@misc{SeidlitzUlkeWinterGerstenbergeretal., author = {Seidlitz, Holger and Ulke-Winter, Lars and Gerstenberger, Colin and Kroll, Lothar}, title = {Dimensioning of Punctiform Metal-Composite Joints: A Section-Force Related Failure Criterion}, series = {Open Journal of Composite Materials}, volume = {4}, journal = {Open Journal of Composite Materials}, number = {3}, issn = {2164-5655}, doi = {10.4236/ojcm.2014.43018}, pages = {157 -- 172}, abstract = {Reliable line production processes and simulation tools play a central role for the structural integration of thermoplastic composites in advanced lightweight constructions. Provided that material-adapted joining technologies are available, they can be applied in heavy-duty multi-material designs (MMD). A load-adapted approach was implemented into the new fully automatic and faulttolerant thermo mechanical flow drill joining (FDJ) concept. With this method it is possible to manufacture reproducible high strength FRP/metal-joints within short cycle times and without use of extra joining elements for the first time. The analysis of FDJ joints requires a simplified model of the joint to enable efficient numerical simulations. The present work introduces a strategy in modeling a finite-element based analogous-approach for FDJ-joints with glass fiber reinforced polypropylene and high-strength steel. Combined with a newly developed section-force related failure criterion, it is possible to predict the fundamental failure behavior in multi-axial stress states. The functionality of the holistic approach is illustrated by a demonstrator that represents a part of a car body-in-white structure. The comparison of simulated and experimentally determined failure loads proves the applicability for several combined load cases.}, language = {en} } @misc{SeidlitzUlkeWinterKroll, author = {Seidlitz, Holger and Ulke-Winter, Lars and Kroll, Lothar}, title = {New Joining Technology for Optimized Metal/Composite Assemblies}, series = {Journal of Engineering}, journal = {Journal of Engineering}, issn = {2314-4912}, doi = {doi:10.1155/2014/958501}, pages = {958501}, abstract = {The development of a new joining technology, which is used to manufacture high strength hybrid constructions with thermoplastic composites (FRP) and metals, is introduced. Similar to natural regulation effects at trees, fibers around the FRP joint become aligned along the lines of force and will not be destroyed by the joining process. This is achieved by the local utilization of the specific plastic flow properties of the FRT and metal component. Compared with usual joining methods—such as flow drill screws, blind and self-piercing rivets—noticeably higher tensile properties can be realized through the novel process management. The load-bearing capability increasing effect could be proved on hybrid joints with hot-dip galvanized steel HX420LAD and orthotropic glass—as well as carbon—fiber reinforced plastics. The results, which were determined in tensile-shear and cross-shear tests according to DIN EN ISO 14273 and DIN EN ISO 14272, are compared with holding loads of established joining techniques with similar joining point diameter and material combinations.}, language = {en} } @misc{SeidlitzUlkeWinterKroll, author = {Seidlitz, Holger and Ulke-Winter, Lars and Kroll, Lothar}, title = {Prozess- und festigkeitsoptimiertes Multi-Material-Design mit thermoplastischen Faserverbunden und Metallen}, series = {Konstruktion Zeitschrift f{\"u}r Produktentwicklung und Ingenieur-Werkstoffe}, journal = {Konstruktion Zeitschrift f{\"u}r Produktentwicklung und Ingenieur-Werkstoffe}, number = {11-12}, issn = {0720-5953}, pages = {75 -- 79}, language = {de} } @misc{KrollUlkeWinterSeidlitz, author = {Kroll, Lothar and Ulke-Winter, Lars and Seidlitz, Holger}, title = {CFRP coupling for towing and shunting trains}, series = {Plastics : the global application medium}, volume = {1}, journal = {Plastics : the global application medium}, number = {3-4}, issn = {2195-4577}, pages = {S. 7}, language = {en} } @inproceedings{SeidlitzNendelKrolletal., author = {Seidlitz, Holger and Nendel, Wolfgang and Kroll, Lothar and Ulke-Winter, Lars}, title = {Energie- und ressourceneffiziente Leichtbauf{\"u}gezange zur Herstellung von Mehrkomponentenbauteilen in Mischbauweise}, series = {Zentrales Innovationsprogramm Mittelstand (ZIM), Fachworkshop Elektromobilit{\"a}t, Berlin, 2012}, booktitle = {Zentrales Innovationsprogramm Mittelstand (ZIM), Fachworkshop Elektromobilit{\"a}t, Berlin, 2012}, pages = {14}, language = {de} } @misc{KolshornKrollSeidlitzetal., author = {Kolshorn, Kay-Uwe and Kroll, Lothar and Seidlitz, Holger and Ulke-Winter, Lars and M{\"u}ller, S. and Czech, Adam and Hoyer, K.-H. and Grothaus, R.}, title = {Erste CFK-Kupplung f{\"u}r Schienenfahrzeuge}, series = {Fachzeitschrift Lightweight Design}, journal = {Fachzeitschrift Lightweight Design}, number = {5}, issn = {1865-4819}, pages = {38 -- 43}, language = {de} } @misc{SeidlitzCzechUlkeWinteretal., author = {Seidlitz, Holger and Czech, Adam and Ulke-Winter, Lars and Kroll, Lothar}, title = {Thermomechanisches Ausformf{\"u}gen f{\"u}r thermoplastische FVK}, series = {Lightweight Design}, volume = {4}, journal = {Lightweight Design}, number = {3}, issn = {2192-8738}, doi = {10.1365/s35725-011-0027-6}, pages = {16 -- 23}, language = {de} } @misc{KrollUlkeWinterSeidlitz, author = {Kroll, Lothar and Ulke-Winter, Lars and Seidlitz, Holger}, title = {Der Trick: CFK statt Stahl}, series = {Technische Rundschau. Das Schweizer Industriemagazin}, volume = {105}, journal = {Technische Rundschau. Das Schweizer Industriemagazin}, number = {4}, issn = {1023-0823}, pages = {62 -- 63}, language = {de} } @misc{GerstenbergerSeidlitzUlkeWinteretal., author = {Gerstenberger, Colin and Seidlitz, Holger and Ulke-Winter, Lars and Kroll, Lothar}, title = {Dimensionierung thermomechanisch ausgeformter Verbindungen}, series = {Technomer 2013, 23. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren, 14. bis 15. November 2013}, journal = {Technomer 2013, 23. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren, 14. bis 15. November 2013}, editor = {Gehde, Michael and Wagenknecht, Udo and Bloß, Peter}, publisher = {Inst. f{\"u}r F{\"o}rdertechnik und Kunststoffe [u.a.]}, address = {Chemnitz}, isbn = {978-3-939382-11-9}, pages = {S. 168}, language = {de} } @incollection{SeidlitzCzechUlkeWinteretal., author = {Seidlitz, Holger and Czech, Adam and Ulke-Winter, Lars and Kroll, Lothar}, title = {Thermomechanisches Ausformf{\"u}gen f{\"u}r thermoplastische FVK}, series = {Jahrbuch lighweightdesign - JOT - adh{\"a}sion: Top-Innovationen aus dem Leichtbau, der Oberfl{\"a}chen- und Klebtechnik}, booktitle = {Jahrbuch lighweightdesign - JOT - adh{\"a}sion: Top-Innovationen aus dem Leichtbau, der Oberfl{\"a}chen- und Klebtechnik}, isbn = {978-3-658-00985-4}, pages = {3 -- 11}, language = {de} } @misc{SeidlitzKrollUlkeWinter, author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars}, title = {Heavy-Duty Lightweight Structures: Force Flux-Maintaining Spot Connections}, series = {Kunststoffe International}, volume = {2011}, journal = {Kunststoffe International}, number = {3}, issn = {1862-4243}, pages = {25 -- 28}, language = {en} } @misc{KrollSeidlitzUlkeWinter, author = {Kroll, Lothar and Seidlitz, Holger and Ulke-Winter, Lars}, title = {Herstellung hochbelasteter Leichtbaustrukturen in Mischbauweise}, series = {Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011}, journal = {Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011}, editor = {Wielage, Bernhard}, publisher = {IWW}, address = {Chemnitz}, isbn = {978-3-00-033801-4}, pages = {360 -- 365}, language = {de} } @misc{SeidlitzKrollUlkeWinter, author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars}, title = {Kraftflussgerechte Punktverbindungen - Hochbelastete Leichtbaustrukturen}, series = {Zeitschrift Kunststoffe}, volume = {101}, journal = {Zeitschrift Kunststoffe}, number = {3}, issn = {0023-5563}, pages = {50 -- 53}, language = {de} } @misc{KrollCzechSeidlitzetal., author = {Kroll, Lothar and Czech, Adam and Seidlitz, Holger and Ulke-Winter, Lars and M{\"u}ller, Sascha}, title = {Mechanisches Verhalten von CFK-Scheiben mit variabelaxialem Faserverlauf auf Basis der Tailored-Fibre-Placement-Technologie unter Bolzenbelastung}, series = {Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011}, journal = {Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz, 30.03. bis 01.04.2011}, editor = {Wielage, Bernhard}, publisher = {IWW}, address = {Chemnitz}, isbn = {978-3-00-033801-4}, pages = {585 -- 590}, language = {de} } @misc{UlkeWinterKrollSeidlitz, author = {Ulke-Winter, Lars and Kroll, Lothar and Seidlitz, Holger}, title = {Discrete optimization of laminate stacking sequence according to failure criteria}, series = {Recent Developments in Artificial Intelligence Methods, AI-METH 2009}, journal = {Recent Developments in Artificial Intelligence Methods, AI-METH 2009}, publisher = {Silesian University of Technology}, address = {Gliwice}, isbn = {83-60759-15-4}, pages = {57 -- 58}, language = {en} } @misc{SeidlitzKrollUlkeWinter, author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars}, title = {Faserverbundgerechte Krafteinleitungssysteme f{\"u}r Hochleistungskomponenten in Mischbauweise}, series = {Technomer 2009, 21. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren, Chemnitz, 2009, Plenum, Vortr{\"a}ge, Posterbeitr{\"a}ge, Kurzfassungen}, journal = {Technomer 2009, 21. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren, Chemnitz, 2009, Plenum, Vortr{\"a}ge, Posterbeitr{\"a}ge, Kurzfassungen}, editor = {Gehde, Michael and Wagenknecht, Udo and Bloß, Peter}, publisher = {Institut f{\"u}r Allgemeinen Maschinenbau und Kunststofftechnik, Techn. Univ. [u.a.]}, address = {Chemnitz}, isbn = {978-3-939382-09-6}, pages = {S. 55}, language = {de} } @misc{SeidlitzKrollUlkeWinteretal., author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars and Schumann, Tilo}, title = {Krafteinleitungssysteme bei hybriden Hochleistungskomponenten}, series = {Innovation mit textilen Strukturen, 12. Chemnitzer Textiltechnik-Tagung, 30. September und 1. Oktober 2009}, journal = {Innovation mit textilen Strukturen, 12. Chemnitzer Textiltechnik-Tagung, 30. September und 1. Oktober 2009}, editor = {Meynerts, Peter}, publisher = {Institut f{\"u}r Allgemeinen Maschinenbau und Kunststofftechnik [u.a.]}, address = {Chemnitz}, isbn = {978-3-9812554-3-0}, pages = {220 -- 230}, language = {de} } @misc{SeidlitzKrollUlkeWinter, author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars}, title = {Kraftflussgerechte Verbindungstechniken f{\"u}r Hochleistungskomponenten in Mischbauweise}, series = {Leichtbau-Kongress, Salzburg, 23. - 25. Juni 2009, EuroLITE, Internationale Fachmesse f{\"u}r Leichtbaukonstruktion}, journal = {Leichtbau-Kongress, Salzburg, 23. - 25. Juni 2009, EuroLITE, Internationale Fachmesse f{\"u}r Leichtbaukonstruktion}, publisher = {Hochschule}, address = {Landshut}, language = {de} } @misc{SeidlitzKrollUlkeWinter, author = {Seidlitz, Holger and Kroll, Lothar and Ulke-Winter, Lars}, title = {Load adjusted joining technology for Composite-Metal Hybrids}, series = {Recent Developments in Artificial Intelligence Methods, AI-METH 2009}, journal = {Recent Developments in Artificial Intelligence Methods, AI-METH 2009}, publisher = {Silesian University of Technology}, address = {Gliwice}, isbn = {83-60759-15-4}, doi = {10.1155/2014/958501}, pages = {51 -- 52}, language = {en} } @incollection{SeidlitzUlkeWinterKukeetal., author = {Seidlitz, Holger and Ulke-Winter, Lars and Kuke, Felix and Ost, Lucas}, title = {Material and Load Path Appropriate Joining Techniques for FRP/Metal Hybrid Structures}, series = {Welding - Materials, Fabrication Processes, and Industry 5.0}, booktitle = {Welding - Materials, Fabrication Processes, and Industry 5.0}, editor = {Kumar, Sanjeev}, edition = {1. Auflage}, publisher = {IntechOpen}, address = {London}, isbn = {978-1-83769-870-7}, doi = {10.5772/intechopen.1002239}, abstract = {Fiber-reinforced plastics (FRP) offer great lightweight construction potential. However, the anisotropic high-performance materials can only be fully utilized through the development of material-specific joining processes. A literature study shows that conventional methods such as screwing, riveting and bolting are unsuitable, since the load-bearing fibers are severed in the joining region. This leads to high-stress concentrations. To reduce these, a method is presented in which through holes are created in thermoplastic FRP by reorienting the fibers in this area around the point of disruption in accordance with the load path. For this purpose, the polymer matrix is softened locally by applying heat and penetrated with a needle or mandrel. Based on this, a technology for material-specific joining of FRP and metals has been developed in the form of thermomechanical flow drill joining. In this process, a mandrel forms a bush from the metal component and deflects the fibers of the locally softened organic sheet to suit the material. Cold metal transfer (CMT) pin welding is presented as another fully automatable joining process. In this method, the softened plastic component is penetrated with the welding wire, displacing the fibers in the joining area and realigning them to suit the load path.}, language = {en} } @misc{RueppelDornKukeetal., author = {R{\"u}ppel, Gernot Wilhelm and Dorn, Oliver Niklas and Kuke, Felix and Ulke-Winter, Lars and Seidlitz, Holger}, title = {Optical tape detection using an IR camera to create a digital twin of rotationally symmetrical wet-wound FRP components}, series = {Journal of Engineering 360}, volume = {1 (2024)}, journal = {Journal of Engineering 360}, number = {1/24}, publisher = {Index Copernicus}, issn = {3071-7507}, doi = {10.5604/01.3001.0054.8851}, pages = {46 -- 57}, abstract = {Wet-winding is used to manufacture rotationally symmetrical components such as pipes and pressure vessels, as well as non-rotationally symmetrical components like T-connectors. During this process, a resin-impregnated fiber (e.g., glass or carbon fiber) is wound around a core. The winding pattern influences the mechanical properties, including stiffness and strength of the component, and is optimized based on the expected loads. In practice, however, factors such as tape tension and resin content can cause deviations from the predefined winding pattern. This paper proposes a measuring system utilizing an IR-camera to record the winding pattern during production. The collected data is processed and converted into a digital twin for further analysis.}, language = {en} } @misc{OstSeidlitzUlkeWinteretal., author = {Ost, Lucas and Seidlitz, Holger and Ulke-Winter, Lars and Kuke, Felix}, title = {Development of a spherical high-pressure tank for hydrogen storage in mobile and stationary applications}, series = {Energy Technology}, journal = {Energy Technology}, publisher = {Wiley}, issn = {2194-4288}, doi = {10.1002/ente.202300942}, pages = {5}, abstract = {In the sub-project Mukran of the BMBF-funded flagship project TransHyDE, spherical and nearly spherical-shaped (isotensoids with short cylindrical spacer) high-pressure tanks are developed for hydrogen storage. This article presents the planned work of the Chair of Polymer-based Lightweight Design at the BTU Cottbus-Senftenberg and the research division PYCO at the Fraunhofer IAP. The research topics include the fiber-compatible design of the liners, the rule-based optimization of the layer structure of the load-bearing overwrap made of carbon fiber-reinforced plastic, the development of a fiber placement strategy, and the integration of the tanks into a frame as a mobile storage solution.}, language = {en} } @misc{KepirSeidlitzUlkeWinteretal., author = {Kepir, Yusuf and Seidlitz, Holger and Ulke-Winter, Lars and Felix, Kuke}, title = {Lightweight heat exchanger design using graphene-reinforced ceramics : a comparative study of dimensional and material effects}, series = {Proceedings of the 4th International Online Conference on Materials, 3-6 November 2025}, journal = {Proceedings of the 4th International Online Conference on Materials, 3-6 November 2025}, publisher = {MDPI}, address = {Basel}, abstract = {In high-temperature environments, heat exchangers require lightweight designs, high thermal resistance, and high effectiveness. Graphene-reinforced ceramic matrix composites (G-CMC) offer promising thermal properties for such applications. This study investigates the effectiveness changes of a block-type heat exchanger made of G-CMC, depending on the length and design, leveraging the potential of 3D printing in the production of complex geometries.}, language = {en} } @misc{KepirSeidlitzUlkeWinteretal., author = {Kepir, Yusuf and Seidlitz, Holger and Ulke-Winter, Lars and Kuke, Felix}, title = {Geometric optimization and advanced material integration for enhanced thermal performance of compact cross-flow heat exchangers in high-temperature applications}, series = {Proceedings of the 6th International Electronic Conference on Applied Sciences, 9-11 December 2025}, journal = {Proceedings of the 6th International Electronic Conference on Applied Sciences, 9-11 December 2025}, publisher = {MDPI}, address = {Basel}, abstract = {Heat exchangers used in high-temperature environments require lightweight designs with high thermal resistance and efficiency. This study numerically investigates the thermal performance of a multi-channel compact cross-flow heat exchanger, focusing on geometric configurations and material selection.}, language = {en} }