, M., & Drummer, D. (2023). Interaction of tool and process design on the mechanical and tribological behaviour of an injection-moulded polyamide-steel gear set . Polymer Testing , 107982. https://dx.doi.org/10.1016/j.polymertesting.2023.107982
Tischer, F., Cholewa, S., Düsenberg, B., Drummer, D., Peukert, W., & Schmidt, J. (2023). Polyamide 11 nanocomposite feedstocks for powder bed fusion via liquid-liquid phase separation and crystallization . Powder Technology , 424 . https://dx.doi.org/10.1016/j.powtec.2023.118563
Werner, J., & Drummer, D. (2023). Influence of particle geometry and size on the cell morphology of vacuum assisted rotationally molded foam . Cellular Polymers , Online First . https://dx.doi.org/10.1177/02624893231171662
Wolf, M., Kleffel, T., & Drummer, D. (2023). Functionalization of series components by joining laser-sintered with injection-molded parts: Weld seam characteristics in vibration welding . Composites and Advanced Materials , 32 . https://dx.doi.org/10.1177/26349833231165320
Yuan, S., Zhou, M., Liu, X., Li, Q., Drummer, D., & Jiang, B. (2023). Investigation of parameters and porous plug enhanced enrichment with field-amplified sample stacking in microchip . Physics of Fluids , 35 (1). https://dx.doi.org/10.1063/5.0135314
Zhao, X., Wu, W., Drummer, D., Wang, Y., Cui, S., Liu, C.,... Chen, Q. (2023). SiC Nanowires Bridged Graphene Aerogels with a Vertically Aligned Structure for Highly Thermal Conductive Epoxy Resin Composites and Their Mechanism . ACS Applied Electronic Materials . https://dx.doi.org/10.1021/acsaelm.3c00015
2022
Cholewa, S., & Drummer, D. (2022). Crystallization behavior under process conditions in Powder Bed Fusion of polymers . In M. Schmidt, F. Vollertsen, B.M. Colosimo (Eds.), Procedia CIRP (pp. 23-27). Erlangen, DEU: Elsevier B.V..
Cholewa, S., & Drummer, D. (2022). Prozessnahe simultane Bestimmung des Kristallisations- und Fließverhaltens von PA 12 im Lasersintern . In Tagungsband Rapid.Tech 3D Druck . Erfurt, DE.
Cholewa, S., Jaksch, A., & Drummer, D. (2022). Coalescence behavior of polyamide 12 as function of zero-shear viscosity and influence on mechanical performance . In Proceedings of the SFF 2022 . Austin, Texas, US.
Drummer, D., Greiner, S., Grützmacher, C., Jiang, F., Kleffel, T., Romeis, M.,... Wolf, M. (2022). Neue Werkstoffe und Prozesse für die additive Fertigung . Jahresmagazin Ingenieurwissenschaften .
Greiner, S., & Drummer, D. (2022). Understanding aspect ratio effects in Laser Powder Bed Fusion of polyamide 12 by means of infrared thermal imaging . In M. Schmidt, F. Vollertsen, B.M. Colosimo (Eds.), Procedia CIRP (pp. 253-256). Erlangen, DE: Elsevier B.V..
Herzog, C., Wolf, M., & Drummer, D. (2022). In Situ Measured Tooth Flank Wear of Plastic Gears under Spectrum Loading . Polymers , 14 , 5239. https://dx.doi.org/10.3390/polym14235239
Herzog, C., Wolf, M., Schubert, D., & Drummer, D. (2022). In situ investigation of the influence of varying load conditions on tooth deformation and wear of polymer gears . Forschung Im Ingenieurwesen-Engineering Research . https://dx.doi.org/10.1007/s10010-022-00591-1
Jaksch, A., Cholewa, S., & Drummer, D. (2022). Understanding geometry dependent part behavior of thin walled structures in powder bed fusion of polymers . In M. Schmidt, F. Vollertsen, B.M. Colosimo (Eds.), Procedia CIRP (pp. 28-32). Erlangen, DEU: Elsevier B.V..
Jiang, F., & Drummer, D. (2022). Analysis of UV Curing Strategy on Reaction Heat Control and Part Accuracy for Additive Manufacturing . Polymers , 14 (4). https://dx.doi.org/10.3390/polym14040759
Jiang, F., Wörz, A., Romeis, M., & Drummer, D. (2022). Analysis of UV-Assisted direct ink writing rheological properties and curing degree . Polymer Testing , 105 . https://dx.doi.org/10.1016/j.polymertesting.2021.107428
Jiang, F., Zhou, M., & Drummer, D. (2022). Effects of Fumed Silica on Thixotropic Behavior and Processing Window by UV-Assisted Direct Ink Writing . Polymers , 14 (15). https://dx.doi.org/10.3390/polym14153107
Meschut, G., Merklein, M., Brosius, A., Drummer, D., Fratini, L., Füssel, U.,... Wolf, M. (2022). Review on mechanical joining by plastic deformation . Journal of Advanced Joining Processes . https://dx.doi.org/10.1016/j.jajp.2022.100113
Ott, C., & Drummer, D. (2022). In-situ leakage behavior of polymer-metal hybrids under mechanical load . International Polymer Processing . https://dx.doi.org/10.1515/ipp-2022-4229
Ott, C., & Drummer, D. (2022). Reducing component stress during encapsulation of electronics: a simulative examination of thermoplastic foam injection molding . Journal of Polymer Engineering . https://dx.doi.org/10.1515/polyeng-2022-0150
Popp, J., & Drummer, D. (2022). Joining of continuous fiber reinforced thermoplastic/steel hybrid parts via undercutting pin structures and infrared heating . Journal of Advanced Joining Processes , 5 . https://dx.doi.org/10.1016/j.jajp.2021.100084
Popp, J., & Drummer, D. (2022). Joining of steel/CFRT-hybrid parts via non-rotational symmetric cold formed pin structures . In Proceedings of the Hybrid 2022 . Leoben.
Popp, J., Römisch, D., Merklein, M., & Drummer, D. (2022). Joining of CFRT/Steel Hybrid Parts via Direct Pressing of Cold Formed Non-Rotational Symmetric Pin Structures . Applied Sciences , 12 . https://dx.doi.org/10.3390/app12104962
Roth, B., & Drummer, D. (2022). Druckabhängige Orientierungsrelaxation im dynamisch temperierten Spritzprägen . Zeitschrift Kunststofftechnik , 1 , 1-23. https://dx.doi.org/10.3139/o999.01012022
Roth, B., Frank, R., Kleffel, T., Schneider, K., & Drummer, D. (2022). High-Precision Thin Wall Bipolar Plates for Fuel Cell Applications via Injection Compression Molding with Dynamic Mold Temperature Control . Polymers , 14 (14). https://dx.doi.org/10.3390/polym14142799
Rösel, U., & Drummer, D. (2022). Possibilities in Recycling Magnetic Materials in Applications of Polymer-Bonded Magnets . Magnetism , 2 , 251-270. https://dx.doi.org/10.3390/magnetism2030019
Rösel, U., & Drummer, D. (2022). Simulationsgestützte Auslegung eines Spritzgießwerkzeugs zur Herstellung von kunststoffgebundenen Dauermagneten auf Duroplast Basis . Werkstoffe in der Fertigung , 22-26.
Rösel, U., & Drummer, D. (2022). Understanding the Effect of Material Parameters on the Processability of Injection-Molded Thermoset-Based Bonded Magnets . Magnetism , 2 , 211-228. https://dx.doi.org/10.3390/magnetism2030016
Rösel, U., Kneidl, M., Drummer, D., & Franke, J. (2022). Possibilities of Integrated Fabrication of Insulation Systems in Electric Drives by Injection Molding of Thermosets . Polymers , 14 , 5352. https://dx.doi.org/10.3390/polym14245352
Schlicht, S., Greiner, S., & Drummer, D. (2022). Low Temperature Powder Bed Fusion of Polymers by Means of Fractal Quasi-Simultaneous Exposure Strategies . Polymers , 14 (7). https://dx.doi.org/10.3390/polym14071428
Schlicht, S., Jaksch, A., & Drummer, D. (2022). Inline Quality Control through Optical Deep Learning-Based Porosity Determination for Powder Bed Fusion of Polymers . Polymers , 14 (5). https://dx.doi.org/10.3390/polym14050885
Schneider, K., Gothe, B., Drexler, M., Siltamaeki, J., Weiger, H., Seefried, A., & Drummer, D. (2022). The effect of dielectric and thermal properties of plastic mold materials on the high frequency welding of three-dimensional foam components . Polymer Engineering and Science . https://dx.doi.org/10.1002/pen.26112
Schubert, D., Herzog, C., & Drummer, D. (2022). In Situ Test Rig for the Measurement of the Operating Characteristics of Polymer Gears . Zeitschrift Kunststofftechnik , 1 , 93-116. https://dx.doi.org/10.3139/O999.02022022
Schubert, D., Rohrmoser, A., Herzog, C., Wolf, M., Hagenah, H., Merklein, M., & Drummer, D. (2022). Influence of production process-induced surface topologies at varying roughness depths on the tribological properties of polyamide steel contact . Journal of Polymer Engineering . https://dx.doi.org/10.1515/polyeng-2022-0231
Tomiak, F., & Drummer, D. (2022). The Impact of beta-Radiation Crosslinking on Flammability Properties of PA6 Modified by Commercially Available Flame-Retardant Additives . Polymers , 14 (15). https://dx.doi.org/10.3390/polym14153168
Tomiak, F., Schneider, K., Schoeffel, A., Rathberger, K., & Drummer, D. (2022). Expandable Graphite as a Multifunctional Flame-Retarding Additive for Highly Filled Thermal Conductive Polymer Formulations . Polymers , 14 (8). https://dx.doi.org/10.3390/polym14081613
Tomiak, F., Schoeffel, A., Rathberger, K., & Drummer, D. (2022). Expandable Graphite, Aluminum Diethylphospinate and Melamine Polyphosphate as Flame Retarding System in Glass Fiber-Reinforced PA6 . Polymers , 14 (6). https://dx.doi.org/10.3390/polym14061263
Wittmann, L.-M., & Drummer, D. (2022). Mechanical properties of thermoformed multilayer parts containing non thermoformable materials . Journal of Plastic Film & Sheeting , 875608792210939. https://dx.doi.org/10.1177/87560879221093977
Wittmann, L.-M., & Drummer, D. (2022). Two Layer Sheets for Processing Post-Consumer Materials . Polymers , 14 (8). https://dx.doi.org/10.3390/polym14081507
Wittmann, L.-M., Kaschta, J., & Drummer, D. (2022). Biaxial Elongation Behavior in Partially Molted State of Two-Layer Sheets Containing Postconsumer Material . Polymers , 14 , 3172. https://dx.doi.org/10.3390/polym14153172
Wolf, M., Beiß, T., & Drummer, D. (2022). Neuartiges Werkzeugkonzept zum Schweißen von komplexen Bauteilen aus Kunststoffen in Klein- und Kleinstserien . Konstruktion , 74 (10), 70-74. https://dx.doi.org/10.37544/0720-5953-2022-10-70
Wolf, M., Beiß, T., & Drummer, D. (2022). Neuartiges Werkzeugkonzept zum Schweißen von komplexen Bauteilen aus Kunststoffen in Klein- und Kleinstserien . Konstruktion , 10 , 70-74.
Wolf, M., & Drummer, D. (2022). Filling Behavior in Joining Using Pin-like Structures . Polymers , 14 , 3083. https://dx.doi.org/10.3390/polym14153083
Wolf, M., & Drummer, D. (2022). Separation of Multi-Material Polymer Combinations Produced by Joining Using Pin-like Structures . Journal of Manufacturing and Materials Processing , 6 (1). https://dx.doi.org/10.3390/jmmp6010013
Wolf, M., & Drummer, D. (2022). Weld peculiarities of infrared-welded joints between laser-sintered and injection-moulded components . Joining Plastics - Fügen von Kunststoffen , 16 (3-4), 166-173.
Yuan, S., Jiang, B., Jiang, F., Drummer, D., & Zhou, M. (2022). Numerical and experimental investigation of mixing enhancement in the passive planar mixer with bent baffles . International Journal of Heat and Mass Transfer , 191 . https://dx.doi.org/10.1016/j.ijheatmasstransfer.2022.122815
Yuan, S., Jiang, B., Peng, T., Zhou, M., & Drummer, D. (2022). Investigation of efficient mixing enhancement in planar micromixers with short mixing length . Chemical Engineering and Processing , 171 . https://dx.doi.org/10.1016/j.cep.2021.108747
Zirngibl, C., Kügler, P., Popp, J., Bielak, C.R., Bobbert, M., Drummer, D.,... Schleich, B. (2022). Provision of cross-domain knowledge in mechanical joining using ontologies . Production Engineering , 16 , 327 - 338. https://dx.doi.org/10.1007/s11740-022-01117-y
2021
Deringer, T., & Drummer, D. (2021). In situ curing and bonding of epoxy prepregs in epoxy thermoset injection molding . International Journal of Advanced Manufacturing Technology . https://dx.doi.org/10.1007/s00170-021-07838-1
Drummer, D., Grützmacher, C., Kleffel, T., Lanzl, L., Rösel, U., Roth, B.,... Wittmann, L.-M. (2021). Hochgefüllte Kunststoffe: Neue Potenziale durch den Einsatz von Füllstoffen zur gezielten Eigenschaftsmodifikation . Jahresmagazin Ingenieurwissenschaften , 38-45.
Greiner, S., Jaksch, A., Cholewa, S., & Drummer, D. (2021). Development of material-adapted processing strategies for laser sintering of polyamide 12 . Advanced Industrial and Engineering Polymer Research . https://dx.doi.org/10.1016/j.aiepr.2021.05.002
Greiner, S., Jaksch, A., & Drummer, D. (2021). Materialangepasste Prozessstrategien für das Lasersintern von Kunststoffen . In Tagungsband 27. Technomer - Fachtagung über Verarbeitung und Anwendung von Polymeren . Technische Universität Chemnitz, DE.
Greiner, S., Schlicht, S., & Drummer, D. (2021). Temperaturfeldhomogenisierung durch fraktale Belichtungsstrategien im Lasersintern von Kunststoffen . In Proceedings of the 17th Rapid.Tech Conference .
Huang, Z., Wu, W., Drummer, D., Liu, C., Wang, Y., & Wang, Z. (2021). Enhanced the thermal conductivity of polydimethylsiloxane via a three-dimensional hybrid boron nitride@silver nanowires thermal network filler . Polymers , 13 (2), 1-10. https://dx.doi.org/10.3390/polym13020248
Huang, Z., Wu, W., Drummer, D., Liu, C., Wang, Y., & Wang, Z. (2021). Multi-contact hybrid thermal conductive filler Al2O3@AgNPs optimized three-dimensional thermal network for flexible thermal interface materials . Journal of Applied Polymer Science . https://dx.doi.org/10.1002/app.50889
Jaksch, A., Hesse, N., Schmidt, J., & Drummer, D. (2021). Selektives Laserstrahlschmelzen von Polyamid 12 - Einfluss von Fließhilfsmitteln auf Verarbeitbarkeit und Bauteileigenschaften . In Proceedings of the 17th Rapid.Tech Conference .
Lanzl, L., & Drummer, D. (2021). Process Behavior of Short Glass Fiber Filled Systems during Powder Bed Fusion and Its Effect on Part Dimensions . Polymers , 13 . https://dx.doi.org/10.3390/polym13183144
Liu, C., Wu, W., Drummer, D., Wang, Y., Chen, Q., Liu, X., & Schneider, K. (2021). Significantly enhanced thermal conductivity of polymer composites via establishing double-percolated expanded graphite/multi-layer graphene hybrid filler network . European Polymer Journal , 160 . https://dx.doi.org/10.1016/j.eurpolymj.2021.110768
Ott, C., & Drummer, D. (2021). Low-stress over-molding of media-tight electronics using thermoplastic foam injection molding . Polymer Engineering and Science . https://dx.doi.org/10.1002/pen.25672
Piott, F., Krämer, A., Lück, A., Hoffmann, L., Mitschang, P., & Drummer, D. (2021). Increasing the performance of continuous compression moulding by local pressure adaption . Advanced Manufacturing: Polymer and Composites Science . https://dx.doi.org/10.1080/20550340.2021.1888209
Popp, J., Kleffel, T., & Drummer, D. (2021). Influence of pin geometry on the joint strength of CFRT-metal hybrid parts with metallic pins . Joining Plastics - Fügen von Kunststoffen , 15 , 177-183.
Popp, J., Kleffel, T., Römisch, D., Papke, T., Merklein, M., & Drummer, D. (2021). Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins . Applied Composite Materials . https://dx.doi.org/10.1007/s10443-021-09892-0
Popp, J., Wolf, M., Mattner, T., & Drummer, D. (2021). Energy Direction in Ultrasonic Impregnation of Continuous Fiber-Reinforced Thermoplastics . Journal of Composites Science , 5 (9). https://dx.doi.org/10.3390/jcs5090239
Roth, B., & Drummer, D. (2021). Isotropy of mechanical properties and environmental stress crack sensitivity in injection- and injection-compression molding of polystyrene with different mold temperature . Polymer Engineering and Science , 1-10. https://dx.doi.org/10.1002/pen.25793
Roth, B., & Drummer, D. (2021). Pressure Equilibrium Time of a Cyclic-Olefin Copolymer . Polymers , 13 . https://dx.doi.org/10.3390/polym13142309
Rothfelder, R., Lanzl, L., Selzam, J.H., Drummer, D., & Schmidt, M. (2021). Vibrational Microfeeding of Polymer and Metal Powders for Locally Graded Properties in Powder-Based Additive Manufacturing . Journal of Materials Engineering and Performance . https://dx.doi.org/10.1007/s11665-021-06271-5
Römisch, D., Popp, J., Drummer, D., & Merklein, M. (2021). Joining of CFRT-steel hybrid parts via hole-forming and subsequent pin caulking . Production Engineering . https://dx.doi.org/10.1007/s11740-021-01093-9
Rösel, U., & Drummer, D. (2021). Correlation between the Flow and Curing Behavior of Hard Magnetic Fillers in Thermosets and the Magnetic Properties . Magnetism , 1 , 37-57. https://dx.doi.org/10.3390/magnetism1010004
Rösel, U., & Drummer, D. (2021). Injection Moulding of Multipolar Polymer-Bonded Magnets into Soft Magnetic Inserts for Rotors in Reluctance Motors . Magnetism , 1 , 3-21. https://dx.doi.org/10.3390/magnetism1010004
Rösel, U., Drummer, D., & Köjer, M. (2021). Fertigung eines Spritzgießwerkzeuges zur Herstellung von Flusssperren aus kunststoffgebundenen Dauermagneten in einem Synchron-Reluktanzmotor . Werkstoffe in der Fertigung , 4 .
Schneider, K., Ott, C., & Drummer, D. (2021). Simulative study of polymeric core-shell foam particles for the enlargement of the material portfolio in 3-D high-frequency welding . Polymer Engineering and Science . https://dx.doi.org/10.1002/pen.25861
Schulte-Hubbert, F., Drummer, D., & Hoffmann, L. (2021). Model Approach for Displaying Dynamic Filament Displacement during Impregnation of Continuous Fibres Based on the Theory of Similarity - Theory and Modelling . International Polymer Processing , 36 (4), 423-434. https://dx.doi.org/10.1515/ipp-2020-4020
Tomiak, F., Rathberger, K., Schoeffel, A., & Drummer, D. (2021). Expandable Graphite for Flame Retardant PA6 Applications . Polymers , 13 . https://dx.doi.org/10.3390/polym13162733
Tomiak, F., Schoeffel, A., Rathberger, K., & Drummer, D. (2021). A synergistic flame retardant system based on expandable graphite, aluminum (Diethyl-)polyphospinate and melamine polyphosphate for polyamide 6 . Polymers , 13 (16). https://dx.doi.org/10.3390/polym13162712
Wittmann, L.-M., & Drummer, D. (2021). Multilayer sheets for thermoforming non thermoformable polymers . Journal of Plastic Film & Sheeting . https://dx.doi.org/10.1177/87560879211037387
Wolf, M., & Drummer, D. (2021). Design criteria for the pin-foot ratio for joining adhesion-incompatible polymers using pin-like structures in vibration welding process . Journal of Polymer Engineering . https://dx.doi.org/10.1515/polyeng-2021-0199
2020
Deringer, T., & Drummer, D. (2020). The influence of mold temperature on thermoset in-mold forming . Journal of Polymer Engineering . https://dx.doi.org/10.1515/polyeng-2019-0322
Greiner, S., & Drummer, D. (2020). Infrared monitoring of modified hatching strategies for laser sintering of polymers . In Procedia CIRP (pp. 89-94).
Greiner, S., Jaksch, A., & Drummer, D. (2020). Understanding Cylinder Temperature Effects in Laser Beam Melting of Polymers . In Lecture Notes in Mechanical Engineering .
Heinl, M., Greiner, S., Wudy, K., Pobel, C., Rasch, M., Huber, F.,... Hausotte, T. (2020). Measuring procedures for surface evaluation of additively manufactured powder bed based polymer and metal parts . Measurement Science and Technology , 31 (9), 1-14. https://dx.doi.org/10.1088/1361-6501/ab89e2
Hertle, S., Kleffel, T., Wörz, A., & Drummer, D. (2020). Production of polymer-metal hybrids using extrusion-based additive manufacturing and electrochemically treated aluminum . Additive Manufacturing , 33 . https://dx.doi.org/10.1016/j.addma.2020.101135
Jiang, F., & Drummer, D. (2020). Curing Kinetic Analysis of Acrylate Photopolymer for Additive Manufacturing by Photo-DSC . Polymers , 12 . https://dx.doi.org/10.3390/polym12051080
Lanzl, L., Wudy, K., & Drummer, D. (2020). The effect of short glass fibers on the process behavior of polyamide 12 during selective laser beam melting . Polymer Testing . https://dx.doi.org/10.1016/j.polymertesting.2019.106313
Liu, C., Wu, W., Drummer, D., Shen, W., Wang, Y., Schneider, K., & Tomiak, F. (2020). ZnO nanowire-decorated Al2O3hybrids for improving the thermal conductivity of polymer composites . Journal of Materials Chemistry C , 8 (16), 5380-5388. https://dx.doi.org/10.1039/c9tc06805h
Mattner, T., & Drummer, D. (2020). Analysis of Contributive Forces In Intra-Laminar Shear of Continuous Fiber Reinforced Thermoplastics . In ANTEC® 2020: The Virtual Edition Proceedings .
Mattner, T., Popp, J., Kleffel, T., Gröschel, C., & Drummer, D. (2020). High Speed Forming of Continuous Fiber Reinforced Thermoplastics . Applied Composite Materials . https://dx.doi.org/10.1007/s10443-020-09794-7
Mattner, T., Wrensch, M., & Drummer, D. (2020). Shear behavior of woven and non-crimp fabric based thermoplastic composites at near-processing conditions . Composites Part B-Engineering , 185 . https://dx.doi.org/10.1016/j.compositesb.2020.107761
Müller, A., Schubert, D., Drummer, D., & Hausotte, T. (2020). Determination of the single point uncertainty of customized polymer gear wheels using structured-light scanning with various polygonization settings . Journal of Sensors and Sensor Systems , 9 (1), 51-60. https://dx.doi.org/10.5194/jsss-9-51-2020
Ott, C., Wolf, M., & Drummer, D. (2020). Media-Tight Polymer-Polymer Assemblies By Means of Sintered Powder Layer in Assembly Injection Moulding . Procedia Manufacturing , 47 , 362-367. https://dx.doi.org/10.1016/j.promfg.2020.04.286
Qiang, J., Luo, K., Dong, Y., Jiang, B., Drummer, D., & Roth, B. (2020). In Situ Stress Measurement of Ni Electrodeposition Using Lateral Shearing Interferometry . Journal of The Electrochemical Society , 167 (16). https://dx.doi.org/10.1149/1945-7111/abcb78
Roth, B., & Drummer, D. (2020). Anwendungsoptimierte Druckverfestigung . Zeitschrift Kunststofftechnik , 2020 (4), 108-132. https://dx.doi.org/10.3139/O999.01042020
Roth, B., & Drummer, D. (2020). Application optimized compression induced solidification . International Journal of Plastics Technology , 16 (4).
Roth, B., Wildner, W., & Drummer, D. (2020). Compression-Induced Solidification . Polymers , 12 . https://dx.doi.org/10.3390/polym12020488
Roth, B., Wildner, W., & Drummer, D. (2020). Dynamic compression induced solidification . Polymers , 12 (2). https://dx.doi.org/10.3390/polym12020488
Rösel, U., & Drummer, D. (2020). Einfluss von Prozessparametern auf die Eigenschaften von Rotoren . In Proceedings of the Fachtagung Leitfähige Kunststoffe des Kunststoffinstituts Lüdenscheid .
Schneider, K., Wudy, K., & Drummer, D. (2020). Flame-retardant polyamide powder for laser sintering: Powder characterization, processing behavior and component properties . Polymers , 12 (8). https://dx.doi.org/10.3390/POLYM12081697
Schubert, D., Rohrmoser, A., Hagenah, H., Merklein, M., & Drummer, D. (2020). Verschleißmodellierung am Beispiel einer Polyamid-Stahl-Getriebepaarung für das prozessorientierte Toleranzmanagement . In Sandro Wartzack (Eds.), Beiträge zur 4. Summer School (pp. 107-116). Erlangen, DE.
Soldner, D., Greiner, S., Burkhardt, C., Drummer, D., Steinmann, P., & Mergheim, J. (2020). Numerical and experimental investigation of the isothermal assumption in selective laser sintering of PA12 . Additive Manufacturing . https://dx.doi.org/10.1016/j.addma.2020.101676
Tomiak, F., Schartel, B., Wolf, M., & Drummer, D. (2020). Particle Size Related Effects of Multi-Component Flame-Retardant Systems in Poly(Butadiene Terephtalate) . Polymers , 12 (6). https://dx.doi.org/10.3390/polym12061315
Topic, N., Kruppa, S., & Drummer, D. (2020). Assistance Machine Function for BMC Injection Molding . In ADVANCES IN POLYMER PROCESSING 2020 (pp. 177-188). Aachen, DE: BERLIN: SPRINGER-VERLAG BERLIN.
Wang, L., Wu, W., & Drummer, D. (2020). Construction of micro-thermal conductive network of self-assembled CNTs hybrids with 1D–0D structure . Journal of Thermal Analysis and Calorimetry . https://dx.doi.org/10.1007/s10973-020-10291-z
Wang, Y., Wu, W., Drummer, D., Liu, C., Shen, W., Tomiak, F.,... Chen, Q. (2020). Highly thermally conductive polybenzoxazine composites based on boron nitride flakes deposited with copper particles . Materials & Design , 191 . https://dx.doi.org/10.1016/j.matdes.2020.108698
Wang, Y., Wu, W., Drummer, D., Liu, C., Tomiak, F., & Schneider, K. (2020). Improvement of thermal conductivity and mechanical properties for polybenzoxazine composites via incorporation of epoxy resin and segregated structure . Materials Research Express , 7 (9). https://dx.doi.org/10.1088/2053-1591/abb263
Wang, Y., Wu, W., Drummer, D., Liu, C., Tomiak, F., Schneider, K., & Huang, Z. (2020). Achieving a 3D thermally conductive while electrically insulating network in polybenzoxazine with a novel hybrid filler composed of boron nitride and carbon nanotubes . Polymers , 12 (10), 1-18. https://dx.doi.org/10.3390/polym12102331
Werner, J., Vetter, L., Hertle, S., Wolf, M., & Drummer, D. (2020). Air inclusions in the polymer melt functioning as intrinsic physical blowing agents for the generation of foams in rotational molding . Cellular Polymers . https://dx.doi.org/10.1177/0262489320920070
Wittmann, L.-M., Kurth, K., & Drummer, D. (2020). Elongation behaviour of filled semi-crystalline polymers in thermoforming . Advances in Materials and Processing Technologies , 6 (3), 647-660. https://dx.doi.org/10.1080/2374068X.2020.1734348
Wolf, M., & Drummer, D. (2020). Influence of the Structuring-Tool Geometry on Form-Fit Joining by Use of Pin-Like Structures in Vibration Welding . Procedia Manufacturing , 47 , 375-382. https://dx.doi.org/10.1016/j.promfg.2020.04.292
Wolf, M., & Drummer, D. (2020). Joining laser-sintered with injection-molded parts made of PA12 using infrared welding . Polymer Engineering and Science . https://dx.doi.org/10.1002/pen.25596
Wolf, M., Werner, J., & Drummer, D. (2020). Weld seam morphology and bond strength of infrared and vibration welded SLS parts of polyamide 12 as a function of the layer build-up direction and the welding process . Additive Manufacturing , 36 . https://dx.doi.org/10.1016/j.addma.2020.101451
Wudy, K., & Drummer, D. (2020). Curing behavior of thermosets for the use in a combined selective laser sintering process of polymers . In Solid Freeform Fabrication 2018: Proceedings of the 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018 (pp. 338-339). Austin, TX, US: The University of Texas at Austin.
Zhou, M., Fu, L., Jiang, F., Jiang, B., & Drummer, D. (2020). Atomistic investigation on the wetting behavior and interfacial joining of polymer-metal interface . Polymers , 12 (8). https://dx.doi.org/10.3390/POLYM12081696
Zou, Z., Wu, W., Wang, Y., & Drummer, D. (2020). Biomass derived carbon aerogel as an ultrastable skeleton of form-stable phase change materials for efficient thermal energy storage . Materials Research Express , 7 (4). https://dx.doi.org/10.1088/2053-1591/ab8584
Zou, Z., Wu, W., Wang, Y., Kern, W., & Drummer, D. (2020). Influences of Morphology Controllable Alumina on the Thermal Conductivity of Composites of Silicone Rubber 形貌可控氧化铝对硅橡胶复合材料导热性能的影响 . Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering , 36 (4), 128-134 and 141. https://dx.doi.org/10.16865/j.cnki.1000-7555.2020.0082
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Research in material development, design, and innovative processing of polymer materials. The research focus is Lightweight structures, Additive Manufacturing, Polymers in electric/electronic and medical applications, and machine elements.
Research projects
Current projects
Hochpräzise Bipolarplatten im dynamisch temperierten Spritzprägen
(Third Party Funds Single)
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
Um die dringend notwendigen Kosten- und Lebensdauervorteile der Kunststoffe im Vergleich zu metallischen Werkstoffen für die Anwendung der Bipolarplatten zu erschließen, sind hohe Füllstoffgehalte zur Erzielung ausreichend hoher elektrischer Leitfähigkeit notwendig. Derart modifizierte Thermoplastschmelzen zeigen jedoch aufgrund einer deutlich erhöhten Viskosität sowie des negativen Effekts erhöhter Schmelzewärmeleitfähigkeit ein verschlechtertes Abbildungs- und Formfüllungsverhalten. Dies resultiert in Limitationen in den möglichen Dickenabmessungen sowie der Abformung feiner Kanalstrukturen bisheriger Bipolarplattengeometrien im Spritzgussprozess. Da die Ausgangsspannung pro Zelle lediglich max. 1,23 V beträgt, sind für höhere Spannungen mehrere in Reihe geschaltete Zellen erforderlich, was bei dickeren Bipolarplatten aus Kunststoff-Compound darüber hinaus erheblich größere Bauraumvolumina und Kosten verursacht. Die daher angestrebte Reduktion der Plattendicke kann nur bedingt durch höhere Einspritzgeschwindigkeiten und Werkzeugtemperaturen im Spritzgussprozess erreicht werden, da dies aufgrund des verringerten Fließquerschnitts unabhängig von der Art der Werkzeugtemperaturführung in zu hohem Druckbedarf während der Füllung sowie inhomogenen Druck- und Temperaturfeldern über den Fließweg resultiert. Dies zeigt sich auf Bauteilebene in einer verschlechterten, fließwegabhängigen Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen. Neben Abbildungsproblemen zeigen hochgefüllte Kunststoffbauteile auch ein ausgeprägt richtungsabhängiges mechanisches und elektrisches Bauteilverhalten, welches maßgeblich von den Temperatur-Druck-Scherbedingungen im Prozess bestimmt wird. Ziel des Projekts ist daher der Erkenntnistransfer der analytischen und experimentellen Auslegung der benötigten Zeit-Temperatur-Druck-Scherbedingungen im dynamisch temperierten Spritzprägen zur Realisierung von dünnwandigen und hochgefüllten Bipolarplatten mit höchstmöglicher Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen bei gleichzeitig optimierten elektrischen und mechanischen Eigenschaften. Hierbei soll die Fließfähigkeit der Kunststoffschmelze während des Urformprozesses durch die dynamische Werkzeugtemperaturführung aufrechterhalten werden. Die Kombination dieser modernen Verfahrensstrategie mit einem Prägeprozess erlaubt die flächige Nachdruckwirkung und Realisierung hoher Plattenaspektverhältnisse bei gleichzeitig höchstmöglicher Maßhaltigkeit und Abformgenauigkeit der Kanalstrukturen über den Fließweg. Durch die Kontrolle von Temperatur und Druck sowie die indirekte Einflussnahme auf die Scherung im Prozess können die bestehenden Kenntnisse zur prozessseitigen Beeinflussung elektrischer und mechanischer Bauteileigenschaften zudem in den Fertigungsprozess des dynamisch temperierten Spritzprägens übersetzt werden, um das Werkstoffpotential optimal auszunutzen.
Recycling von Magnetwerkstoffen für die Verwendung in kunststoffgebundenen Dauermagneten
(Third Party Funds Single)
Funding source: Deutsche Bundesstiftung Umwelt
Additive Fertigung von Antennen durch die Verarbeitung hochfrequenztauglicher Kunststoffe
(Third Party Funds Single)
Funding source: Bundesministerium für Wirtschaft und Klimaschutz (BMWK)
Textile Recycling Excellence
(Third Party Funds Group – Sub project)
Term: 31. May 2022 - 31. May 2025
Funding source: Europäische Union (EU)
Less than 1 % of materials used to produce clothing is recycled into new clothing. From January 2025, a directive requires 27 Member States to implement a separate household textile waste collection scheme and comply with rising minimum recycling objectives. Legislation is not enough to deal with the issue. Creating a circular system for post-consumer textile waste faces many challenges, including a lack of EU-wide standards for collecting and sorting textile waste across countries, inaccurate composition claims, variable material quality and a lack of reliable data across value chain stakeholders. The EU-funded T-REX project aims to demonstrate how household textile waste can become a new feedstock and business model for the textile industry by engaging key actors across the entire value chain.
Keramische Schaumstoffmaterialien für erhöhte Bauteilfunktionalitäten und ressourceneffiziente Produktionsprozesse; Teilvorhaben: Erforschung von Keramikfeedstocks zur Herstellung poröser Keramikstrukturen mit Hilfe thermoplastischer Formgebungsverfahren
(Third Party Funds Single)
Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Metal Filament Modeling - Feedstocks mit Werkzeugstählen für den 3D-Druck (HiFil3D); Teilprojekt: Metal Filament Modeling - Herstellung hochgefüllter und homogener Metall-Feedstocks für den 3D-Druck
(Third Party Funds Group – Sub project)
Term: 1. August 2021 - 31. July 2024
Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Zuverlässige Folienkondensatoren mit erhöhtem Leistungspotential
(Third Party Funds Single)
Funding source: Bundesministerium für Wirtschaft und Technologie (BMWi)
Optimierte Materialien für das vakuumunterstützte Schäumen in Rotationsformen (Vacuum Assistet ROtational FOam MOlding)
(Third Party Funds Single)
Funding source: Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie (StMWi) (seit 2018)
Thermoset-bonded injection-molded magnets with defined structure of magnetization
(Third Party Funds Single)
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
Tool Additive Arm zur Fertigung ressourceneffizienter Leichtbaustrukturen im Fahrzeugbau
(Third Party Funds Single)
Funding source: Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie (StMWi) (seit 2018)
Process strategies for the production of thin-walled components during selective laser beam melting of plastics
(Third Party Funds Group – Sub project)
Term: 1. January 2021 - 31. December 2023
Funding source: DFG / Sonderforschungsbereich (SFB)
URL: https://www.crc814.research.fau.eu/projekte/t-transferprojekte/transferproject-t3/
The aim of theproject is the systematic investigation of the process-geometry-interaction ofthin-walled components for the production of locally adapted properties as wellas the modeling of this effect in finite element simulations and structuraloptimization. In experimental tests, the main influencing factors areidentified and mapped in relation to the building position in the process. Newexposure technologies and strategies are used to manipulate the melting pooland homogenize component properties. The findings are incorporated into a wallthickness dependent material model for structural optimization, which isinvestigated in the project. The participating industrial partners willvalidate the results over the course of the project. The experimental findingsand the wall thickness dependent material model will be used to develop amethodology for the product development of thin-walled structures. In thefuture, the product development process can be accelerated, and the economicefficiency increased. Based on these findings, new application areas for theselective laser beam melting of plastics can be opened up in the future.
Funktion by Desgin: Cellular Hybrids - Eine Route zur Biologisierung der Materialwissenschaften
(Third Party Funds Single)
Funding source: Bayerisches Staatsministerium für Wissenschaft und Kunst (StMWK) (seit 2018)
Joining by using pin-like structures in welding processes
(Third Party Funds Single)
Funding source: DFG-Einzelförderung / Sachbeihilfe (EIN-SBH)
Recent publications
2023
2022
2021
2020
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